Entries |
Document | Title | Date |
20080205672 | SEMICONDUCTOR INTEGRATED CIRCUIT AND AMPLIFIER FOR SUPPRESSING POP SOUND WHILE MINIMIZING VOLTAGE TRANSITION SETTLING TIME - A semiconductor integrated circuit includes a capacitor element which defines a prescribed decay time constant with one or more resistors, an MOS transistor connected to the capacitor element via its gate, and a constant current generating element which generates a constant current. The capacitor element is charged with the constant current so as to create a linearly changing voltage. The linearly changing voltage is applied to the gate so that the MOS transistor can accordingly output a smoothly changing current. | 08-28-2008 |
20080212804 | Sound receiver - In a sound receiver, a sound wave is directly received by microphones at a predetermined phase difference. The microphones are arranged in opening cavities of a casing, at positions that are different from the volume center points of the opening cavities. The microphones are supported by supporting springs in a state of not closely contacting inner peripheral walls. The sound wave received by the microphones is input to a signal processing unit and after a signal component in a predetermined low frequency band is removed by a filter, the resulting sound wave is amplified by an amplifier and is made in phase by a phase shifter and output. | 09-04-2008 |
20080219479 | Audio Output Circuit and Audio Output Method - An audio output circuit including an input-signal generation block generating an input signal obtained by integrating a cyclic waveform and inputting the input signal to an audio amplifier at a transition from a normal operation to a power down state or at a return from the power down state to the normal operation, wherein an amplifier output terminal of the audio amplifier and an audio output unit are coupled via a capacitor. | 09-11-2008 |
20080226100 | Microphone Amplification Arrangement and Integrated Circuit Therefor - A microphone amplifier arrangement comprises at least one microphone input connected to a dual output microphone pre-amplifier having an input resistance comprising a first resistance and a second resistance in a first voltage-to-voltage mode of operation, and only the second resistance in a second current-to-voltage mode of operation. A first output is operably coupled to a first feedback path comprising a V2V feedback resistor; and a second output is operably coupled to a second feedback path comprising an I2V feedback resistor. In this manner, the microphone amplifier arrangement is arranged to support both a V2V microphone amplifier and a low-noise I2V microphone amplifier. | 09-18-2008 |
20080232614 | SOUND AMPLIFIER WITH SPEAKER - An instrument amplifier includes an amplifier circuit for amplifying a sound signal input from an electric guitar. A main speaker emits sound according to the sound signal being amplified. A CD player plays back an audio signal from an audio CD. Side speakers for playback emits audio sound according to the audio signal being played back. A speaker box contains the main speaker and the side speakers in one space. In one embodiment, the speaker box includes a rear panel for closing a space behind the main speaker and the side speakers. Furthermore, an output mode key is settable in a first mode by external operation, the first mode being for controlling the playback speaker to emit sound according to the sound signal. The side speakers are disposed beside one another, for stereo sound emission of the audio sound. | 09-25-2008 |
20080240468 | LANDSCAPE SPEAKER CONNECTOR AND SOUND SYSTEM - This application relates to an outdoor music and sound system. More particularly, this system incorporates unique weatherproof wing nut cable connectors used in connecting a plurality of weatherproof speakers on a single electrical line to a remote sound system that may be employed in a variety of landscape areas. By using 8 ohm, at 20 to 50 watt resistor units, or a 1.5 to 2 ohm receiver amplifier, to control the output, a single cable can be used to connect to a plurality of speakers. Two or more cables may be connected to the electronics unit. This inexpensive system can easily be sold at discount hardware stores in conjunction with the wide variety of inexpensive outdoor lighting systems now available. | 10-02-2008 |
20080240469 | Flat-panel television and audio equipment - Disclosed is an audio equipment, comprising: an audio output amplifier and a speaker, with a sound output from the speaker based on an audio signal that is input in the audio output amplifier, and with a high signal output as an error signal to protect the audio output amplifier when an abnormal operation occurs. The audio equipment further comprising a rectifier circuit to stabilize the error signal. | 10-02-2008 |
20080267428 | Digital audio horn - A device for producing sound amplification having a control module operably associated with a digital sound device, and an amplifier connected to and supporting the digital sound device. The control module provides at least one input signal to the digital sound device, and the digital sound device receives an input signal from the control module, causing the digital sound device to produce a vibration, and causing the amplifier to increase the magnitude of the vibration. | 10-30-2008 |
20080267429 | Modular Speaker System - A modular speaker system includes a base assembly having a longitudinally extending, central support member and a support leg extending therefrom in a manner supporting the central support member in a generally upright configuration. The central support member includes a first end and a second end. A first woofer is secured to the base assembly, and a base assembly amplifier is mounted within the central support member and connected to the first woofer. An auxiliary speaker assembly includes a longitudinally extending, auxiliary support member having a first end a second end, the first end being shaped and dimensioned for selective engagement with the second end of the central support member. A first driver is secured to the auxiliary speaker assembly and an amplifier is mounted within the auxiliary support member and is connected to the first driver. | 10-30-2008 |
20080279399 | Power Control Apparatus, Speaker Apparatus and Power Control Method - The speaker apparatus according to the invention is arranged in a manner that when the magnitude of an audio signal Sin increases temporarily and so a consumption power increases, a DC-DC converter reduces an output voltage Vout to thereby increase an output current Iout and further discharges a capacitor to thereby increase a current supplied to an amplifier. Thus, a power of 2.5 W or more supplied from a USB connection terminal can be temporarily supplied to the amplifier. Further, since the change of the voltage difference between the both ends of the capacitor can be made large, an amount of the electric charges discharged from the capacitor can be made large and so the size of the capacitor can be reduced | 11-13-2008 |
20080292116 | MULTI-MODE AUDIO AMPLIFIERS - A multimode audio amplifier comprises: a mode controller adapted to provide a control signal; and at least one multimode module, wherein each of the multimode modules has a plurality of operating modes, wherein the operating modes are selected in accordance with the control signal, wherein changing the operating modes results in a measurable change in at least one characteristic of the multimode audio amplifier; wherein the characteristics of the multimode audio amplifier consist of signal to noise ratio (SNR); total harmonic distortion and noise (THD+N); input to output delay; power consumption; and efficiency. | 11-27-2008 |
20080298608 | Sound Generating Device with Removable Memory - A sound generating device for transforming an object into a loudspeaker is includes an exciter module adapted for receiving audio signals stored on a portable micro-memory card or the like and a mounting device connected to the exciter module for removably connecting the exciter module to an object such that the object is transformed into a loudspeaker when the exciter module is energized by the audio signals. | 12-04-2008 |
20080310653 | Digital audio signal amplifier - A digital audio signal amplifier includes: a digital signal amplifying module having a digital audio signal plug connected with a digital audio signal outlet of a main board to receive digital audio signals, the digital signal amplifying module processing the digital audio signals to generate high power analog audio signals; and an analog signal output interface coupled to the digital signal amplifying module and transferring the high power analog audio signals to a set of speaker. | 12-18-2008 |
20080310654 | Circuit for processing sound signals - A circuit for processing sound signals includes an input amplifier for amplifying an input signal, wherein the amplified input signal is supplied to an output amplifier unchanged via a primary path configured as a bypass line and processed via one or several secondary paths configured as a circuit for processing the amplified input signal for amplifying and outputting the processed signal, wherein respective signal portions of the amplified input signal, which are supplied to the output amplifier via the primary path and the secondary path(s), can each be adjusted with an adjusting device, and wherein the secondary path includes a corresponding equalizing filter for filtering a corresponding frequency range with a dynamic circuit for optionally dynamically changing frequency, amplitude and phase depending on the signal and concurrent with a static control. | 12-18-2008 |
20080317263 | Voice amplification system for signal calling during the play of a sports competition - A system that allows the teammates of an individual (such as a quarterback on a football team) to hear signals being called by that individual during the course of a sports competition, despite noise generated by an audience. The system includes a microphone positioned within the helmet of the signal caller connected to an audio amplification device, either positioned in the helmet or in some other part of the clothing or equipment worn by the signal caller. The amplified signal is then directed to one or more loudspeakers, again positioned either on the helmet of the signal caller or on the clothing or equipment worn by the signal caller. The loudspeakers are directed to the signal caller's teammates, positioned typically along a line of scrimmage. The system may be time-limited in operation in that the signal caller must specifically activate the system which thereafter remains activated only for a pre-set period of time before automatically shutting off. The components of the system may be connected to each other by wired or wireless signal lines. | 12-25-2008 |
20090010457 | AUDIO SIGNAL AMPLIFYING CIRCUIT AND ELECTRONIC DEVICE USING THE SAME - In an audio signal amplifying circuit, a main amplifier and a sub amplifier amplify an audio signal. The sub amplifier is disposed in parallel with the main amplifier and also is set to have a lower driving capability than the main amplifier. A control unit controls the on and off of the main amplifier. The control unit turns the main amplifier off when it is determined that the audio signal is in a mute state. An audio signal amplified by the main amplifier and the sub amplifier passes through a low-pass filter to be converted into an analog signal and is output to a speaker. | 01-08-2009 |
20090016549 | POWER SUPPLY FOR LIMITED POWER SOURCES AND AUDIO AMPLIFIER USING POWER SUPPLY - A power supply for limited power sources and an audio amplifier using the power supply comprising power sources to provide an output power signal that can be used by load with a high peak to average power requirement ratio. When such power sources are used to power devices that have a high peak to average power consumption, the average power output of the device is severely limited if the peak power is kept below the power supply limits of the limited power source. | 01-15-2009 |
20090034757 | SERIALIZER FOR MULTIPLE APPLICATIONS - A serializer/deserializer interfaces a microprocessor/controller with I/O devices over a flexible hinging cable. The I/O devices have parallel interfaces as does the controller but the serializer/deserializer reduces the number of signal that traverse the flexible hinging cable. LCD displays, cameras, keypads and audio signals handled by the invention. | 02-05-2009 |
20090041268 | Signal Amplifying Apparatus, Amplification System, and Signal Amplification Method - An amplification system of the invention can decrease power consumption in a power amplification section if the power amplification section need not be used. The power consumption in the power amplification section can be decreased by shutting off power feed into a voltage amplification stage by a power control section, and the power feed state into a power amplification stage from a power supply section is not changed. Thus, power feed into the voltage amplification stage of the circuit wherein a large current does not flow needs only to be controlled using limiter means also used for a different application, so that the power consumption of the power amplification section can be decreased without the need for enlarging the circuit scale, with saved space, and simply. | 02-12-2009 |
20090060228 | Systems and Methods for Shadowing an HDA Codec - Systems and methods for “shadowing” a target codec to provide additional features that are not available in the target codec. In one embodiment, an audio amplification system includes a High Definition Audio (HDA) bus, and an HDA controller, a conventional HDA codec and a shadow HDA codec coupled to the HDA bus. The conventional codec receives audio data and commands from the HDA controller via the bus and processes them to generate an output audio signal. The shadow codec snoops the audio data and commands on the HDA bus that are targeted to the conventional codec. The shadow codec processes the snooped audio data and commands to generate a second audio output. The shadow codec does not communicate with the HDA controller and is transparent to the controller. The shadow codec does not request enumeration from the HDA controller and does not receive an address from the HDA controller. | 03-05-2009 |
20090060229 | WIRELESS SYSTEM FOR SHARING AUDIO SIGNAL - An audio system includes an audio enabled device, a transmitter and at least one receiver. The audio enabled device has a school and office product and an amplifier integrated with the school and office product. The audio enabled device is configured such that when the amplifier receives an electronic audio signal the amplifier and the school and office product cooperate to provide an audible audio output. The transmitter is connectable to the amplifier and configured to wirelessly transmit the electronic audio signal. Each receiver is connectable to the input port of an amplifier, and each such receiver is configured to receive the electronic audio signal transmitted by the transmitter. | 03-05-2009 |
20090074210 | Audio signal processing apparatus - An audio signal processing apparatus is provided. The audio signal processing apparatus comprises a clock generator, a processing module, an amplifying module and an output module. The clock generator is used for generating a clock signal. The processing module is coupled to the clock generator for processing the clock signal and generating a processing signal. The amplifying module is coupled to the processing module for amplifying the processing signal and generating an amplifying signal. The output module is coupled to the amplifying module for outputting the amplifying signal. | 03-19-2009 |
20090080678 | SPEAKER DEVICE OF MOBILE COMMUNICATION TERMINAL FOR OUTPUTTING HIGH QUALITY SOUND - A speaker device employing a diaphragm structure for providing high quality sound characteristics. In particular, a separate speaker unit is additionally provided so as to improve a resonator characteristic produced at the rear side of an existing speaker. As such, the rear sound arriving at an end of the resonator is dampened by the sound outputted from the additional speaker unit, thereby improving characteristics, such as clearness, total harmonic distortion, etc. | 03-26-2009 |
20090092267 | SWITCHING AUDIO POWER AMPLIFIER WITH DE-NOISE FUNCTION - The invention provides a switching audio power amplifier with de-noise function, including a first comparator, a second comparator, a logic control unit, a de-noise circuit, and a bridge circuit. The first comparator and the second comparator respectively generate the first PWM signal and the second PWM signal, and then the logic control unit performs logic operation to generate a third PWM signal and a fourth PWM signal. If the pulse width of the third PWM signal (or the fourth PWM signal) is lower than a threshold, the de-noise circuit increases the pulse width of the third PWM signal or the fourth PWM signal and outputs the fifth PWM signal and the sixth PWM signal to drive the bridge circuit. Next, the bridge circuit conducts a driving current alternately flowing to and from a load according to the firth PWM signal and the sixth PWM signal. | 04-09-2009 |
20090110216 | Wireless acoustic speaker mount - A Wireless Acoustic SPeaker mount, or WASP, is disclosed that serves as both a wireless speaker adapter and a speaker mount. Some embodiments include a separate transmitter that obtains wired acoustic signals from an acoustic source and transmits them wirelessly to the WASP. WASP's can include a digital and/or analog wireless receiver, digital-to-analog converter, amplifier, and/or equalizer or other sound quality adjuster. WASP's can rest on a horizontal surface or be mounted to or embedded within a wall, ceiling, or other structure. Speakers can rest on or attach to a WASP or be mounted inside of a WASP. In various embodiments the horizontal and/or vertical positioning of the speaker is adjustable, WASP's can be used outdoors, WASP's can extend a wireless transmission range by relaying signals to other WASP's, and the transmitter and WASP's can send on/off and other command signals to each other. | 04-30-2009 |
20090110217 | Digital/Analogue conversion apparatus - A digital/analog conversion apparatus for converting a digital signal into an analog signal. The digital/analog conversion apparatus can generate a high-quality analog signal, even when elements configuring the digital/analog conversion apparatus have variance, with high resolution and a small circuit size. The data conversion apparatus is provided with a first data converter for reducing the number of bits of an input signal, a second data converter for converting the format of the first output signal, and a third data converter for conversion into a code which corresponds to the history of the output from the second data converter. | 04-30-2009 |
20090141911 | ACOUSTIC PROCESSING DEVICE AND ACOUSTIC PROCESSING METHOD - An acoustic processing device, includes an inputting section which receives a first audio signal and a second audio signal, a first input signal amplifying section which amplifies the first audio signal at an amplification factor, a second input signal amplifying section which amplifies the second audio signal at an amplification factor, a first initial delayed amplifying section, a first adding section which adds the first audio signal amplified by the first amplifying portion and the first audio signal amplified by the first input signal amplifying section, a second adding section which adds the first audio signal amplified by the second amplifying portion and the second audio signal amplified by the second input signal amplifying section, a first supplying section which supplies an audio signal output from the first adding section to a first sound emitting section, and a second supplying section which supplies an audio signal output from the second adding section to a second sound emitting section different from the first sound emitting section. | 06-04-2009 |
20090154731 | AUDIO PLAYBACK APPARATUS - An audio playback apparatus is disclosed. The audio playback apparatus processes an audio signal and provides at least one output signal to at least one speaker or an earphone connected to a phone-jack. The audio playback apparatus comprises a clock generating module, a processing module, an amplifier module, and a detecting module. The processing module is connected to the clock generating module and processes the audio signal to generate a processed signal according to a clock signal generated by the clock generating module. The amplifier module amplifies the processed signal to generate an output signal. The detecting module detects whether the earphone is plugged in the phone-jack. If the earphone is plugged in the phone-jack, the amplifier module provides the output signal to the earphone. If not, the amplifier module provides the output signal to the speaker. | 06-18-2009 |
20090154732 | AUDIO PLAYING MODULE AND METHOD OF THE SAME - An audio module used for a display device is disclosed. The display device has a display substrate. The audio module has a filter, an amplifier, and at least one output unit. The filter receives and filters an audio signal to generate a filtered signal. The amplifier is coupled to the filter and amplifies the filtered signal to generate an amplified signal. At least one output unit is coupled to the amplifier and plays the amplified signal in a predetermined way. | 06-18-2009 |
20090154733 | AMPLIFIER CIRCUIT AND METHODS OF OPERATION THEREOF - A signal amplifying circuit and associated methods and apparatuses, the circuit comprising: a signal path extending from an input terminal to an output terminal, a gain controller arranged to control the gain applied along the signal path in response to a control signal; an output stage within the signal path for generating the output signal, the output stage having a gain that is substantially independent of its supply voltage, and a variable voltage power supply comprising a charge pump for providing positive and negative output voltages, the charge pump comprising a network of switches that is operable in a number of different states and a controller for operating the switches in a sequence of the states so as to generate positive and negative output voltages together spanning a voltage approximately equal to the input voltage. | 06-18-2009 |
20090180644 | Integrated and programmable microphone bias generation - A disclosed embodiment is a programmable integrated circuit such as an audio processor or a base band processor for generating a low noise and programmable microphone bias voltage or current. The programmable integrated circuit generates a programmable reference input, where the reference input is programmably generated from at least one power source, such as a on-chip audio power supply, an on-chip power supply, or an off-chip power supply, for use by a regulator. The regulator in the programmable integrated circuit receives a bias input and the programmable reference input and generates a programmable output for biasing a microphone. The bias input for the regulator can be provided by an off-chip power supply or an on-chip power supply. The reference input provided to the regulator can be appropriately filtered to reduce noise. In one embodiment, the programmable reference input and the programmable output are programmed by first and second potentiometers, respectively. | 07-16-2009 |
20090185696 | SOUND SIGNAL TRANSMITTER-RECEIVER - A sound signal transmitter-receiver includes a differential microphone for receiving sounds respectively at first and second points to convert the receiving sounds into a transmission sound signal; a transmission-reception unit for receiving an incoming signal as a reception sound signal; an addition unit for adding the reception sound signal from the transmission-reception unit and the transmission sound signal to produce an addition signal; and a speaker outputting sound based on the addition signal. | 07-23-2009 |
20090196439 | ARTICULATED AMPLIFIER - An audio amplifier having a variably configurable housing, which may be mounted to an interior surface of a motor vehicle. The housing is formed in two complementing housing sections mutually joined by a hinge, tether, or other connector. A power supply is contained in one housing section and an audio output module is contained in the other housing section. The power supply and audio output module may be connected by flexible signal conductors to accommodate pivot of the two housing sections relative to one another. A heat sink comprising cooling fins and communications and power terminals may be disposed on the exterior of the housing sections to enable conventional connection to an associated audio system. The hinge may incorporate a fixing element which releasably holds the two housing sections at a selected degree of pivot. | 08-06-2009 |
20090202087 | Wireless Microphone Device - To provide a wireless microphone device that enables a circuit board, which is to be provided with an oscillation circuit, to be decreased in size without deteriorating radiation characteristics. | 08-13-2009 |
20090208036 | MAGNETIC ALERT DETECTOR - A tone alert amplifier includes a pickup coil, a filter unit, a converting unit, a micro-control unit, an amplifier, and a loud speaker unit. The pickup coil senses a magnetic signal to induce an input signal, and the filter unit performs a specific filtering operation upon the input signal to generate a filtered input signal. Next, the converting unit converts the filtered input signal into the digital signal, and the micro-control unit receives the digital signal to generate at least one output signal. Then the amplifier amplifies the output signal to generate an audio signal, and finally, the speaker unit outputs the audio signal. | 08-20-2009 |
20090220110 | SYSTEM AND METHOD OF REDUCING POWER CONSUMPTION FOR AUDIO PLAYBACK - A system and method of improving the efficiency in the power consumption of an audio system. In essence, the technique is to adjust the power delivered from the power supply to the analog section, such as the power amplifier, in response to the volume level indicated by the volume control module and/or in response to the detected characteristic of the input audio signal. Thus, in this manner, the analog section is operated in a manner that is related to the level of the signal it is processing. Additionally, the system and method also relate to a technique of adjusting the dynamic ranges of the digital signal and the analog signal to improve the overall dynamic range of the system without needing to consume additional power. | 09-03-2009 |
20090232331 | AMPLIFIER CONTROLLER - An amplifier controller for controlling a plurality of amplifiers connected therewith is provided. Each of said amplifiers is provided with one or more audio output channels. The amplifier controller operates in two modes of solo mode and normal mode. When the solo mode is initiated, the amplifier controller instructs all of the amplifiers to turn off output of all audio output channels provided in the amplifiers, and only in the solo mode, according to selection of an output channel for which solo output is to be performed, the amplifier controller instructs the amplifier provided with the selected channel to turn on output of the channel, and instructs each of the amplifiers provided with an audio output channel other than the selected channel to turn off output of the audio output channel. | 09-17-2009 |
20090238382 | AUDIO REPRODUCTION SYSTEM - The audio reproduction system amplifies and reproduces both a digital audio signal and an analog audio signal. After delta sigma modulation by a ΔΣ modulator, the digital audio signal is pulse width modulated by a first PWM converter and supplied to a selector. The analog audio signal is compared with a PWM carrier signal by a second PWM converter, converted to a PWM signal, and supplied to the selector. A signal selected by the selector is then amplified by a class D amplifier. | 09-24-2009 |
20090245540 | AMPLIFICATION CIRCUIT AND METHOD THEREFOR - In one embodiment, an amplification circuit receives an analog signal and adds another signal to the analog signal to modify the minimum amplitude of the analog input signal. | 10-01-2009 |
20090285416 | Speaker Driver Circuit Driven By Postive and Negative Voltages - A speaker driver circuit driven by positive and negative voltages, comprising: at least one operational amplifier providing an output to a headphone speaker, and a voltage converter receiving a supplied voltage (VDD), generating r-fold positive and negative voltages (r·VDD and −r·VDD, wherein r is any positive real number except 1) according to the supplied voltage, and supplying the positive and negative voltages to the operational amplifier for its high and low operation voltage levels respectively. | 11-19-2009 |
20100014694 | Audio Amplifier - The embodiments described herein relate to amplifier circuits with power rails. The power rails are generated in response to an input signal, which will typically be an audio signal, and with a sufficient magnitude to power the amplifier and to generate an output signal corresponding to the input signal. | 01-21-2010 |
20100027813 | SWITCHING AUDIO AMPLIFIER, DIGITAL SPEAKING DEVICE AND AUDIO AMPLIFICATION METHOD - A switching audio amplifier adapted in a digital speaking device for driving a speaker is provided. An audio amplification method implemented for the switching audio amplifier is also provided. In the switching audio amplifier, a comparison stage compares an audio input signal with a saw-tooth signal to generate a Pulse Width Modulation (PWM) signal. A driver stage buffers the PWM signal to drive the speaker. A detector detects amplitude of the input signal to generate a control signal, and a saw-tooth generator adjusts a transition rate of the saw-tooth signal based on the control signal. | 02-04-2010 |
20100034401 | AUDIO PLAYER WITH ILLUMINATION EFFECT - An audio player with illumination effect has an audio play host and a lighting box. The audio play host has a housing in which speakers, a circuit board and a power amplifiers are mounted. The housing further has audio signal connectors, buttons and a display and is defined with at least one mounting hole. The lighting box is mounted on the audio play host and has a casing, at least one lamp socket and at least one lamp. The lamp socket with two ends respectively extends into the housing and the casing to electrically connect the circuit board and hold the lamp. In addition to amplify and output an audio signal from the audio signal connectors, the control circuit determines on and off operations and illuminating intensity of the lighting box. | 02-11-2010 |
20100054500 | AUDIO DEVICE AND AUDIO INPUT/OUTPUT METHOD - An audio device and an audio input/output method are described, which is coupled to an audio port, and includes a capacitor, a load, an output amplifying module, and an input amplifying module. The capacitor and the load are coupled to the audio port. The output amplifying module is operated at a first working voltage, for outputting a first audio signal to the audio port. A direct current (DC) level of the first audio signal is substantially zero volts. The input amplifying module is operated at a second working voltage, in order to receive a second audio signal from the audio port. When the audio port is in an output state, the output amplifying module is enabled and the input amplifying module is disabled, and when the audio port is in an input state, the input amplifying module is enabled and the output amplifying module is disabled. | 03-04-2010 |
20100074457 | SOUND REPRODUCING SYSTEM WITH SUPERIMPOSED DIGITAL SIGNAL - The invention provides a Hi-fi sound system for the digital transfer of sound information from a digital signal source ( | 03-25-2010 |
20100092009 | AUDIO OUTPUT DEVICE - An amplification circuit amplifies an input signal. A signal detecting circuit detects whether the input signal is in a signal present state or in a signal absent state. A period detecting circuit detects a signal present duration for which the signal detecting circuit detects that the input signal is in the signal present state. A time setting circuit sets a control waiting time, depending on the signal present duration detected by the period detecting circuit. A control circuit limits outputting of the amplification circuit after the control waiting time set by the time setting circuit has elapsed since the signal detecting circuit detected the signal absent state of the input signal. | 04-15-2010 |
20100092010 | METHOD AND ELECTRONIC DEVICE FOR DRIVING A CAPACITANCE ELECTRO-ACOUSTIC TRANSDUCER - An electronic device includes a capacitance electro-acoustic transducer and an audio driver. The audio driver is coupled to the capacitance electro-acoustic transducer. The audio driver includes a high-voltage amplifier for receiving an input audio signal and for transforming the input audio signal into an output audio signal to drive the capacitance electro-acoustic transducer, wherein an absolute voltage value of the input audio signal is smaller than an absolute voltage value of the output audio signal. The output bandwidth of the capacitance electro-acoustic transducer is controlled by the magnitude of the output current of the audio driver. The capacitance electro-acoustic transducer of the present invention can meet different bandwidth requirements and thus achieve saving power, which cannot be achieved by a traditional dynamic electro-acoustic transducer. | 04-15-2010 |
20100098268 | HIGH-VOLTAGE OUTPUT AMPLIFIER FOR AUDIO SYSTEMS - An amplifier circuit having low-voltage transistors and being configured to operate at a high voltage level is provided. The amplifier circuit includes a driver circuit having a first stage and a second stage connected in series between a power supply and a ground. The driver circuit has a control terminal for receiving a signal for controlling a current flow in the output driver. The amplifier circuit also includes a switch transistor having a drain connected to the power supply, a source connected to the control terminal of the output driver, and a gate. A bias circuit is coupled to the switch transistor. In a first mode of operation, the bias circuit is adapted to turn off the switch transistor, and, in a second mode of operation, the bias circuit is adapted to turn on the switch transistor. The bias circuit is adapted to maintain a gate-to-drain voltage of the switch transistor within a predetermined voltage range. | 04-22-2010 |
20100158278 | Power Management Controller for Drivers - A driver controller comprising a state machine for controlling transitions between a plurality of states. An output switch for providing a low impedance path to ground during transition periods. An output stage for decoupling output signal from driver amplifier during the transition periods. | 06-24-2010 |
20100183170 | DOCK WITHOUT A POWER SOURCE FOR DIGITAL DEVICES - There is provided a dock without a power source for a portable digital device with at least one integrated speaker driver. The dock may include a platform for placement of the portable digital device; a protrusion located at the platform for connection of the portable digital device with the dock with the protrusion including a slot for egress of air from at least one hole in a casing of the portable digital device to the dock; and at least one primary chamber to receive air from the portable digital device with the at least one primary chamber having a vented port for the egress of air. Advantageously, sound from the at least one integrated speaker driver is amplified when the portable digital device is connected to the dock. The connection of the portable digital device with the dock may be securable. A horn may be included in an exterior facing opening of the vented port, as the horn advantageously improves aspects of sound such as, for example, sound directivity, radiation efficiency or both of the aforementioned. | 07-22-2010 |
20100189284 | VIBRATION DEVICE AND ACOUSTIC SYSTEM - A vibration device according to the present invention includes: a diaphragm; a support system member that supports the diaphragm in a manner that allows the diaphragm to vibrate; a tubular voice coil bobbin attached to the diaphragm; a magnet which is disposed on at least one side among an inner circumferential surface side and an outer circumferential surface side of the voice coil bobbin, and which is polarized in a vibration direction of the diaphragm, and which forms a magnetic gap on a side that faces the voice coil bobbin; a voice coil which is attached to the voice coil bobbin so as to be disposed within the magnetic gap, and which vibrates the diaphragm and the voice coil bobbin in response to a driving force generated when an input electrical signal is inputted into the voice coil; and a magnetic material member which is attached to the voice coil bobbin so as to be disposed in a balancing position within the magnetic gap, and which is, when vibrating together with the voice coil bobbin, subjected to an action of a magnetic attractive force in a direction away from the balancing position. | 07-29-2010 |
20100195848 | AUDIO PROCESSING APPARATUS - An audio processing apparatus comprising: channel determination section for determining which one of a combination of the first left audio signal and the first right audio signal and a combination of the second left audio signal and the second right audio signal is included in multichannel audio data; and switching section for causing the first amplification section to amplify the first left audio signal and supply the amplified first left audio signal to the first speaker terminal and causing the second amplification section to amplify the first right audio signal and supply the amplified first right audio signal to the second speaker terminal when the combination of the first left audio signal and the first right audio signal is determined to be included; and causing the first amplification section to amplify the second left audio signal and supply the amplified second left audio signal to the third speaker terminal and causing the second amplification section to amplify the second right audio signal and supply the amplified second right audio signal to the fourth speaker terminal when the combination of the second left audio signal and the second right audio signal is determined to be included. | 08-05-2010 |
20100195849 | THERMOACOUSTIC DEVICE - An amplifier circuit for thermoacoustic device includes a peak hold circuit, an add-subtract circuit, and a power amplifier. The peak hold circuit is configured to accept an audio signal and output a peak hold signal. The add-subtract circuit is configured to accept the audio signal and the peak hold signal, and output a modulated signal after a comparison operation of the audio signal and the peak hold signal. The power amplifier is configured to accept the modulated signal, amplify the modulated signal, and output an amplified voltage signal. | 08-05-2010 |
20100220874 | INPUT SELECTOR - A first selector receives a second input signal and a second reference voltage, and selects either one. A first buffer receives the output signal of the first selector, and outputs the signal thus received to a terminal of the first resistor, and to a terminal of the third resistor. A second selector receives a first input signal and a third input signal, and selects either one. A fourth selector receives, as input signals, the output signal of an operational amplifier, a signal that corresponds to the output signal of the second selector, and a signal that corresponds to the second input signal, and selects one signal selected from among the signals thus received. | 09-02-2010 |
20100226513 | AUDIO CIRCUIT - An object is to provide an audio circuit in which flow of excessive current through a capacitive speaker and a drive circuit thereof can be prevented while degradation of sound quality of high-pitched tones is suppressed. The audio circuit for driving a capacitive speaker includes: a weighting circuit for performing weighting in conformity with frequency components of an audio signal; and a signal-voltage limiting compression circuit for compressing a signal, which is input to the drive amplifier or which has been output from the drive circuit, at a prescribed compression ratio in accordance with a difference voltage between the output signal of the weighting circuit and a preset threshold voltage when the weighted signal exceeds the threshold voltage. Alternatively, the audio circuit is provided with a signal-voltage limiting compression circuit for passing, with amplitudes unchanged, signal components below a prescribed frequency contained in the signal reproduced by the capacitive speaker and compressing amplitudes of signal components not less than the prescribed frequency at a prescribed compression ratio. | 09-09-2010 |
20100232628 | Circuits and Methods for Reducing Pop Noise in Class D Amplifiers - In one embodiment the present invention includes a method for starting up a class D amplifier. The method comprises increasing, gating, and driving. The increasing includes increasing a duty cycle of a pulse train from a first duty cycle to a second duty cycle. The gating includes gating a signal based on the increasing of the duty cycle. The gating results in a gated signal. The driving includes driving an output signal from the gated signal to charge an output capacitor. The output capacitor is coupled to a speaker. The increasing of the duty cycle contributes to the charging of the output capacitor such that switching sounds detectable by the human ear are reduced. | 09-16-2010 |
20100246857 | ELECTRONIC DEVICE - Provided is an electronic device which can prevent operation stop attributed to lowering of an electronic device operation voltage. A pre-stage of a power amplifier ( | 09-30-2010 |
20100246858 | AMPLIFIER CIRCUIT - An amplifier circuit comprises differential amplification circuitry comprising an input stage having first and second differential inputs, and an output stage, having respective first and second amplifier components with first and second differential outputs. The first amplifier component of the output stage comprises a first power transistor operably coupled to the first differential output and driven by a first differential output of the input stage, and a third power transistor operably coupled to the first differential output of the amplifier circuit and driven by a second output of the input stage. The second amplifier component comprises a second power transistor operably coupled to the second differential output and driven by a second output of the input stage, and a fourth power transistor operably coupled to the second differential output and driven by the first output of the input stage. Each of the first and second power transistors of the first and second amplifier components is driven in a current mirror arrangement by the respective first and second output of the input stage. | 09-30-2010 |
20100246859 | BIASING CIRCUIT FOR A MICROELECTROMECHANICAL ACOUSTIC TRANSDUCER AND RELATED BIASING METHOD - A biasing circuit for an acoustic transducer is provided with: a voltage-booster stage, which supplies, on a biasing terminal, a boosted voltage for biasing a first terminal of the acoustic transducer; and filtering elements, set between the biasing terminal and the acoustic transducer, for filtering disturbances on the boosted voltage. The biasing circuit is further provided with switches, which can be actuated so as to connect the first terminal to the biasing terminal of the voltage-booster stage, directly during a start-up step of the biasing circuit, and through the filtering elements at the end of the start-up step. | 09-30-2010 |
20100254549 | AMPLIFIER CIRCUIT OF CAPACITOR MICROPHONE - In an amplifier circuit of a capacitor microphone, when a too high input signal from the capacitor microphone is inputted, the levels of output signals of the amplifier circuit are limited. A first feedback capacitor of an operational amplifier is formed using a changeable capacitance type MOS capacitor element, and has a characteristic of increasing the capacitance value CAf | 10-07-2010 |
20100260356 | BAND-SPLITTING TIME COMPENSATION SIGNAL PROCESSING DEVICE - A band-splitting time compensation signal processing device | 10-14-2010 |
20100272293 | AMPLIFIER CIRCUIT AUDIO CIRCUIT AND ELECTRONIC DEVICE - An amplifier circuit which, includes a first input for receiving a first input signal and a second input for receiving a second input signal. A first amplifier section is connected to the first input and the second input is present. The first amplifier section can combine the first signal and the second signal into a first combined signal, the first amplifier being connected to a first output, for outputting the first combined signal. A second amplifier section is connected to the first input and the second input, for combining the first signal and the second signal into a second combined signal, the second amplifier being connected to a second output, for outputting the second combined signal. A common mode section is connected to the first input and the second input, for generating a common mode signal based on a combination of the first signal and the second signal and outputting the common mode signal at a common output connected to the common mode amplifier. The first combined signal, the second combined signal and the common mode signal satisfy the condition that combining the first combined signal and the common mode signal results in a signal with an amplitude proportional to the amplitude of the first input signal and combining the second combined signal and the common mode signal results in a signal with an amplitude proportional to the amplitude of the second input signal. | 10-28-2010 |
20100272294 | TWO-CHANNEL AMPLIFIER WITH COMMON SIGNAL - A two-channel amplifier with common signal including a splitter for establishing three intermediate signals on the basis of two input signals, wherein the three intermediate signals represent two channels, one of the three intermediate signals being a common signal common to both of the two channels and having a representation based on a sum of the two input signals. | 10-28-2010 |
20100290646 | SWITCHING AMPLIFIER - An amplifier having at least one switch controlled by an output voltage of a hysteresis block, wherein the hysteresis block is adapted to receive an input voltage signal based on an integration of an error signal, a low threshold voltage and a high threshold voltage, and is arranged to change the output voltage from a first value to a second value when the input voltage signal is higher than the high threshold voltage and to change the output voltage from the second value to the first value when the input voltage signal is lower than the low threshold voltage, and wherein the low threshold voltage is equal to V | 11-18-2010 |
20100310097 | APPARATUS AND METHOD FOR OUTPUTING AUDIO SIGNAL IN PORTABLE TERMINAL - An apparatus and a method for outputting an audio signal in a portable terminal are provided. The portable terminal for outputting an audio signal includes an ear jack, a modem, and an amplifier. The ear jack connects the portable terminal with one of an earphone and an external apparatus. The modem detects whether one of the earphone and the external apparatus is connected to the ear jack. When connection of the external apparatus is detected, the amplifier high power-amplifies the audio signal and outputs the same to the external apparatus according to a control of the modem. | 12-09-2010 |
20100316234 | PROJECTOR AND AUDIO OUTPUT METHOD - A projector includes: a first audio input section adapted to input a first sound signal; a second audio input section adapted to input a second sound signal; a first sound amplifier section adapted to amplify the first sound signal received through the second audio input section to generate a first amplified signal; a second sound amplifier section adapted to amplify the second sound signal received through the second audio input section to generate a second amplified signal; a first audio output section adapted to output a first sound based on the first amplified signal; a second audio output section adapted to output a second sound based on the second amplified signal; and a determination section adapted to determine whether or not the first sound signal is being input. | 12-16-2010 |
20100322440 | AUDIO PROCESSING CIRCUIT AND PREAMPLIFIER CIRCUIT - An audio processing circuit is provided, receiving a microphone signal from a microphone to output a differential signal. A preamplifier receives the microphone signal to output a first preamplified voltage and a second preamplified voltage. A gain stage receives the first preamplified voltage and the second preamplified voltage to output the differential signal comprising a first differential output and a second differential output. In the preamplifier, a first operational amplifier is provided. A first voltage controlled current source is controlled by the output end of the first operational amplifier to provide a first current. A first transistor has a gate coupled to a ground voltage supply, a source coupled to the first voltage controlled current source for receiving the first current, and a drain coupled to a voltage ground. Likewise, a second voltage controlled current source and a second transistor are presented symmetrically to render the differential output. | 12-23-2010 |
20100322441 | NOTEBOOK POWER SUPPLY WITH INTEGRATED SUBWOOFER - A portable electrical appliance comprises an audio signal source, a power supply module having a housing external to the portable electrical appliance for providing power to the electronic appliance having, a power converter for providing DC power to at least the portable electrical appliance, a speaker for generating sound and audio processing means for manipulating audio signals from the audio signal source, wherein the power converter, audio processing means and speaker are mounted within the housing, and communication means for coupling the audio signal to the processing means. The communication means is able to be wireless or wired. | 12-23-2010 |
20100329484 | Audio Amplifier Attachable to Speaker System by Way of Magnetic Coupler and Method Therefor - An audio system comprises a first enclosure for housing a first audio component and a second enclosure for housing a second audio component. The first enclosure includes a surface having a plurality of first structures, the first structures comprising one selected from a group consisting of a plurality of protrusions and a plurality of receptacles. The second enclosure includes a surface having a plurality of second structures, the second structures comprising the other one from the group consisting of the plurality of protrusions and the plurality of receptacles. The protrusions are configured to be inserted into the receptacles along a first direction such that the first enclosure is maintained in a first position relative to the second enclosure in the presence of a shear force that is applied in a direction that is perpendicular to the first direction. | 12-30-2010 |
20110019843 | High Efficiency Audio Amplifier and Method thereof - A high efficiency audio amplifier is disclosed. The high efficiency audio amplifier includes an input end for receiving an input audio signal, an output end for outputting an output audio signal, a signal generator coupled to the input end for determining a frequency of an oscillating signal according to the distribution of the input audio signal and a reference voltage, and generating the oscillating signal accordingly, a waveform transformer coupled to the input end and the signal generator for comparing the input audio signal with the oscillating signal to generate a pulse width modulation (PWM) signal, a pre-drive circuit for generating a pre-drive signal according to the PWM signal, an output stage coupled to the pre-drive circuit for generating an output signal, and a filter coupled to the output stage for filtering the output signal to generate the output audio signal to the output end. | 01-27-2011 |
20110026739 | HIGH LEVEL CAPABLE AUDIO AMPLIFICATION CIRCUIT - The present invention relates to an audio amplification circuit with first and second signal channels which generate first and second digital audio signals with different signal amplifications from a common audio input signal and a method of amplifying a common audio input signal with different signal amplifications to provide first and second digital audio signals with different amplification. The audio amplification circuit is particularly well-adapted for cooperating with an external or integral audio signal controller configured for receipt and processing of the first and second digital audio signals. | 02-03-2011 |
20110058692 | AUDIO OUTPUT DEVICES - An audio output device is provided and includes a power source, a controller, a signal generating circuit, and a first amplifier. The power source provides a supply voltage signal. The controller receives the supply voltage signal. The controller further compares the supply voltage signal with a threshold voltage signal and generates a control signal according to the comparison result. The signal generating circuit generates a first analog signal. The first amplifier receives the first analog signal and generates a first amplified signal according to the control signal. | 03-10-2011 |
20110069849 | Portable Amplifier - A portable amplifier for use with electric guitars and other audio output sources. The amplifier comprises a housing, which houses components required for a portable amplifier, including a power source, at least one speaker and a male input plug that can be extended or retracted into the body of the housing. In one embodiment, the male input plug can be positioned in a plurality of orientations for insertion into musical instruments. | 03-24-2011 |
20110096944 | HIGH PERCEIVED AUDIO QUALITY CLASS D AMPLIFIER - An audio amplifier and a method of operating such an amplifier are disclosed. The audio amplifier includes a switch disabling controller and/or an output set-point controller. The switch disabling controller is configured to disable switching of an output switch circuit or other switch circuit while an input signal represents at least relative silence. The output set-point controller is configured to bring and/or hold first and second switch nodes toward and/or at a set-point voltage while the input signal represents at least relative silence. | 04-28-2011 |
20110096945 | Microphone unit with internal A/D converter - The present invention relates to a microphone assembly comprising a microphone assembly casing having a sound inlet port and a transducer for receiving acoustic waves through the sound inlet port. The transducer converts the received acoustic waves to analog audio signals. The assembly according to the present invention further comprises an electronic circuit positioned within the microphone assembly casing, said electronic circuit comprising a pre-amplifier and an analog-to-digital converter preferably in form of a sigma-delta modulator so as to convert amplified analog audio signals to digital audio signals. | 04-28-2011 |
20110103619 | AMPLIFIER CIRCUIT AND METHODS OF OPERATION THEREOF - A signal amplifying circuit and associated methods and apparatuses, the circuit comprising: a signal path extending from an input terminal to an output terminal, a gain controller arranged to control the gain applied along the signal path in response to a control signal; an output stage within the signal path for generating the output signal, the output stage having a gain that is substantially independent of its supply voltage, and a variable voltage power supply comprising a charge pump for providing positive and negative output voltages, the charge pump comprising a network of switches that is operable in a number of different states and a controller for operating the switches in a sequence of the states so as to generate positive and negative output voltages together spanning a voltage approximately equal to the input voltage. | 05-05-2011 |
20110110537 | Light-Powered Loudspeaker System - A light-powered loudspeaker system including a solar power generator, a power storage device, a wireless signal receiver, a power amplifier and a speaker module is disclosed. The solar power generator is configured to receive a solar energy and convert the received solar energy into electricity energy. The power storage device is coupled to the solar power generator for storing the converted electricity energy. The wireless signal receiver is coupled to the power storage device, receives wireless audio signals and generates an output signal. The power amplifier is coupled to the power storage device and the wireless signal receiver, amplifies the output signal and generates an amplified audio signal. The speaker module is coupled to the power amplifier and produces voices according to the amplified audio signal. | 05-12-2011 |
20110110538 | POWER AMPLIFIER AND METHOD FOR RESTRAINING POWER OF IMPROVED POWER AMPLIFIER - The present invention is related to an improved power amplifier and a method for restraining power of the improved power amplifier. The improved power amplifier has an output power restraint unit, and the output power restraint unit is capable of restraining output power of the improved power amplifier when the output power is exceedingly large. A method for restraining power of a power amplifier, the method comprises the steps of: determining whether power of output powers signal are exceedingly large through a power signal transformation unit, if yes, adjusting two variable resistor of an input amplifier unit for adjusting the power of the power signals, and outputting the adjusted power signals for driving a load via output terminals of the power amplifier. | 05-12-2011 |
20110110539 | SELF-OSCILLATING AUDIO AMPLIFIER AND METHOD FOR RESTRAINING THE IMPROVED SELF-OSCILLATING AUDIO AMPLIFIER - An improved self-oscillating audio amplifier and a method for restraining audio distortion of the self-oscillating audio amplifier are disclosed. The improved self-oscillating audio amplifier comprises a distortion restraint unit configured to detect whether modulated audio signals outputted from the self-oscillating audio amplifier is distorted and, if so, to restrain the distortion. The method for restraining audio distortion of the self-oscillating audio amplifier includes the following steps of: determining whether the modulated audio signals outputted from an audio amplifier positive output terminal is distorted by a first flip-flop set, and if yes, restraining the distortion of the modulated audio signals outputted from the audio amplifier positive output terminal; and outputting the modulated audio signals to drive a speaker by the audio amplifier positive output terminal and an audio amplifier negative output terminal. | 05-12-2011 |
20110110540 | SHELF - A shelf is equipped with an audio amplifier and at least one loudspeaker. The shelf can be integrated into the interior design as a shelf while providing multimedia use for audio playback, video output, and connection to a computer, as well as serve for the high-quality enjoyment of music and its functional application, using only one device. | 05-12-2011 |
20110116658 | FINE NATURAL FIBER AND SPEAKER DIAPHRAGM COATED WITH FINE NATURAL FIBER - Natural fiber is beaten with a biaxial kneading machine. The beaten natural fiber is processed finely with a bead mill so as to allow the processed natural fiber to have a BET specific surface area not smaller than 1 m | 05-19-2011 |
20110123048 | CLASS G AUDIO AMPLIFIERS AND ASSOCIATED METHODS OF OPERATION - The present technology is directed to class G audio amplifiers and the associated methods of operation. In one embodiment, a class G audio amplifier includes an input port, an audio output stage, a level detector, and a charge pump. The class G audio amplifier regulates the power supplies of the audio output stage according to the input signal, so as to realize high efficiency and high quality audio output. | 05-26-2011 |
20110129103 | ELECTRONIC APPARATUS - According to one embodiment, an electronic apparatus includes a terminal, an amplifier, a speaker, a power supply circuit and a first controller. The terminal configured to input an audio signal from an external device. The amplifier configured to amplify the audio signal. The speaker configured to output sound corresponding to the audio signal which is amplified by the amplifier. The power supply circuit configured to supply power to the amplifier. The first controller configured to control the power supply circuit to continue the supply of the power, when the electronic apparatus is in a non-operative state. | 06-02-2011 |
20110129104 | ELECTRONIC APPARATUS - According to one embodiment, an electronic apparatus includes a terminal, an amplifier, a speaker, a power supply circuit, a first switch and a first controller. The terminal configured to input an audio signal from an external device. The amplifier configured to amplify the audio signal which is input from the terminal. The speaker configured to output sound corresponding to the audio signal which is amplified by the amplifier. The power supply circuit connected to the amplifier. The first controller configured to control the power supply circuit in order to supply the power to the amplifier, when the electronic apparatus is in a non-operative state and the first switch is turned on. | 06-02-2011 |
20110135116 | Method and Apparaus for Biasing an Amplifier - An apparatus and method for biasing each amplifier of an amplification stage provides that the voltage across each current sensing element of each amplifier of the amplification stage is measured. For each pair of voltage measurements taken, a sum and difference is calculated, where the sum is processed to determine minima peaks and the difference is averaged. A portion of the sum term and the average of the difference term are summed to yield the individual bias current conducted by a first amplifier of the amplification stage. The difference between a portion of the sum term and the average of the difference term is calculated to yield the individual bias current conducted by the second amplifier of the amplification stage. The bias current conducted by the first and second amplifiers may then be individually modified manually, or conversely, may be modified automatically based upon the bias current measurements taken. | 06-09-2011 |
20110142262 | AUDIO PROCESSING APPARATUS - A switching section causes the first amplification section to amplify the expansion left audio signal and supply the amplified expansion left audio signal to the first speaker terminal and causing the second amplification section to amplify the expansion right audio signal and supply the amplified expansion right audio signal to the second speaker terminal when the Bi-Amp function is not used. The switching section causes the first amplification section to amplify the left audio signal for Bi-Amp and supply the amplified left audio signal for Bi-Amp the first speaker terminal and causing the second amplification section to amplify the right audio signal for Bi-Amp and supply the amplified right audio signal for Bi-Amp to the second speaker terminal when the Bi-Amp function is used. | 06-16-2011 |
20110150244 | Audio Signal Amplifier for Karaoke Player - A configurable amplifier circuit for a karaoke player is described. In one embodiment, a karaoke player includes: a DVD/CD reader port for coupling to a DVD/CD reader, a microphone input to receive audio signals from an external microphone, an MPEG decoder coupled to the DVD/CD reader port and the microphone input, the MPEG decoder having first and second output terminals, a processor coupled to the MPEG decoder, the processor to control the MPEG decoder, and a configurable amplifier coupled to the first and second output terminals, wherein a first audio signal originating from the first output terminal is selectively amplified by the configurable amplifier circuit in accordance with a second signal originating from the second output terminal. | 06-23-2011 |
20110150245 | CAPACITIVE LOAD DRIVING AMPLIFIER - An electronic amplifier for driving a capacitive load may include first and second differential input terminals to receive an input signal, and first and second differential output terminals to provide a differential output signal. The amplifier may further include a first operational device having first and second differential inputs connected to the first and second differential input terminals, respectively, and an output connected to the first differential output terminal, and a second operational device having first and second differential inputs connected to the first and second differential input terminals, respectively, and an output connected to the second differential output terminal. The first and second operational devices may be operatively configured so that both the first and the second output terminals are at a same reference potential during periods in which a module of differential output signal amplitude decrease. | 06-23-2011 |
20110158435 | AUDIO SIGNAL AMPLIFIER CIRCUIT - An inverting amplifier which drives headphones via an output capacitor includes: an operational amplifier, an input resistor having a first terminal via which an audio signal to be amplified is received, and a second terminal connected to an inverting input terminal of the operational amplifier; and a feedback resistor having a first terminal connected to an inverting input terminal of the operational amplifier, and a second terminal connected to the output terminal. A reference voltage source generates a bias voltage Vb, and supplies it to the non-inverting input terminal. A discharging path includes a discharging resistor and a first switch arranged in series between an output terminal of the reference voltage source and an fixed voltage terminal. A second switch is arranged between the output terminal of the operational amplifier and a node on the discharging path where the electric potential is higher than it is at the discharging resistor. | 06-30-2011 |
20110158436 | ELECTRONIC APPARATUS - According to one embodiment, an electronic apparatus includes a speaker, a terminal, an amplifier, a power supply circuit, a setting module, a detection module, and a controller. The terminal is configured to input an audio signal from an external device. The amplifier is configured to amplify the audio signal, and to output audio from the speaker. The power supply circuit is configured to supply power to the amplifier. The setting module is configured to set data which indicates whether audio output from the speaker is to be enabled or disabled when the apparatus is in a non-operative state. The detection module is configured to detect a predetermined state of the apparatus. The controller is configured to control the power supply circuit, based on the data and the predetermined state, in order to supply the power to the amplifier when the apparatus is in the non-operative state. | 06-30-2011 |
20110158437 | AUDIO AMPLIFIER HAVING LOAD ADJUSTMENT AND METHOD FOR THE LOAD ADJUSTMENT OF THE AUDIO AMPLIFIER - The invention relates to an audio amplifier ( | 06-30-2011 |
20110164764 | DIAPHRAGM FOR SPEAKER, SPEAKER USING THE DIAPHRAGM, ELECTRONIC DEVICE USING THE SPEAKER, AND SPEAKER-MOUNTED DEVICE - A speaker diaphragm containing resin and carbonized bamboo material with a large degree of flexibility in setting physical properties, moisture-proof reliability and strength secured, superior appearance, and productivity and dimensional stability increased, which allows making characteristics and sound highly accurately, and designing with great originality. | 07-07-2011 |
20110164765 | PRODUCT OR PACKAGING SYSTEM WITH INTEGRATED ELECTRONICS - The present invention is directed to products, product packaging, or product displays containing an electrical component ( | 07-07-2011 |
20110164766 | Ribbon loudspeaker module and amplifier therefore - A ribbon loudspeaker module includes a ribbon element of electrically conductive material and having a resistance of less than 1Ω and a magnetic system arranged to create a magnetic field about the ribbon element. A buffer amplifier having an input is arranged to receive a loudspeaker drive signal from an audio power amplifier and an output arranged to drive the ribbon element directly. The ribbon loudspeaker module is preferably a low frequency module, designed to handle audio signals below 5 kHz, and preferably in the range 20 Hz to 3 kHz or a part thereof. The ribbon element may have a resistance of less than 0.5Ω, less than 0.2Ω and even as little as 0.15Ω or less. | 07-07-2011 |
20110170716 | Methods And Apparatus For Variable Solid State-To-Tube Rectification In An Amplifier - Methods and apparatus provide for: a rectification circuit operating to convert a source of AC power into a final DC power source; a rectification filtering capacitance operating to at least partially smooth a voltage of the final DC power source, which exhibits a voltage sag and recovery characteristic in response to time-variant current drawn therefrom; a power amplification circuit drawing power from the final DC power source and producing an output signal, for driving a speaker, having audible characteristics influenced by the voltage sag and recovery characteristic of the final DC power source; and a control circuit operating to continuously vary, in response to user input, one or more parameters of the voltage sag and/or recovery characteristic of the final DC power source. | 07-14-2011 |
20110170717 | METHOD AND APPARATUS FOR AMPLIFYING AUDIO SIGNAL - An audio signal amplifying device and method for reducing a size and corresponding power consumption of demodulation filters in the signal amplifying device. In the device and method, carrier waves having phase shifts are generated from a received audio signal. The shifted carrier waves are compared to the audio signal to generate modulation signals, which are amplified based on a power supply voltage. The amplified modulation signals or a power supply signal are output based on a comparison between the carrier waves and the audio signal. The output signals are synthesized to produce a synthesized signal having a lower average voltage and current value, thus reducing power consumption of the signal amplifying device. | 07-14-2011 |
20110176693 | ELECTRONIC DEVICE AND INTEGRATED CIRCUIT COMPRISING A GAIN CONTROL MODULE AND METHOD THEREFOR - A method for controlling a gain applied to an audio signal. The method comprises applying a gain step to a gain setting at defined time intervals, and upon detection of at least one zero crossing point within the audio signal, applying the gain setting to a gain control signal for controlling the gain applied to the audio signal. | 07-21-2011 |
20110176694 | Multi-port combiner for an audio amplifier - A multi-port combiner for an audio amplifier is configured with a plurality of series-parallel coupled connection ports to enable one or more speaker monitors coupled thereto to receive audio signals from a single output port of the amplifier. The multi-port combiner also includes a phantom load having an impedance that is equivalent to that of one of the speaker monitors. As such, the phantom load is selectively coupled to the connection ports to maintain the series-parallel configuration of the connection ports, so that the equivalent impedance of all the speaker monitors coupled to the multi-port combiner is maintained within an acceptable operating range established by the amplifier. | 07-21-2011 |
20110188675 | ELECTRONIC APPARATUS - According to one embodiment, an electronic apparatus includes a speaker, a terminal, an amplifier, a battery, a power supply circuit, and a controller. The terminal is configured to input an audio signal from an external device. The amplifier is configured to amplify the audio signal which is input from the terminal, and to output audio from the speaker. The power supply circuit is configured to supply power from the battery to the amplifier. The controller is configured to control the power supply circuit, based on a residual capacity of the battery and a preset battery level, in order to supply the power to the amplifier when the electronic apparatus is in a non-operative state. | 08-04-2011 |
20110216920 | SPEAKER DRIVE INTEGRATED CIRCUIT - A speaker drive integrated circuit of the present invention includes: a load connection status detecting circuit configured to cause a current to flow from an external power supply to one of output terminals when an output side of an amplifying circuit is set to a high impedance state and detect whether a load connection status is normal, open, or short based on a voltage generated at the output terminal; and a transmitting terminal through which a signal indicating a detection result by the load connection status detecting circuit is output to outside. | 09-08-2011 |
20110235827 | AMPLIFIER CIRCUIT AND METHODS OF OPERATION THEREOF - A signal amplifying circuit and associated methods and apparatuses, the circuit comprising: a signal path extending from an input terminal to an output terminal, a gain controller arranged to control the gain applied along the signal path in response to a control signal; an output stage within the signal path for generating the output signal, the output stage having a gain that is substantially independent of its supply voltage, and a variable voltage power supply comprising a charge pump for providing positive and negative output voltages, the charge pump comprising a network of switches that is operable in a number of different states and a controller for operating the switches in a sequence of the states so as to generate positive and negative output voltages together spanning a voltage approximately equal to the input voltage. | 09-29-2011 |
20110243352 | Concept, method and apparatus of improved distortion switched-mode amplifier - Systems and methods for switched-mode amplifiers having improved harmonic distortion are disclosed. High order in-band filtering is enabled without undue trade-off of distortion due to intermodulation/aliasing. A pre-modulation block is introduced, deployed between a loop filter block and a pulse-width modulation block, performing uniform pulse-width modulation. The pre-modulation block attenuates/removes amplitude dependent high frequency ripples before pulse-width modulation. The pre-modulation block in conjunction with the pulse-width modulation block performs double sampling of the input signals. | 10-06-2011 |
20110249832 | SPEAKER DEVICE - A speaker device includes: a casing having a cylindrical shape which opens at one end side; and a sounding body arranged at the other end side of the casing and driven based on an audio signal, wherein a sealed space is formed by the casing and a setting surface when the casing is set, which functions as a cabinet. | 10-13-2011 |
20110261978 | Electronic Apparatus - According to one embodiment, an electronic apparatus includes a speaker, a terminal, a first detector, a second detector, an amplifier, a power supply circuit and a control module. The terminal is configured to connect an external device via a connection member, the external device outputting an audio signal. The first detector is configured to detect that the connection member is connected to the terminal. The second detector is configured to detect that the audio signal is received via the terminal. The amplifier is configured to amplify the audio signal and to produce sound from the speaker. The controller is configured to control the power supply circuit to supply power to the amplifier, when the first detector detects that the connection member is connected to the terminal, the second detector detects that the audio signal is received, and the electronic apparatus is in an inoperative state. | 10-27-2011 |
20110274295 | NEGATIVE-VOLTAGE CHARGE PUMP CIRCUIT - A control unit alternately repeats a first state in which a first switch and a third switch are on and a second state in which a second switch and a fourth switch are on. A voltage detection unit compares the output voltage that occurs at one terminal (OUT terminal) of an output capacitor with a negative threshold voltage, and generates an abnormality detection signal which is asserted when the output voltage is higher than the threshold voltage Vt. When the abnormality detection signal is asserted, the control unit switches the on resistance of the first switch to a value that is higher than that in a normal state. | 11-10-2011 |
20110286611 | DIGITAL AMPLIFIER - A digital amplifier is described with decreased high-frequency noise current flowing into GND via a capacitor in a low-pass filter output. Consequently output sound quality is improved because AC loops of noise current that occur are balanced while each switch is turned on. | 11-24-2011 |
20110305353 | AUDIO AMPLIFIER WITH CLOSED-LOOP POWER - The present technology relates generally to a closed-loop power stage and audio amplifier circuits comprising the same. The present technology further provides a method for controlling an amplifier circuit. The closed-loop power stage is configured to receive a PWM input signal having a first frequency and a first duty cycle, a power supply voltage, and a bias signal related to the power supply voltage, and to output a square-wave signal having a second frequency and a second duty cycle. The closed-loop power stage comprises a feedback loop which is configured to regulate the second duty cycle of the square-wave signal in response to a variation in the power supply voltage. The audio amplifier circuit comprising the closed-loop power stage may have a stable output voltage and thus have good power supply rejection performance. | 12-15-2011 |
20110305354 | SYSTEMS AND METHODS FOR CONTROLLING HDA SYSTEM CAPABILITIES - Systems and methods for controlling the capabilities of an High Definition Audio (HDA) system, wherein the system determines whether an optional component such as a plug-in card is connected to the system and then configures itself in a baseline configuration if the optional component is not connected or configures itself in a different, alternative configuration if the optional component is connected. In one embodiment, a codec of the system includes a programmable processor configured to read configuration authorization information and also read configuration information from the optional component if it is connected to the system. The processor also controls the configuration of the HDA system and the operation of the codec based on the authorization and configuration information. The system can thereby provide different features and functionality using the same hardware. | 12-15-2011 |
20110311076 | Method for adjusting the maximum output power of a valve power amplifier stage for an audio amplifier, and corresponding valve power amplifier stage - A valve power amplifier stage for an audio amplifier, which amplifier stage has at least one thermionic valve and a polarization circuit for polarizing the anode, the cathode and the control grid of the thermionic valve so as to determine the maximum output power. The polarization circuit comprises an adjusting module for adjusting the feed voltage of the anode and the polarization voltage of the control grid so as to adjust the maximum output power of the thermionic valve, and a potentiometer coupled with the adjusting module for allowing a user to control the adjusting means so as to select the desired maximum output power from a plurality of predetermined output power values. | 12-22-2011 |
20120033834 | Apparatus With Directivity Pattern - A loudspeaker is described. The loudspeaker includes two or more segmentations of a planar radiator. Each of the segmentations has an associated frequency dependent velocity magnitude and phase with substantially uniform surface pressure. The two or more segmentations provide a substantially uniform radiation pattern across a wide range of acoustic frequencies. Apparatus, computer readable media and methods are also described. | 02-09-2012 |
20120039491 | INERTIAL TYPE ACOUSTIC TRANSDUCER - The present invention is drawn to inertial type transducers and a system for reducing the complexity and difficulty of installing the transducers internal to a structure. The transducer is equipped with a wireless receiver for receiving both sound content signals and control signals, and an amplifier, along with a power supply. Because the amplifier is activated by the wireless receiver, there are no wires necessary to connect the transducer to the source of the sound content or control signals thereby vastly simplifying installation. Heat dissipation and height minimization are also addressed. | 02-16-2012 |
20120045076 | ELECTRONIC CIRCUIT FOR DRIVING A SWITCHING AMPLIFIER - An electronic circuit is disclosed for driving a switching amplifier. The electronic circuit is configured for generating, when operating in a switch-on mode, a driving signal for driving the switching amplifier. The driving signal carries a plurality of pulses having: an pulse width increasing between contiguous pulses of the plurality of pulses according to a step value having modulus equal to two and odd values; a polarity alternating between the contiguous pulses. | 02-23-2012 |
20120076326 | ALL-IN-ONE COMPUTER AUDIO SYSTEM - An all-in-one audio system includes an audio chip, an audio interface, first and second audio signal amplifiers, a speaker, a woofer, a multi-function controller, a high definition multimedia interface (HDMI), and a switch. The multi-function controller is connected to the audio chip, the switch, the audio interface, the first and second audio signal amplifiers, and the HDMI. When the multi-function controller detects a high definition multimedia signal through the HDMI, the multi-function controller turns off the switch, decodes the high definition multimedia signal into an audio signal, and transmits the audio signal to the audio interface, and the first and second audio signal amplifiers. The first and second audio signal amplifiers amplify the audio signal and output the amplified audio signal to the speaker and woofer. | 03-29-2012 |
20120087518 | Full Range Planar Magnetic Microphone and Arrays Thereof - Contemplated planar magnetic microphones have a magnet and diaphragm arrangement such that substantially homogenous vertical and high horizontal magnetic flux density is realized in the inter-magnet space. Most preferably, the diaphragm is disposed in the inter-magnet space and includes a voice coil covering a significant fraction of the active portion of the membrane. In further especially preferred aspects, the membrane is sufficiently strong and tensioned to allow a large elastic excursion in the inter-magnet space. Consequently, contemplated planar magnetic microphones provide exceptionally large dynamic range without compression and/or distortion and can be easily configured to operate in an environment that is subject to moisture, rain, or to even operate in a submerged environment. Moreover, contemplated microphones can be used as speakers at even high SPL without reconfiguration. | 04-12-2012 |
20120099742 | AUDIO JACK WITH ESD PROTECTION - A plug-and-jack for use with an electronic device that is configured to ensure circuitry of the device is protected from electrostatic discharge. In one case, the jack is an audio jack designed to protect high gain circuitry of the device against electrostatic discharge from the leads of an audio plug. The jack includes a mechanical switch that only connects the high gain circuitry to the appropriate portion of the audio plug once the audio plug is fully inserted. At the same time, the mechanical switch also connects the high gain circuitry and corresponding portion of the audio plug to an electrostatic discharge circuit. | 04-26-2012 |
20120099743 | CLASS D AMPLIFICATION DEVICE - A controller | 04-26-2012 |
20120106760 | AUDIO AMP WITH SPURIOUS WAVE NOISE REDUCTION CIRCUIT - An audio amplifier with a spurious wave noise reduction circuit according to the present invention comprises: an input unit receiving the audio signal for each channel; a modulation unit converting the audio signal into a pulse width modulation (PWM) signal; an amplification unit amplifying the PWM signal; an output unit extracting the audio signal from the amplified PWM signal to output; a power supply applying power to the input unit, the modulation unit, the amplification unit, and the output unit; and a pulse generation unit generating a first reference signal that is a pulse signal applied to the modulation unit and a second reference signal that is a pulse signal applied to the power supply. In the amplifier of the present invention, the first reference signal is applied to the modulation unit to synchronize the PWM signal with respect to the audio signal for each channel, and the second reference signal is applied to the power supply to synchronize the pulse signal generated in the power supply with the PWM signal to reduce spurious wave noise occurring in the audio amplifier. | 05-03-2012 |
20120121109 | Analog-to-digital Converting Method and Functional Device Using the Same - An analog-to-digital converting method for converting an analog signal to a digital signal is disclosed. The analog-to-digital converting method includes decomposing the analog signal into a major analog signal and a minor analog signal, converting the major analog signal to a major digital signal, determining to which of a plurality of default sections the minor analog signal belongs to generate a minor digital signal correspondingly, and combining the major digital signal and the minor digital signal to form the digital signal. | 05-17-2012 |
20120128180 | Analog-to-Digital Converter and Analog-to-Digital Conversion Method - The invention provides an analog-to-digital converter. In one embodiment, the analog-to-digital converter receives a first audio signal from a microphone, and comprises a coding selection module, a pre-amplifier, a | 05-24-2012 |
20120128181 | Analog-to-Digital Converter, Sound Processing Device, and Method for Analog-to-Digital Conversion - The invention provides a sound processing device. In one embodiment, the sound processing device comprises a first microphone, a first analog-to-digital converter, a second microphone, and a second analog-to-digital converter. The first microphone detects a first sound pressure to generate a first analog audio signal. The first analog-to-digital converter converts the first analog audio signal to a first digital audio signal. The second microphone detects a second sound pressure to generate a second analog audio signal. The second analog-to-digital converter converts the second analog audio signal to a second digital audio signal, encodes a third digital audio signal according to the second digital audio signal, receives the first digital audio signal and a clock signal, outputs data bits of the third digital audio signal when the clock signal oscillates to a logic low level, and outputs data bits of the first digital audio signal when the clock signal oscillates to a logic high level. | 05-24-2012 |
20120128182 | Analog-to-Digital Converter and Analog-to-Digital Conversion Method - The invention provides an analog-to-digital converter. In one embodiment, the analog-to-digital converter receives a first audio signal from a microphone sensor, and receives a first channel selection signal and a clock signal, and comprises a toggle detection module, a first data processing module, a second data processing module, and a multiplexer. The toggle detection module detects whether the first channel selection signal is toggling between a logic low level and a logic high level to generate a control signal. The first data processing module processes the first channel selection signal to generate a second channel selection signal. The second data processing module converts the first audio signal from analog to digital to generate a second audio signal. If the control signal indicates that the first channel selection signal is toggling between the logic low level and the logic high level, the multiplexer outputs data bits of the second channel selection signal as an output signal of the analog-to-digital converter when the clock signal oscillates to the logic high level, and outputs data bits of the second audio signal as the output signal of the analog-to-digital converter when the clock signal oscillates to the logic low level. | 05-24-2012 |
20120134514 | AMPLIFIER AND AMPLIFIER CONTROL METHOD - Disclosed is a class D amplifier comprising a modulation stage having a first input for receiving an input signal and an output for producing a modulated version of the input signal; a plurality of power stages, each power stage being responsive to said modulation stage and comprising a first switch and a second switch coupled in series between a first voltage source and a second voltage source, each power stage comprising an output node between the first switch and the second switch; and a power stage control circuit for measuring the input signal level and enabling a selected number of the power stages as a function of the measured input signal level. A method for controlling such a class D amplifier is also disclosed. | 05-31-2012 |
20120140957 | APPARATUS, SYSTEMS AND METHODS FOR CONTROLLING AN ELECTRONIC DEVICE USING AN ACCESSSORY - A system for controlling an electronic device, including an accessory coupled to the device having a control interface for receiving at least one input and a tone generator, the accessory configured to, in response to an input, generate a corresponding control tone using the tone generator, and send the control tone and a calibration sequence to the device. The device is operable to receive the calibration sequence and control tone. The device includes a zero-crossing detector operable to determine at least one of the start or ending of each of the calibration sequence and the control tone and having a circuit operable to determine the periods of the calibration sequence and the control tone based on the zero-crossing detector output. | 06-07-2012 |
20120148072 | APPARATUS AND METHOD FOR WIDENING AUDIO SIGNAL BAND - An audio signal band expanding apparatus ( | 06-14-2012 |
20120155675 | Microphone Amplifier - A microphone amplifier comprises an input terminal (E | 06-21-2012 |
20120155676 | IMPEDANCE MATCHING SPEAKER WIRE SYSTEM - An impedance matched connection is provided between a load and a power source that outputs signals within a predetermined frequency range. A coaxial line has a predetermined characteristic impedance, an inner conductor, an outer conductor, and an insulator between the conductors. Each conductor has a first end electrically connectable to output terminals of the power source. A compensation circuit has an adjustable impedance, a first terminal electrically connected to a second end of the inner conductor and to a first terminal of the load, and a second terminal electrically connected to a second end of the outer conductor and to a second terminal of the load. The compensation circuit is adjustable to attain, for a pulse having a rise time/fall time faster than the rise/fall times associated with the predetermined range of frequencies, a combined impedance and load that is substantially equal to the characteristic impedance of the coaxial line. | 06-21-2012 |
20120170773 | AMPLIFIER WITH HIGH-FREQUENCY NOISE REMOVING FUNCTION, MICROPHONE MODULE, AND SENSOR MODULE - An amplifier | 07-05-2012 |
20120170774 | AMPLIFIER CIRCUIT - An amplifier circuit for amplifying audio signal output by an audio source and outputting the amplified audio signal to a speaker is provided. The amplifier circuit includes a peripheral circuit and an amplifier chip including an amplifier, a first, a second, a third resistor, and a fourth resistor. The peripheral circuit includes a fifth and a sixth resistors. The first resistor is connected between a non-inverting input port and an output port of the amplifier, the second resistor is connected between an inverting input port and the output port of the amplifier, the third resistor is connected between the non-inverting input port and the fifth resistor, the fourth resistor is connected between the inverting port and the sixth resistor, the fifth and the sixth resistors are further respectively connected to an anode output port of the audio source and a cathode output port of the audio source. | 07-05-2012 |
20120177230 | SOUND MANAGEMENT DEVICE - A unitary sound management device including an analog amplification system ( | 07-12-2012 |
20120177231 | INTERACTIVE PLAY SYSTEM - An interactive play system including a handheld device and an insertion device is provided. An interactive application program is embedded in the handheld device. The insertion device includes a dock, an amplifier, a speaker, and a slave circuit. The dock carries the handheld device. The speaker is coupled to the amplifier and used for playing a sound. The slave circuit is coupled to the amplifier. When the handheld device is placed in the dock of the insertion device and accordingly activates the interactive application program, the handheld device displays an interactive graphical user interface, and the slave circuit and the amplifier are coupled to the handheld device, so as to guide a user to set the insertion device. The handheld device controls various functions of the slave circuit. | 07-12-2012 |
20120183157 | STRUCTURE FOR AMPLIFIER - An improved structure for an amplifier comprises: a single member, which at least has a frame, an edge and a membrane; and a positioning shrapnel, which is assembled by an inner frame, an outer frame and a plurality of flexible braces, the outer frame is firmly disposed at the frame of the single member, the plurality of flexible braces is disposed between the inner frame and the outer frame, the inner frame is firmly disposed on the membrane of the single member, wherein the peripheral of the frame has a fillister that can be embedded in by the outer frame, each connection of any of the flexible braces and the inner frame is a curve portion that is to keep the connection of the inner frame and the outer frame while a height difference is existed between the inner frame and the outer frame. | 07-19-2012 |
20120183158 | MODULAR SPEAKER SYSTEM - A modular speaker system includes a base assembly having a longitudinally extending, central support member and a support leg extending therefrom in a manner supporting the central support member in a generally upright configuration. The central support member includes a first end and a second end. A first woofer is secured to the base assembly, and a base assembly amplifier is mounted within the central support member and connected to the first woofer. An auxiliary speaker assembly includes a longitudinally extending, auxiliary support member having a first end and a second end, the first end being shaped and dimensioned for selective engagement with the second end of the central support member. A first driver is secured to the auxiliary speaker assembly and an amplifier is mounted within the auxiliary support member and is connected to the first driver. | 07-19-2012 |
20120183159 | MODE SWITCHING NOISE CANCELLATION FOR MICROPHONE-SPEAKER COMBINATIONS USED IN TWO WAY AUDIO COMMUNICATIONS - An audio host device has an electrical interface having a speaker contact, a microphone contact, and a reference contact. The reference contact is shared by a microphone and a speaker. The reference contact is also directly coupled to a power return plane of the audio host device. A difference amplifier is provided, having a cold input and a hot input. The hot input is coupled to the microphone contact. A switched attenuator circuit is also provided that has first and second states. In the first state, the attenuator circuit couples a sense point of the reference contact to the cold input, while in the second state the cold input is isolated from the reference sense point. Other embodiments are also described and claimed. | 07-19-2012 |
20120207330 | AUDIO SIGNAL AMPLIFYING CIRCUIT - The present disclosure provides an audio signal amplifying circuit for an electronic device including a processing chip and a speaker. The audio signal amplifying circuit includes an amplifying circuit and an inverting circuit connected to the processing chip to get a first control signal and invert the first control signal to generate a second control signal. The first control signal and/or the second control signal are used to control the operation mode of the amplifying circuit to be in an amplifying mode or in a non-amplifying mode. | 08-16-2012 |
20120207331 | PREAMPLIFIER CIRCUIT AND MICROPHONE HAVING THE SAME - A preamplifier has first and second PMOS transistors each functioning as a source follower. Furthermore, the preamplifier circuit has third and fourth PMOS transistors functioning in pairs as a differential amplifier. A gate of the first transistor and a gate of the fourth transistor are coupled together through a second variable capacitor. A gate of the second transistor and a gate of the third transistor are coupled together through a first variable capacitor. A source of the first transistor and a drain of the third transistor are coupled together. A source of the second transistor and a drain of the fourth transistor are coupled together. A source of the third transistor and a source of the fourth transistor are coupled together. | 08-16-2012 |
20120230517 | ELECTRONIC DEVICE - An electronic device is provided, including a conductive substrate, an electret diaphragm, a plurality of spacers, a first electrode, and two second electrodes. The conductive substrate has a plurality of openings. The spacers are disposed between the conductive substrate and the electret diaphragm to define an acoustic projecting portion and two acoustic receiving portions on the electret diaphragm. The first electrode is disposed on the acoustic projecting portion and coupled with the conductive substrate for generating an acoustic signal. The second electrodes are disposed on the acoustic receiving portions and coupled with the conductive substrate, wherein the acoustic receiving portions receive the acoustic signal and vibrate to vary an electrical field between the second electrodes and the conductive substrate. | 09-13-2012 |
20120230518 | APPARATUS AND METHOD FOR AMPLIFICATION OF AUDIO CONTENT - There is provided an apparatus and method for amplification of audio content. The apparatus includes a first power line connectable to a first connector of the plurality of data output connectors; a second power line connectable to a second connector of the plurality of data output connectors; an amplifier connected along each of the first and the second power lines; and a coil driver coupled to each of the amplifiers, the coil drivers being arranged such that magnetic summation occurs when the coil drivers are energized. The method also enables magnetic summation to occur when the coil drivers are energized. | 09-13-2012 |
20120237059 | ELECTRONIC APPARATUS - According to one embodiment, an electronic apparatus includes a terminal, an amplifier, a speaker, a power supply circuit, a first switch and a first controller. The terminal configured to input an audio signal from an external device. The amplifier configured to amplify the audio signal which is input from the terminal. The speaker configured to output sound corresponding to the audio signal which is amplified by the amplifier. The power supply circuit connected to the amplifier. The first controller configured to control the power supply circuit in order to supply the power to the amplifier, when the electronic apparatus is in a non-operative state and the first switch is turned on. | 09-20-2012 |
20120257771 | HIGH-EFFICIENCY LOW-VOLTAGE-POWER-SUPPLY HIGH-POWER-OUTPUT AUDIO DRIVER ARCHITECTURE - The present invention discloses a high-efficiency low-voltage-power-supply high-power-output audio driver architecture, including: a multi-coil loudspeaker; and a single-input N-output audio power amplifier configured to amplify a received digital audio signal and to output N switch signals for driving the multi-coil loudspeaker, wherein N represents the number of output channels and is a positive integer greater than or equal to 2. By implementing the above mentioned method, the requirement of the high power output under low voltage input is met; the solution improves the output power by means of combination of coils, and, in cooperation with the unique dynamic power allocation technology, the solution achieves the power balance of the multiple coils, so that the output efficiency of the audio driver is greatly improved. | 10-11-2012 |
20120263323 | AUDIO SIGNAL DRIVER FOR FLAT SOUND GENERATOR - An audio driver for a flat sound generator is coupled to the sound generator. The audio driver includes a power amplifier and an audio-amplifying transformer, the power amplifier receiving an input audio signal and the audio-amplifying transformer transforms the input audio signal into an output audio signal to drive a flat sound generator. The flat sound generator includes a perforated electrode plate and a diaphragm. Wherein, the audio-amplifying transformer and the flat sound generator form a low-pass filter effectively. | 10-18-2012 |
20120263324 | Orientation-Responsive Acoustic Driver Selection - An audio device incorporates a first acoustic driver having a first direction of maximum acoustic radiation and a second acoustic driver having a second direction of maximum acoustic radiation, where the first and second directions of maximum acoustic radiation are not in parallel, and where the audio device employs the first acoustic driver or the second acoustic driver in acoustically outputting a sound of a predetermined range of frequencies in response to the orientation of the casing of the audio device relative to the direction of the force of gravity. | 10-18-2012 |
20120263325 | Orientation-Responsive Acoustic Array Control - An audio device incorporates a plurality of acoustic drivers and employs them to form either a first acoustic interference array generating destructive interference in a first direction from the plurality of acoustic drivers or a second acoustic interference array generating destructive interference in a second direction from the plurality of acoustic drivers in response to the orientation of the casing of the audio device relative to the direction of the force of gravity. | 10-18-2012 |
20120269365 | ACOUSTIC APPARATUS, ACOUSTIC SYSTEM, AND AUDIO SIGNAL CONTROL METHOD - An acoustic apparatus includes: a first amplification unit; and an audio signal control unit that controls an audio signal input to the first amplification unit, wherein if a second amplification unit is connected to an output of the first amplification unit, a level control of the audio signal by the audio signal control unit is terminated. | 10-25-2012 |
20120308050 | EFFICIENCY OPTIMIZER OF AN AUDIO POWER AMPLIFIER FOR CAR RADIO - The present invention concerns an audio amplifier circuit designed to provide an output signal to an audio transducer, said audio amplifier circuit comprising an audio power amplifier designed to receive an audio signal and designed to generate said output signal, a sensor designed to detect an audible sound having at least one noise component, to generate a detected signal. The audio amplifier circuit also includes a processing block configured to receive said detected signal at its input and to generate an off signal at its output, the latter being located at the input of said audio power amplifier. The processing block processes the detected signal according to said input signal to identify said noise component of said detected signal to generate a reference signal. The processing block generates the off signal when the value of said input signal is lower than the value of said reference signal. | 12-06-2012 |
20120308051 | METHOD AND ARRANGEMENT FOR DRIVING A MICROPHONE - Disclosed is a differential microphone pre-amplifier circuit ( | 12-06-2012 |
20120321106 | CONDENSER MICROPHONE - A condenser microphone includes: a true condenser microphone (TCM) pickup operable to generate an input signal at a high impedance corresponding to sound picked up thereby; an impedance conversion circuit connected electrically to the TCM pickup, and operable to convert the input signal from the TCM pickup to a converted signal at a low impedance; an amplifier circuit connected electrically to the impedance conversion circuit, disposed to receive a power signal, and operable for amplifying the converted signal so as to generate an output signal; and a phantom voltage module connected electrically to the TCM pickup, disposed to receive the power signal, and operable for generating a phantom signal from the power signal, the phantom signal having a voltage higher than that of the power signal and being provided to the TCM pickup for charging the TCM pickup. | 12-20-2012 |
20130003994 | DIGITAL AMPLIFIER - The disclosed digital amplifier ( | 01-03-2013 |
20130022219 | VOICE COIL SPEAKER - There is provided a voice coil speaker containing a bobbin having multilayer voice coils formed thereon in which the bobbin and a circuit board are properly arranged. In a voice coil speaker equipped with a bobbin having multilayer voice coils formed thereon and a diaphragm connected to the bobbin, the bobbin and the diaphragm being provided in a speaker body, an audio signal processing circuit board for processing an audio signal is disposed ahead of the diaphragm, and plural output terminals for outputting to the multilayer voice coils are arranged in the peripheral direction of the audio signal processing circuit board. | 01-24-2013 |
20130028448 | AUDIO SIGNAL PROCESSING METHOD AND AUDIO SIGNAL PROCESSING APPARATUS THEREFOR - An audio signal processing apparatus and method are provided. The apparatus includes a stability determiner and a sigma-delta modulator. The stability determiner divides a frequency band of an input audio signal into one or more sub-frequency bands, compares a level of the input audio signal for each of the sub-frequency bands with a threshold for the sub-frequency band, and generates a stability determination signal according to a result of the comparison. The sigma-delta modulator sigma-delta modulates the input audio signal according to the stability determination signal, and outputs a modulation signal. | 01-31-2013 |
20130034248 | AUDIO RECORDING AND PLAYBACK DEVICE, AND POWER FEED METHOD FOR AUDIO RECORDING AND PLAYBACK DEVICE - An audio recording and playback device, of the present invention, capable of recording and playing back audio, comprises an audio input section for converting audio input during an audio recording operation into an electrical audio signal, a power feed section for carrying out power feeds to the audio input section by means of a balanced transmission line, an amplifier section for amplifying the audio signal, a boost section for generating a power feed voltage to be applied to the balanced transmission line and outputting to the power feed section, a output voltage changing section for carrying out control to vary the output voltage of the boost section, and a control section for controlling the power feed voltage of the power feed section by controlling the power feed section and the output voltage changing section. | 02-07-2013 |
20130034249 | SOLID STATE AUDIO POWER AMPLIFIER - A solid-state audio power amplifier providing an instantaneous maximum output voltage capability in excess of its long term power output capability, in which the input signal is supplied from analogue or digital signal processor. The signal processor is arranged to limit the long term power output of the solid-state amplifier in a non-linear amplitude and frequency dependant manner | 02-07-2013 |
20130034250 | AMPLIFIER - Disclosed is an amplifier with which output signal distortion can be reduced, and deterioration in power efficiency can be reduced. The amplifier is provided with a power supply voltage control unit ( | 02-07-2013 |
20130039515 | SPEAKER COMPONENT, SPEAKER USING SAME, ELECTRONIC APPARATUS, AND MOVING MEANS - Provided is a speaker diaphragm or a speaker voice coil bobbin manufactured by a papermaking method and including metal hydroxide by at least an amount of 30 wt % or greater. With this, it is possible to improve rigidity and achieve favorable acoustic quality by an effect of mixing metal hydroxide. Moreover, it is possible to provide a paper-made diaphragm or a voice coil bobbin with flame retardancy without increasing weight or cost. | 02-14-2013 |
20130058504 | MULTI-MODE AUDIO AMPLIFIERS - A multimode audio amplifier comprises: a mode controller adapted to provide a control signal; and at least one multimode module, wherein each of the multimode modules has a plurality of operating modes, wherein the operating modes are selected in accordance with the control signal, wherein changing the operating modes results in a measurable change in at least one characteristic of the multimode audio amplifier; wherein the characteristics of the multimode audio amplifier consist of signal to noise ratio (SNR); total harmonic distortion and noise (THD+N); input to output delay; power consumption; and efficiency. | 03-07-2013 |
20130058505 | CIRCULAR LOUDSPEAKER ARRAY WITH CONTROLLABLE DIRECTIVITY - The invention relates to a sound-emitting device with controllable directivity comprising a plurality of sound sources ( | 03-07-2013 |
20130064397 | MICROPHONE AMPLIFIER - A microphone amplifier comprises a microphone terminal for connecting a microphone, particularly a MEMS microphone, and an amplifier circuit with an amplifier input that is connected to the microphone terminal, and with an amplifier output that is connected to an output of the microphone amplifier. The amplifier circuit is designed to amplify an input signal present at the amplifier input in order to generate an output signal at the amplifier output. The microphone amplifier further comprises an overload circuit that is designed to detect an overload state within the amplifier circuit and to connect the amplifier input via a switching element, in particular with a low impedance, to a reference potential terminal if the overload state is detected for more than a predetermined time span. | 03-14-2013 |
20130064398 | Class-AB/B amplifier with quiescent control circuit - Disclosed is a Class-AB/B amplifier comprising a first output stage including a first plurality of amplification devices and a second output stage including a second plurality of amplification devices. According to one embodiment, the first output stage operates when the Class-AB/B amplifier is in a quiescent state and the second output stage operates when the Class-AB/B amplifier is in an active state. The Class-AB/B amplifier also comprises a level shifting circuit that adjusts a control voltage of the second output stage, where the level shifting circuit is adapted to activate the second output stage when the Class-AB/B amplifier enters the active state. Embodiments of the Class-AB/B amplifier may include a level shifting circuit that implements either a fixed or signal-dependent level shift, and a quiescent control circuit that substantially eliminates any systematic offset arising from the active feedback circuit inside the replica bias circuit. | 03-14-2013 |
20130077806 | AMPLIFIER APPARATUS - Disclosed is a technique for reducing noise superimposed on an output signal while keeping loop gain constant without increasing the circuit scale and without changing the transfer function of the amplifier apparatus (frequency characteristics of gain and phase). According to the technique, there are included a power-supply voltage control unit | 03-28-2013 |
20130083947 | AUDIO AMPLIFIER - An audio amplifier may comprise a signal limiting circuit and a power amplifier. The signal limiting circuit may be configured to limit an audio signal received at an input and to provide it as a limited audio signal at an output. The power amplifier may have a supply connection which may be coupled to a power supply unit in order to supply power to the power amplifier. The power amplifier may be configured to amplify a signal, which may be based on the limited audio signal, and to provide it as a level-limited audio signal at an output which may be coupled to a load, so that the load may be operated at limited power. The signal limiting circuit may be configured to produce an audio signal which may be limited depending on the load. | 04-04-2013 |
20130089223 | Output Power Limiter in an Audio Amplifier - An output power limiter system (PLS) for audio amplifiers may be designed as a feedback control system for protection of the load and/or quality of the audio experience. The PLS may use comparator to sense the output current, compare it to a specified threshold, and assert a signal when the output current reaches and exceeds the specified threshold. The output signal from the comparator may enable a counter that is clocked with a high frequency clock to begin counting to measure the pulse-width of the comparator output. The output of the counter may be averaged through a fast attack and slow release infinite impulse response (IIR) filter having programmable settings to generate a rate of attenuation or rate of release that adjusts a gain correction in terms of decibels (dB). The output of the IIR filter may then be used for attenuating the output current. | 04-11-2013 |
20130094673 | METHOD AND APPARATUS FOR OUTPUTTING AUDIO SIGNAL - An apparatus for outputting an audio signal with improved sound quality is provided. The apparatus includes a modulation and amplification unit for pulse modulation and switching amplification of an input audio signal and generating an amplified signal which corresponds to the input audio signal; and a vacuum tube amplification unit for inputting a vacuum tube signal generated by attenuating the amplified signal and adding harmonics of a vacuum tube to the amplified signal, to the modulation and amplification unit to provide a mellow sound. | 04-18-2013 |
20130108080 | Audio Output Amplifier | 05-02-2013 |
20130156230 | WAVEFORM SHAPING FOR AUDIO AMPLIFIERS - Techniques for applying waveform shaping to DC-to-DC level transitions in an audio amplifier. In an aspect, a waveform shaping block may utilize a non-linear shaping waveform such as a Gaussian waveform, raised-cosine waveform, root-raised cosine waveform, etc., to shape the transition between two DC levels in an audio amplifier output. The waveform shaping techniques may be utilized, e.g., during power-up or power-down of the amplifier, or in an impedance measurement mode, to reduce audio artifacts associated with the transition while minimizing overall transition time. | 06-20-2013 |
20130156231 | DIGITAL/ANALOGUE CONVERSION APPARATUS - A digital/analog conversion apparatus to convert a digital signal into an analog signal. The digital/analog conversion apparatus can generate a high-quality analog signal, even when elements configuring the digital/analog conversion apparatus have variance, with high resolution and a small circuit size. The data conversion apparatus is provided with a first data converter to reduce the number of bits of an input signal, a second data converter to convert the format of the first output signal, and a third data converter for conversion into a code which corresponds to the history of the output from the second data converter. | 06-20-2013 |
20130163787 | Electronically Orbited Speaker System - Exemplary embodiments are directed to a sound modification system and loud speaker system. The system may impose amplitude and frequency modulation on to a signal representing the output of an electrical musical instrument or other sound source while also imposing a sense of movement of the sound to the listener. Further, the system may simultaneously amplify sound signals without the amplitude, frequency and spatial sense of modulation or a different sense of modulation. The system combines a plurality of speaker transducers, a plurality of amplifiers and digital signal processors to provide a flexible, portable and practical sound modification and amplification system. | 06-27-2013 |
20130163788 | POWER SUPPLY CIRCUITS FOR AUDIO AMPLIFIERS - Several amplifier power circuits and methods for powering an audio amplifier are described. An AC line voltage is rectified and selectively coupled to a filter capacitor in response to a switch control signal. The filter capacitor is charged to generate an amplifier supply voltage signal, which is used to power the audio amplifier. A controller generates the switch control signal in accordance with a leading control approach or a lagging control approach. | 06-27-2013 |
20130163789 | AMPLIFIER AND AMPLIFYING METHOD - An amplifier that modulates a carrier frequency according to a digital signal and amplifies the modulated signal includes a determining portion that determines at least one of a sound quality required for the digital signal, a sound source of the digital signal, and a type of sound of the digital signal, a carrier frequency setting portion that sets a carrier frequency according to a result of the determination, and a pulse-width modulating portion that pulse-width modulates the carrier frequency according to the digital signal. | 06-27-2013 |
20130177175 | POWER EFFICIENCY IMPROVEMENT OF AN AUDIO AMPLIFIER BY ADAPTIVE CONTROL OF A CHARGE PUMP - A control circuit and method for an audio amplifier detect a signal for driving a speaker to control the switching frequency and the operation mode of a charge pump in the audio amplifier, to improve power efficiency of the audio amplifier. Preferably, a digital interface is further used to test the magnitude of the output signal of the audio amplifier, to reduce the costs of analog test. The charge pump has fewer switches and thus saves costs and die area of an integrated circuit. The control method needs only two phase control for the charge pump to generate a positive voltage and a negative voltage, and thus simplifies the operation of the circuit. | 07-11-2013 |
20130195289 | POWER AMPLIFYING APPARATUS AND AUDIO SYSTEM - The power amplifying apparatus includes a first comparator that compares the first detection signal and the fourth detection signal and outputs a first comparison signal depending on whether or not a difference between the first current and the fourth current is equal to or greater than a first predetermined value. The power amplifying apparatus includes a second comparator that compares the second detection signal and the third detection signal and outputs a second comparison signal depending on whether or not a difference between the second current and the third current is equal to or greater than a second predetermined value. | 08-01-2013 |
20130208922 | Integrated Amplifier for Driving Acoustic Transducers - The invention relates to an electronic integrated amplifier for driving an acoustic transducer. The amplifier comprises two differential input terminals to receive an input signal and a first and a second output terminal to provide an output signal to the transducer. In addition, the amplifier comprises an operational amplifier having an input end including differential inputs and an output end operatively associated with the first and second output terminals. A pair of input resistors connect the two differential input terminals to two intermediate terminals, respectively. A pair of feedback resistors connect the first and second output terminals to the two intermediate terminals, respectively. The integrated amplifier also comprises means for high-pass filtering the input signal. Such filtering means is characterized in that it comprises an input element interposed between said intermediate terminals and the input end of the operational amplifier, and a feedback element connected between the input end and the output end of the same operational amplifier. | 08-15-2013 |
20130223650 | DC-DC CONVERTER AND AUDIO OUTPUT UNIT - A DC-DC converter includes a first capacitor which can be charged by a power-supply voltage; a second capacitor that generates the output voltage using electric charge previously discharged by the first capacitor; a comparator that compares the output voltage with a reference voltage and outputs a comparison signal that shows whether the output voltage is below the reference voltage; multiple switches that switch to allow the first capacitor either to be charged or to discharge its charge to the second capacitor, and a controller that controls the switch timing of the multiple switches on the basis of the comparison signal. | 08-29-2013 |
20130223651 | AUDIO AMPLIFIER USING MULTI-LEVEL PULSE WIDTH MODULATION - The present invention relates in one aspect to a class D audio amplifier with improved output driver topology supporting multi-level output signals such as 3-level, 4-level or 5-level pulse width or pulse density modulated output signals for application to a loudspeaker load. The present class D audio amplifiers are particularly well-suited for high-volume consumer audio applications and solutions. | 08-29-2013 |
20130236034 | AUDIO OUTPUT CIRCUIT, ELECTRONIC DEVICE USING THE SAME, AND AUDIO INTEGRATED CIRCUIT - An audio output circuit for driving an electro-acoustic transducer includes first and second D-class amplifiers, a pulse modulator to receive an audio signal and generate first and second pulse signals for driving first and second D-class amplifiers, first and second drivers to drive first and second D-class amplifiers in response to first and second pulse signals, respectively, a common mode choke coil, and a delay setting circuit to apply a relative delay to output signals of the first and second D-class amplifiers | 09-12-2013 |
20130243223 | AUDIO SIGNAL PROCESSING CIRCUIT, CAR AUDIO APPARATUS USING THE SAME, AUDIO COMPONENT APPARATUS, ELECTRONIC DEVICE AND OUTPUT AUDIO SIGNAL GENERATING METHOD - An audio signal processing circuit includes a first amplifier to generate a first analog audio signal; a second amplifier to generate a second analog audio signal; an analog/digital converter to generate a first digital audio signal; a digital signal processing unit to output a second digital audio signal; a digital/analog converter to generate differential third analog audio signals; a third amplifier for inverting a positive signal of the third analog audio signals and adding it to a negative signal to generate a single-ended fourth analog audio signal; and a fourth amplifier to generate an output audio signal. | 09-19-2013 |
20130259266 | ELECTRONIC DEVICE AND AUDIO PROCESSING CIRCUIT - A display device has an audio amplifier which amplifies and outputs an audio signal, and first and second isolation transformers which are provided in an electric power transmission path between a power source, which supplies electric power to the display device, and the audio amplifier. | 10-03-2013 |
20130259267 | AUDIO AMPLIFIER APPARATUS - An audio amplifier apparatus for driving a loudspeaker is provided. The audio amplifier apparatus includes a soft charge unit, a first amplification module, and a second amplification module. The soft charge unit is coupled to the loudspeaker through an output terminal and supplies a driving current according to a first control signal to soft charge the loudspeaker, so as to gradually increase a voltage level on the output terminal. The first amplification module receives an audio signal according to the first control signal and amplifies the audio signal to output a first amplified signal for driving the loudspeaker. The second amplification module receives the audio signal according to a second control signal and amplifies the audio signal to output a second amplified signal for driving the loudspeaker. The soft charge unit generates the second control signal by comparing the voltage level on the output terminal with a predetermined voltage level. | 10-03-2013 |
20130259268 | Speaker System and Method for Driving Same - Disclosed is a speaker system. The speaker system includes a multimedia unit including a plurality of speaker units, a resonance medium for supporting the multimedia unit, a number of low frequency vibrators assembled with the multimedia unit and located between the multimedia unit and the resonance medium, a driving unit for providing high frequency audio signals to the speaker units and low frequency audio signals to the low frequency vibrators. A resonance member is formed by the low frequency vibrators and the resonance medium for producing low frequency sound. | 10-03-2013 |
20130266156 | SENSOR AMPLIFIER ARRANGEMENT AND METHOD FOR AMPLIFICATION OF A SENSOR SIGNAL - A sensor amplifier arrangement includes an amplifier having a signal input to receive a sensor signal and a signal output to provide an amplified sensor signal, and a feedback path that couples the signal output to the signal input and provides a feedback current that is an attenuated signal of the amplified sensor signal and is inverted with respect to the sensor signal. | 10-10-2013 |
20130266157 | HEADPHONE AMPLIFIER - Aspects of the disclosure process an amplifier circuit. The amplifier circuit includes an input stage, an intermediate stage, an output stage and a detecting and controlling circuit. The input stage is configured to receive an electrical signal for amplification. The intermediate stage is configured to amplify with an adjustable gain. The output stage is configured to drive an audio output device in response to the amplified electrical signal. The detecting and controlling circuit is configured to detect a current for driving the audio output device, and adjust the gain of the intermediate stage based on the current to compensate for a pole change of the amplifier circuit due to a change of the current. | 10-10-2013 |
20130266158 | CLASS-D AMPLIFIER WITH PULSE DENSITY MODULATION OUTPUT FEEDBACK FOR HIGHER PERFORMANCE ACOUSTIC ECHO CANCELLER - A system for processing audio data comprising an amplifier configured to receive an audio signal and to perform nonlinear processing on the audio signal. An encoder coupled to the amplifier, the encoder configured to receive the nonlinearly processed audio signal and to encode the nonlinearly processed audio signal into a data transmission format. A transmitter configured to receive and transmit the encoded nonlinearly processed audio signal. A receiver configured to receive the transmitted encoded nonlinearly processed audio signal and to decode the encoded nonlinearly processed audio signal. A digital voice processor configured to receive the nonlinearly processed audio signal and to use the nonlinearly processed audio signal for echo estimation and to subsequently subtract the estimated echo signal from a microphone signal. | 10-10-2013 |
20130272545 | MULTI-STAGE AMPLIFIER WITH PULSE WIDTH MODULATION (PWM) NOISE SHAPING - A pulse width modulation (PWM) amplifier includes a first amplifier stage, a second amplifier stage, and a gain module. The first amplifier stage is configured to amplify an analog input signal in the analog and digital domains using a first pulse width modulation (PWM) generator, to provide a first stage output for coupling to a load. The gain module is configured to amplify a quantization error of the first PWM generator by a predetermined gain. The second amplifier stage is configured to spectrally shape and attenuate the amplified quantization error of the first PWM generator using a second PWM generator, to provide a second stage output for coupling to the load. | 10-17-2013 |
20130272546 | METHODS AND APPARATUS FOR HEAD-WEARABLE PERSONAL SOUND SPEAKER SYSTEMS - The invention provided a visor including a headband including an adjustable strap; a bill attached to the headband and including an flexible fabric sound speaker integrally formed within the bill; an amplifier including a signal input, the amplifier removeably attached to the headband and coupled to the speaker; and a power supply removeably attached to the headband and coupled to the amplifier. Numerous additional features are disclosed. | 10-17-2013 |
20130272547 | Adaptive Rail Power Amplifier Technology - Adaptive rail power amplifier technology processes an audio signal by feeding the audio signal to the power amplifier to produce an output signal, applying positive and negative power supply voltages centered with respect to the audio signal to the positive and negative power supply rails of the power amplifier, comparing the output signal with the positive and negative power supply rail voltages to produce dynamically varying positive and negative control signals, feeding the positive and negative control signals to positive and negative high current charge pumps and adding supplemental positive and negative voltages from the positive and negative charge pumps to the positive and negative power supply rails to produce a linear adaptive rail voltage which tracks the output signal. | 10-17-2013 |
20130301854 | AUDIO AMPLIFIER - An audio amplifier includes a compensation unit, an output unit and a calibration unit. The compensation unit generates a compensation signal based on a digital input signal, a digital reference code, a mode signal and a digital approximation code. The output unit generates an output signal based on the compensated input signal. The calibration unit generates the digital approximation code based on the output signal and the mode signal. The digital approximation code includes a plurality of bits that are generated sequentially. | 11-14-2013 |
20130308795 | INTERFACE CIRCUIT FOR CONNECTING A MICROPHONE CIRCUIT TO A PREAMPLIFIER - An interface circuit is provided that is adapted to connect a microphone circuit to a preamplifier. The microphone circuit has a microphone and at least an output node and the preamplifier has at least an input node connected to the output node by the interface circuit. The interface circuit has at least a decoupling capacitor for DC decoupling the input node from the output node. The decoupling is connected between the input node and the output node. The interface circuit has at least one active circuit, comprising a resistor connected the decoupling capacitor. The resistor acts as part of a resistance multiplier and has an equivalent resistance that together with the decoupling capacitor defines a high-pass filter connected between the microphone and the preamplifier. The interface circuit may also have a biasing circuit connected to the resistor. | 11-21-2013 |
20130322656 | LOUDSPEAKER SYSTEM - Provided are loudspeaker systems. Embodiments include a first speaker to provide a direct radiating output from the front of the loudspeaker system and a second speaker to drive a ported side chamber of the loudspeaker system, wherein the first and second speakers share a ported common chamber, and wherein at least one port of the ported common chamber exits the front of the loudspeaker system. In one embodiment, the common chamber includes at least one port that is substantially aligned with the front of the loudspeaker system. In another embodiment, each speaker is coupled to a separate amplifier and signal processing unit. | 12-05-2013 |
20130322657 | PARAMETRIC TRANSDUCER SYSTEM AND RELATED METHODS - A method of optimizing a parametric emitter system having a pot core transformer coupled between an amplifier and an emitter, the method comprising: selecting a number of turns required in a primary winding of the pot core transformer to achieve an optimal level of load impedance experienced by the amplifier; and selecting a number of turns required in a secondary winding of the pot core transformer to achieve electrical resonance between the secondary winding and the emitter. | 12-05-2013 |
20130329914 | METHOD AND SYSTEM OF AUDIO CAPTURE BASED ON LOGARITHMIC CONVERSION - Audio capture based on logarithmic conversion. At least some of the illustrative embodiments are methods including capturing audio represented by an electrical signal, the electrical signal having both positive voltage portions and negative voltage portions. In some cases, the capture is by: performing logarithmic analog-to-digital conversion on the positive voltage portions to create a first plurality of digital values; and performing logarithmic analog-to-digital conversion on the negative voltage portions to create a second plurality of digital values; and storing representations of the first and second plurality of digital values to a storage medium. | 12-12-2013 |
20130343577 | Audio Visual Enhancement Apparatus - An apparatus of the present disclosure enhances the audio/visual experience of a portable digital device, and comprises a lens positioning slot, a lens storage compartment, a passive audio amplifier, a receiving station. | 12-26-2013 |
20140010385 | Differential Amplifier - An amplifier for amplifying a differential audio signal, having common-mode rejection and digital gain control, includes a current source ( | 01-09-2014 |
20140010386 | AMPLIFIER CIRCUIT FOR A TWO-WIRE INTERFACE - The invention relates to an amplifier circuit ( | 01-09-2014 |
20140037112 | DIGITAL CONDENSER MICROPHONE HAVING PREAMPLIFIER WITH VARIABLE INPUT IMPEDANCE AND METHOD OF CONTROLLING VARIABLE INPUT IMPEDANCE OF PREAMPLIFIER - The present invention provides a digital condenser microphone having a preamplifier with variable input impedance and a method of controlling the variable input impedance of the preamplifier. The preamplifier includes a bias terminal (Bias) for applying a bias voltage to an input signal when the input signal is output from a microphone condenser. An impedance unit (Z) includes at least one variable input impedance element which is connected to the bias terminal and to which the bias voltage is applied via the bias terminal. An operational amplifier receives the input signal, converts the input signal into an output signal, and outputs the output signal. A control block ( | 02-06-2014 |
20140037113 | PREAMPLIFIER CIRCUIT FOR A MICROELECTROMECHANICAL CAPACITIVE ACOUSTIC TRANSDUCER - Described herein is a preamplifier circuit for a capacitive acoustic transducer provided with a MEMS detection structure that generates a capacitive variation as a function of an acoustic signal to be detected, starting from a capacitance at rest; the preamplifier circuit is provided with an amplification stage that generates a differential output signal correlated to the capacitive variation. In particular, the amplification stage is an input stage of the preamplifier circuit and has a fully differential amplifier having a first differential input (INP) directly connected to the MEMS detection structure and a second differential input (INN) connected to a reference capacitive element, which has a value of capacitance equal to the capacitance at rest of the MEMS detection structure and fixed with respect to the acoustic signal to be detected; the fully differential amplifier amplifies the capacitive variation and generates the differential output signal. | 02-06-2014 |
20140050335 | Very High Fidelity Audio Amplifier - This high fidelity audio amplifier with very low distortion and high efficiency ( | 02-20-2014 |
20140050336 | Audio Amplification Apparatus - An audio amplification apparatus for attachment to a device having a loudspeaker. The apparatus ( | 02-20-2014 |
20140050337 | PERSONAL COMPUTER TO OUTPUT AUDIO IN A NON-OPERATIVE STATE - According to one embodiment, an electronic apparatus includes a terminal, an amplifier, a speaker, a power supply circuit and a first controller. The terminal configured to input an audio signal from an external device. The amplifier configured to amplify the audio signal. The speaker configured to output sound corresponding to the audio signal which is amplified by the amplifier. The power supply circuit configured to supply power to the amplifier. The first controller configured to control the power supply circuit to continue the supply of the power, when the electronic apparatus is in a non-operative state. | 02-20-2014 |
20140056442 | SWITCHING MODE AMPLIFIER OPERATION - A switching mode amplifier and method. A voltage divider comprising two series connected reactive components produces, on a center line, a fraction of a voltage received on a first line and a second line. The switching structure produce a fraction of the power supply voltage to the first port or the second port by either one of 1) a first configuration that connects the first port to the first input and the second port to the center line, or 2) a second configuration that connects the first port to the center line and the second port to the second input. A controller responds to a sequence of commands to provide the fraction of the voltage by alternating the switching structure between the first configuration and the second configuration. | 02-27-2014 |
20140056443 | Audio Amplifier for Portable Devices - An audio amplifier for portable devices is provided, which includes a hollow or a solid shell body and an inner container receiving in the shell body, a large opening for sound transmission is defined on the front of the shell body, and a groove is disposed on the top of the shell body, a sound absorbing aperture is defined at the bottom of the groove, the inner container comprises a curve-shaped pipeline which extends inwards from the sound absorbing aperture to the shell body until arriving the large opening for sound transmission, and the width of the curve-shaped pipeline is increased gradually as the curve-shaped pipeline extends inwards. | 02-27-2014 |
20140056444 | AMPLIFYING DEVICE - An amplifying device is provided that reduces power consumption and quickly starts amplification of an audio signal of a channel to be used. A control section | 02-27-2014 |
20140064520 | TERMINAL WITH A PIEZOELECTRIC SPEAKER SYSTEM AND METHOD FOR OPERATING THEREOF - A terminal having a piezoelectric speaker system includes a control unit to generate a sound source signal, a first amplification unit to provide a voltage to amplify the sound source signal, and a piezoelectric module to vibrate according to the amplified sound source signal, the piezoelectric module being configured to transmit vibrations to a contact medium to generate a sound. A method for generating a sound using a piezoelectric speaker includes amplifying a sound source signal, generating a vibration in a piezoelectric module according to the amplified sound source signal, and transmitting vibration to a contact medium for generating the sound. | 03-06-2014 |
20140064521 | ELECTRICAL SYSTEM FOR A SPEAKER AND ITS CONTROL - An electrical apparatus includes a frame, a speaker connected to the frame, a digital signal processor in communication with the speaker to receive audio data and control data to control the speaker, the digital signal processor connected to the frame, and a lamp base coupler electrically connected to the speaker and receiver, the lamp base coupler detachably connectable to a power source, when the power source is present. A method of steering the diffused sound field includes, broadcasting at least one calibration audio signal through a plurality of speakers (M) in an audio system, receiving the calibration audio signal in a plurality of microphones spaced apart and positioned about at a listening position, and calculating respective relative speaker placement angles relative to the listening position between each of the plurality of speakers in response to receipt of the calibration audio signal in the plurality of microphones. | 03-06-2014 |
20140079249 | SPEAKER CONTROL SYSTEM - A speaker control system includes a speaker; an audio amplifier electrically connected to the speaker and used for driving the speaker, the audio amplifier having a shutdown pin and a reference voltage input pin; a switch circuit, a first end of the switch circuit being electrically connected to the shutdown pin and a second end of the switch circuit being connected to the reference voltage input pin; and a processor electrically connected to the shutdown pin and the first end, when the processor outputs a first voltage signal, the audio amplifier being enabled and the reference voltage input pin being kept at a reference voltage, when the processor outputs a second voltage signal, the audio amplifier being disabled and the switch circuit switching the reference voltage input pin from the reference voltage to a low voltage level. | 03-20-2014 |
20140093103 | INCREASING GROUND NOISE REJECTION IN AUDIO SYSTEMS - An audio source device has an audio connector to which an external load can be connected. An audio signal is amplified and then driven through the connector, wherein the amplification process uses feedback from the return pin of the connector. The return pin is directly connected to a ground break resistor circuit. The ground break resistor circuit is connected between the return pin of the audio connector and circuit ground. A determination is made as to whether the connected external load has a low impedance or a high impedance. When a low impedance load is detected, such as a headset, the ground break resistor circuit is essentially short-circuited. When a high impedance load is detected, the ground break resistor circuit is maintained and its value is set in accordance with the detected load. Other embodiments are also described. | 04-03-2014 |
20140093104 | CLASS-G AMPLIFIER AND AUDIO SYSTEM EMPLOYING THE AMPLIFIER - A Class-G amplifier including a first and second driving transistor configured to receive an input voltage; a first supplying terminal connected to the first driving transistor to supply a first supplying voltage. The amplifier also comprises: a second supplying terminal connected to the second driving transistor to supply a second supplying voltage in absolute value higher than said first voltage; a first power transistor connected to the first driving transistor to form a first Sziklai pair structured to be activated by a first input voltage lower in absolute value than the first supplying voltage; a second power transistor connected to the second driving transistor to form a second Sziklai pair structured to be activated by an input signal comprised between the first supplying voltage and the second supplying voltage. | 04-03-2014 |
20140098976 | SPEAKER SYSTEM AND METHOD FOR ADJUSTING POWER OF SPEAKER - An exemplary speaker system includes a speaker, an audio amplifier, a detecting resistor, and a control unit. The audio amplifier is connected to the speaker and outputs a working voltage to the speaker. The detecting resistor is electronically connected between the speaker and the audio amplifier. The control unit is connected between the detecting resistor and the audio amplifier. The control unit detects a voltage of the detecting resistor, calculates a real-time power of the speaker, and compares the real-time power with a rated power of the speaker. When the real-time power equals to or exceeds the rated power, the control unit adjusts the working voltage until the real-time power is below the rated power. | 04-10-2014 |
20140105425 | Acoustic Amplification Device - An amplification device amplifies sound waves that emit from a portable electronic device. The portable electronic device joins the amplification device at a horizontal orientation that is efficacious for watching videos in wide screen format. A slot in the amplifying device engages a speaker in the portable electronic device. The amplifying device receives sound waves generated by the speaker at a narrow, speaker receiving end, passes the sound waves through an acoustic channel, and finally emits the sound waves from a wide, amplifying end. Increasing surface area at the wide end of the amplifying device lowers the acoustic impedance, and consequently amplifies the sound waves. The sound waves amplify because acoustic impedance is lowered and matched to the proximate air. A cone-shaped dispersion port positions within the acoustic channel to optimize sound wave dispersion. A housing contains the components and has a sloped surface for supporting chargers. | 04-17-2014 |
20140119573 | System and Method for Capacitive Signal Source Amplifier - In accordance with an embodiment, a system for amplifying a signal provided by a capacitive signal source includes a first voltage follower device, a second voltage follower device, and a first capacitor. The first voltage follower device includes an input terminal configured to be coupled to a first terminal of the capacitive signal source, and the second voltage follower device includes an input terminal coupled to the first output terminal of the first voltage follower device, and an output terminal coupled to a second output terminal of the first voltage follower device. Furthermore, first capacitor has a first end coupled to a first output terminal of the first voltage follower device, and a second end configured to be coupled to a second terminal of the capacitive signal source. | 05-01-2014 |
20140133678 | Circuit Structure For Achieving Adaptive Function In Class-D Audio Power Amplifier Circuit - Disclosed is a circuit structure for implementing an adaptive function in a class-D audio power amplifier circuit, comprising an operation amplifier, a pulse width modulator and a driver stage that are sequentially and serially connected, an input terminal of the operation amplifier being connected to an external audio signal output terminal, and an output terminal of the driver stage being connected to a loudspeaker and connected to the input terminal of the operation amplifier via a feedback loop. The circuit structure further comprises: one or a plurality of a carrier adaptive circuit, a frequency adaptive circuit, a driver adaptive circuit, a temperature adaptive circuit. | 05-15-2014 |
20140140540 | Discrete lateral MOSFET power amplifier expansion card - The teachings are directed to a power amplifier expansion card (“amplifier card”) for a computer. The amplifier card receives audio data through an input port and amplifies the audio data to high-level passive speaker power for transmissions through an output port. The amplifier card can comprise a circuit board having (i) at least two audio channels; (ii) an audio power amplification circuit for amplifying audio power to at least 20 W RMS per channel; and (iii) an onboard cooling system. The amplifier card can be used, for example, in a multimedia system having at least a studio controller operably connected to the amplifier card for receiving and processing input audio data. Examples of such multimedia systems include, but are not limited to, a television home entertainment system, an audio home entertainment system, a music production studio system, a gaming system, a personal computing system, or any combination thereof. | 05-22-2014 |
20140140541 | Adaptive High Fidelity Reproduction System - Audio is adaptively associated with speakers, depending on the speaker configuration that is present. Each speaker it receives an audio assignment based on its individual spectral characteristics. As more speakers are added, content is adaptively associated with that you speaker, and taken away from the previous. | 05-22-2014 |
20140153746 | Microphone Preamplifier Circuit - A microphone preamplifier circuit ( | 06-05-2014 |
20140169588 | Boosted Differential Class H Amplifier - A differential audio amplifier system and a related system to generate an output signal free or with only very limited clipping are disclosed. It provides a solution to solve the problem of limited electrical speaker amplifier output power available (e.g. inside battery driver applications). A differential speaker amplifier has positive and negative supply rails. In a first embodiment of the disclosure the negative supply rail is connected to the output of an inverting buck-boost converter and the positive supply rail is directly connected to VSS voltage. In a second embodiment of the disclosure the positive supply rail is connected to the output of a buck-boost converter and the negative supply rail is directly connected to a positive battery voltage. | 06-19-2014 |
20140169589 | AMPLIFIER APPARATUS WITH CONTROLLED NEGATIVE OUTPUT IMPEDANCE - An audio amplifier apparatus includes an audio amplifier which receives a single audio signal and produces a plus phase audio signal and a minus phase audio signal, both dependent upon the single audio signal. The plus phase audio signal and minus phase audio signal are received by first and second inputs of a speaker, respectively. A current sensing circuit senses a level of current received by the first or second inputs of the speaker and outputs a current sensing signal dependent upon the sensed level of current. An amplifying circuit receives and amplifies the current sensing signal. A mixer circuit receives the amplified current sensing signal and an audio drive signal and produces the single audio signal dependent upon the amplified current sensing signal and the audio drive signal. The single audio signal is produced at a node in-between two resistors. | 06-19-2014 |
20140177875 | Method and apparatus for switching between a directly connected an a networked audio source - A system is described for maintaining synchrony of operations among a plurality of devices that have independent clocking arrangements. The system includes a task distribution device that distributes tasks to a synchrony group comprising a plurality of devices that are to perform the tasks distributed by the task distribution device in synchrony. The task distribution device distributes each task to the members of the synchrony group over a network. Each task is associated with a time stamp that indicates a time, relative to a clock maintained by the task distribution device, at which the members of the synchrony group are to execute the task. Each member of the synchrony group periodically obtains from the task distribution device an indication of the current time indicated by its clock, determines a time differential between the task distribution device's clock and its respective clock and determines therefrom a time at which, according to its respective clock, the time stamp indicates that it is to execute the task. | 06-26-2014 |
20140177876 | AUDIO AMPLIFIER PERFORMANCE WHILE MAINTAINING USB COMPLIANCE AND POWER DOWN PROTECTION - An apparatus comprises a first audio amplifier circuit configured to provide an analog audio signal and an analog switch circuit including a first input configured to receive the analog audio signal, a second input configured to receive a first digital data signal, and a first output configured to provide one of the digital data signal or the analog audio signal. The apparatus also includes a first feedback circuit coupled to the first audio amplifier circuit and the analog switch circuit output, the feedback circuit configured to bias the first audio amplifier circuit. | 06-26-2014 |
20140185836 | PULSE WIDTH MODULATOR AND SWITCHING AMPLIFIER - A pulse width modulation signal with a less distortion component that is not influenced by a common-mode noise or an offset voltage is generated. Pulse signal generation circuits | 07-03-2014 |
20140233763 | Amplifier for Electrostatic Transducers - A class D audio amplifier which provides both an alternating signal and a DC bias voltage to an electrostatic transducer ( | 08-21-2014 |
20140254835 | Packaged Microphone System with a Permanent Magnet - A microphone structure has a lid forming an interior chamber. The lid includes a permanent magnet for forming a permanent magnetic field. The microphone structure includes an aperture for permitting acoustic access to the interior of the chamber and thus, the MEMS microphone. The MEMS microphone structure includes a substrate mechanically coupled to an electrically conductive diaphragm. The electrically conductive diaphragm has a first side defining a plane and the diaphragm moves through a range of motion perpendicular the plane of the first side. The permanent magnetic field is perpendicular to the direction of motion of the diaphragm and linear within the range of motion, such that a current will be generated and sensed by sensors within an electric circuit loop that includes the diaphragm. | 09-11-2014 |
20140254836 | PORTABLE ELECTRONIC DEVICE - A portable electronic device having a speaker module is provided. The speaker module includes: a speaker unit; a back chamber; a channel coupled between the speaker unit and the back chamber; and a porous material filled inside at least a portion of the front chamber, the back chamber, and/or the channel, for improving and extending bass performance and relieving a channel effect caused by the channel. Moreover, the portable electronic device is advantageously able to compensate a resonance degradation caused by the porous material. | 09-11-2014 |
20140254837 | INTEGRATED AUDIO AMPLIFICATION CIRCUIT WITH MULTI-FUNCTIONAL EXTERNAL TERMINALS - An audio amplification circuit may include an input terminal for receipt of an input signal from a transducer. A signal processor may be coupled to the input terminal for receipt and processing of the input signal to generate a processed digital audio signal in accordance with a programmable configuration setting of the signal processor. A serial data transmission interface is configured for receipt of the processed digital audio signal and supply of a corresponding digital audio stream at an output terminal of the integrated audio amplification circuit. A serial data receipt interface may be coupled to an externally accessible configuration terminal of the integrated audio amplification circuit and a controller is configured to adjust one of the programmable configuration setting of the signal processor and a format of a digital audio stream in accordance with first configuration data received through the serial data receipt interface. | 09-11-2014 |
20140270264 | MULTIFUCTIONAL LED DEVICE AND A MULTIFUNCTIONAL SPEAKER SYSTEM - Embodiments consistent with the present disclosure provide a multifunctional LED device and a multifunctional speaker system. The multifunctional LED device includes a power supply unit configured to supply power; a control unit configured to process audio signals and control signals; a speaker configured to play audio signals, an audio power amplifier configured to drive the speaker, a wireless transceiver configured to receive and send data, and an LED lighting unit. Further, the wireless transceiver may communicate with both remote smart terminals and other multifunctional LED devices. The multifunctional speaker system may include several multifunctional LED devices and a smart terminal. The smart terminal may communicate with all the multifunctional LED devices. The multifunctional LED devices may communicate with each other. Two of the multifunctional LED devices may form a 2.0-channel speaker system. Other speaker systems such as 2.1-channel, 5.1-channel, 7.1-channel, speaker systems etc., may also be realized by using more multifunctional LED devices. Embodiments consistent with the present disclosure are easy to install, require little wiring, and do not require adding a separate wireless transceiver, or a separate remote control unit or a light switch. Embodiments consistent with the present disclosure support wireless lighting control and provide efficient indoor lighting. | 09-18-2014 |
20140286507 | Multi-Channel Pairing in a Media System - Technology for grouping, consolidating, and pairing individual playback devices with network capability (players) to stimulate a multi-channel listening environment is disclosed. Particularly, the embodiments described herein enable two or more playback devices to be paired, such that multi-channel audio is achieved. Such embodiments may be used to produce stereo and multi-channel audio environments for television and movies. | 09-25-2014 |
20140294204 | AUDIO AMPLIFIER MODE TRANSITION - An audio amplifier is to transition between a power-down mode and an active mode, based on assertion and deassertion of a power down signal. A power down control module is to selectively assert and deassert the power down signal to the audio amplifier. The power down control module may identify at least one of a digital detection signal and an analog detection signal. The digital detection signal indicates the availability of a digital audio signal to be amplified, and the analog detection signal indicates the availability of an analog audio signal to be amplified. | 10-02-2014 |
20140294205 | OUTPUT-STAGE CIRCUIT AND METHOD FOR OVER CURRENT PROTECTION THEREOF AND AUDIO AMPLIFY SYSTEM - An output-stage circuit is disclosed. The output-stage circuit includes high-side output driver, first body selector, low-side output driver, second body selector and inductance. When output current is larger than current threshold value so as to make the low-side output driver generate overcurrent, the low-side output driver controlled by second control signal is disabled, and the high-side output driver controlled by first control signal is enabled so as to create first current channel. When output current is larger than current threshold value so as to make the high-side output driver generate overcurrent, the high-side output driver controlled by the first control signal is disabled, and the low-side output driver controlled by the second control signal is enabled so as to create second current channel to avoid current flowing through low-side output driver's body, and thus reduce the output current and voltage spiking of the output voltage. | 10-02-2014 |
20140294206 | ASYMMETRICALLY-SWITCHED MODULATION SCHEME - An asymmetric modulation scheme may be used to drive two output nodes coupled to a load. The asymmetric modulation scheme may be one-sided such that the switching rate of a first output node is lower than the switching rate of a second output node. The first output node may be switched only to change a direction of current between the first output node and the second output node, while the second output node is switched to convey the information of an input signal. The asymmetric modulation scheme may be used to drive a speaker to reduce noise at the first output node to improve accuracy of current monitoring through the speaker by a current monitor coupled at the first output node. | 10-02-2014 |
20140294207 | AMPLIFIER OUTPUT COVER AND CONNECTOR - In at least one embodiment, an audio amplifier apparatus including a connector is provided. The apparatus includes a connector having a plurality of first openings. Each first opening being arranged to receive a first fastening mechanism to couple the connector to a first side of an audio amplifier. The connector further includes a plurality of second openings to enable access to a plurality of second fastening mechanisms which provide an electrical output from the audio amplifier. The connector further includes a plurality of terminal channels being angularly offset from the plurality of second openings. Each terminal channel being configured to receive a connection terminal to connect to a corresponding second fastening mechanism to electrically couple the connection terminal to the audio amplifier. | 10-02-2014 |
20140301576 | Adjustable audio splitter - An audio splitter receiving an incoming electrical signal defining an audio signal. The audio splitter receives an incoming signal and creates at least two identical channels having the same incoming signal. Each channel has a manually controlled amplifier. By manipulating the manually controlled amplifier, the operator is able to selectively magnifying the electrical signal within the channel. This allows the operator to adjust the intensity or “loudness” of the signal being generated as output within the channel. | 10-09-2014 |
20140301577 | CLASS-D POWER AMPLIFIER - The invention is provided with a first class-D amplifying unit for amplifying an inputted audio signal and supplying the amplified signal to a positive side of an audio output terminal, a second class-D amplifying unit for amplifying an inputted audio signal inverted in an inverting unit and supplying the amplified signal to a negative side of the audio output terminal, wherein, in a first mode, the first and second class-D amplifying units are activated and outputs of the first and second class-D amplifying units are kept equal to or less than a first current value, and wherein, in a second mode, the first class-D amplifying unit is activated, the second class-D amplifying unit is inactivated, the negative side of the audio output terminal is grounded, and output of the first class-D amplifying unit is kept equal to or less than a second current value larger than the first current value. | 10-09-2014 |
20140334647 | Dual Bridge Amplifier Configuration - An amplifier has a dual bridge design with two bridge amplifiers. A mode switch enables them to be configured in a series amplification mode. The switching of the mode switch is dynamic and enables re-use of signal current thereby improving overall system efficiency. A delay to the mode switch closure is provided in the event of clipping of one of the amplifier outputs. This prevents large cross currents from flowing. | 11-13-2014 |
20140341397 | Apparatus and Method for Controlling an Amplification Gain of an Amplifier, and a Digitizer Circuit and Microphone Assembly - A controller for controlling an amplification gain of an amplifier for amplifying a high dynamic range signal for an analog to digital converter comprises an input interface adapted to receive a representation of the high dynamic range signal and a signal compressor adapted to provide a low amplitude representation of the high dynamic range signal, the low amplitude representation having a lower signal amplitude than the high dynamic range signal. A comparator is adapted to compare the signal amplitude of the low amplitude representation with a predetermined threshold and an output interface is adapted to provide a control signal to the amplifier, the control signal being adapted to control the amplification gain of the amplifier such that the amplification gain is lowered when the signal amplitude of the low amplitude representation exceeds the predetermined threshold. | 11-20-2014 |
20140341398 | MULTICHANNEL DIGITAL AUDIO INTERFACE - A multichannel input device with automatic number-of-channels detection includes an automatic channel and bit depth detector, a digital audio interface (DAI), an analog device, and a digital-to-analog converter (DAC) coupling the DAI to the analog device. The automatic number-of-channels and bit depth detector has a BCLK input, a LRCLK input, a number of channels NCHAN output, and a bit depth B output. The DAI has a data DIN input, the BCLK input, the LRCLK input, an NCHAN input and a B input and has an output including data associated with an assigned channel. | 11-20-2014 |
20140355790 | AMPLIFIER AND METHOD OF AMPLIFYING A DIFFERENTIAL SIGNAL - An amplifier includes a differential input with a positive and a negative input and an analog integrator with a differential integrator input and a differential integrator output. The analog integrator further includes an operational amplifier with a positive operational amplifier input, a negative operational amplifier input, a positive operational amplifier output and a negative operational amplifier output. The differential integrator input is coupled to the differential input. A ternary pulse width modulator includes two modulator inputs coupled to the differential integrator output and two modulator outputs. A first feedback path is coupled between a first of the two modulator outputs and the positive operational amplifier input and a second feedback path is coupled between a second of the two modulator outputs and the negative operational amplifier input. A first divert capacitor is coupled between the positive operational amplifier input and a constant voltage reference. A second divert capacitor is coupled between the negative operational amplifier input and the constant voltage reference. | 12-04-2014 |
20140363028 | METHOD AND SYSTEM FOR CONTROLLING AMPLIFIERS - Techniques for controlling one or more audio amplifiers in or associated with a device coupled on a local area network are disclosed. An example playback device includes a processor, an amplifier, a network interface, and a memory. The memory includes a software module that, when executed by the processor, causes the playback device to: operate in a first power mode in which the amplifier consumes a first amount of power while operating in the first power mode, determine that a defined time has passed since receiving, via the network interface, a specified type of data packet; and based on determining that the defined time has passed since receiving the specified type of data packet, transition from operating in the first power mode to operate in a second power mode in which the amplifier consumes a second amount of power, wherein the first amount of power is greater than the second amount of power. | 12-11-2014 |
20140363029 | PROGRAMMABLE AUDIO DEVICE - An apparatus allowing the recording and storage of data with a programmable timer alarm/alert. This data that can be either retrieved manually or automatically via audio playback or computer link. For certain embodiments, the audio device is configured for mounting on a consumable item. In a further embodiment the audio device may include and collect information regarding the consumer item on which it is mounted. In yet another embodiment the audio device contains a timing device and an alarm function coupled to an actuator that can be set at predetermined intervals. | 12-11-2014 |
20140376748 | AUDIO SIGNAL PROCESSING SYSTEM - While level of the inputted analog signal is adjusted according to a set analog gain value and then analog-digital converted and outputted, when an automatic compensation is on and a difference of the analog gain value and a target value is compensated by level adjustment in a digital amplifier, the analog gain value is displayed by a gain knob, and in response to an operation to turn on the automatic compensation, a present value of the analog gain value at that time is displayed as a target gain value by a mark near the analog gain value, and in response to an operation to turn off the automatic compensation, display of the target gain value is erased. | 12-25-2014 |
20150010171 | Circuit for Use with a Loudspeaker for Portable Equipments - The invention relates to a circuit ( | 01-08-2015 |
20150016634 | Circuits For Improved Audio Signal Reconstruction - An impedance matched resonant circuit uses inductors coupling an audio source and a speaker array in order to reduce feedback reflection induced by an audio signal traveling from the audio source to the array of speakers. An RC circuit could also be coupled to the positive and negative terminals of the speaker array to reduce the slope differential of the audio signal at certain frequencies. The circuit can be packaged together in a single module with switches to activate and deactivate portions of the circuit to alter the effectiveness of the circuit depending upon need. | 01-15-2015 |
20150030183 | BOOST CONVERTER VOLTAGE CONTROLLED BASED ON AUDIO SIGNAL - Audio amplification may be improved by controlling an audio amplifier based on the audio signal being amplified. For example, when the audio signal level increases or decreases, a boost voltage provided to an audio amplifier by a boost converter may also be increased or decreased. In another example, when the audio signal level decrease below a certain level, the audio amplifier may be switched from amplifying the audio signal with a boost converter input to amplifying the audio signal with a low voltage input. Control of the audio amplifier may be implemented in a digital boost converter controller coupled to the boost converter and/or the audio amplifier. | 01-29-2015 |
20150030184 | Audio Amplifier and Power Supply Voltage Switching Method - An audio amplifier is provided with: an amplifier circuit; a power supply circuit that generates a plurality of power supply voltages; a power supply relay that selects one of the power supply voltages as the power supply voltage supplied to the amplifier circuit; a switching condition determiner that determines whether the switching condition of the power supply relay is satisfied; a silent section detector that detects a silent section of the audio signal which is equal to or greater than the operation time of the power supply relay; and a switching instruction unit for providing the power supply relay with an instruction for switching the power supply voltage during the silent section when the switching condition is satisfied and the silent section is detected. | 01-29-2015 |
20150055805 | MULTIPLE LEVEL CHARGE PUMP GENERATING VOLTAGES WITH DISTINCT LEVELS AND ASSOCIATED METHODS - A multi level charge pump circuit may be associated with at least two power supplies, and may provide at least four levels of positive and negative voltage. The multi level charge pump may include first and second fly capacitors, and first and second tank capacitors. A plurality of PMOS transistors and NMOS transistors may allow generation of two high voltage levels and two low voltage levels for the multi level charge pump, the low voltage levels being derived from a charging of the two fly capacitors in series. This multi level charge pump may be embodied in an audio device within a platform without a dedicated SMPS circuit. | 02-26-2015 |
20150086044 | AUDIO DEMONSTRATION KIT - An audio demonstration kit encourages understanding of audio concepts by enabling children to construct and study speaker performance. In a particular embodiment, the audio demonstration kit includes a paper speaker and instructions. The paper speaker includes a backplate, a suspension, and a diaphragm cut from a single sheet of paper. The demonstration kit may feature an amplifier that is configurable to accommodate various hardware additions as a child is ready for more progressively challenging construction. For example, the amplifier of an embodiment allows single and dual mode operation, as well as drives a rotary motor and is coordinated with a strobe light. The amplifier of an embodiment is synchronized with the strobe light and a moveable platform to create the impression of that jiggling figures attached to the table are dancing. Interfaces with smart phone, recording, and other technologies further enhances and encourages the learning experience. | 03-26-2015 |
20150098590 | MODULAR AUDIO SYSTEM AND METHOD - A method, computer program product, and computer system for receiving an indication that a first module is operatively connected to a main module, wherein the first module and the main module include hardware modules. A type of speaker operatively connected to the first module is identified. The type of speaker is matched to a speaker profile, wherein the speaker profile includes a predefined sound curve setting. The first module is tuned to the predefined sound curve setting based upon, at least in part, matching the type of speaker to the speaker profile. | 04-09-2015 |
20150104044 | Throat-Vibration-Type Microphone and Communication Hands-Free Device Containing Same - A throat-vibration-type sensor includes a ceramic sheet and a copper sheet received in a box body, wherein the ceramic sheet and the copper sheet are electrically connected to an amplification circuit for voice communications. The volume and thickness of the throat-vibration-type sensor is reduced, the cost thereof is reduced, the assembly thereof is easy, and the reception effect is increased. The throat-vibration-type sensor is combined with a communication hand-free device which includes a control circuit board, a sound amplification device and a battery unit. The throat-vibration-type sensor is used for relieving the interference of external noise. The communication hand-free device combined with the throat-vibration-type sensor avoids the inability of identifying a voice signal because of a wind shear sound caused by a high moving speed of a wearer, to improve the overall utilization efficiency of the communication hand-free device. | 04-16-2015 |
20150104045 | ULTRASONIC EMITTER SYSTEM WITH AN INTEGRATED EMITTER AND AMPLIFIER - An ultrasonic emitter is provided, where at least one of an amplifier, driver circuit, and signal processing circuitry is integrated onto or into the ultrasonic emitter. The ultrasonic emitter may include a backing plate and an amplifier and/or associated processing integrated directly onto the backing plate for amplifying and matching an audio modulated ultrasonic carrier signal to the ultrasonic emitter. The emitter is configured to launch a pressure-wave representation of the audio modulated ultrasonic carrier signal into the air. | 04-16-2015 |
20150110299 | Method and Device for Driving Digital Speaker Based on Code Conversion - A method and device for driving a digital speaker based on code conversion are provided in the invention. The method comprises the steps of: (1) converting input format; (2) performing multi-bit Σ-Δ modulation; (3) thermometer code conversion; (4) dynamic mismatch-shaping processing; (5) pulse width modulation code conversion; and (6) controlling on/off status switching of the MOSFET of a full-bridge power amplification network to drive a digital speaker load sound. The device comprises a sound source, an input format converter, a multi-bit Σ-Δ modulator, a thermometer coder, a dynamic mismatch shaper, a code converter, a multi-channel digital amplifier and a digital speaker load which are connected to each other in sequence. By means of the device and method of the invention, the switching rate of the power tube, the power dissipation and heating generated during the switching are reduced, the sound quality and efficiency of electroacoustic restoration are improved, the volume, weight and implementation cost of the system are decreased, and the level of electromagnetic radiation is reduced. Furthermore, the device and method of the invention also have excellent immunity to the frequency response deviation of multiple digital channels. | 04-23-2015 |
20150303884 | Driving Apparatus - A driving apparatus includes a power amplifier that supplies a driving signal to a vibrator, a current detector that outputs a detection signal corresponding to a driving current of the vibrator, and a driving controller that positively feedback a signal based on the detection signal to the power amplifier. The driving controller includes an A/D converter that A/D converts the detection signal, a first processing section that applies a gain compensation and compressor processes to an output digital signal of the A/D converter, a second processing section that performs a process of adding a digital signal corresponding to an input signal of the driving apparatus to an output digital signal of the first processing section, and a D/A converter that D/A converts an output digital signal of the second processing section to produce an analog signal supplied to the power amplifier. | 10-22-2015 |
20150318829 | LOW NOISE AMPLIFIER FOR MEMS CAPACITIVE TRANSDUCERS - This application relates to amplifier circuitry for amplifying a signal from a MEMS transducer. A super source follower circuit ( | 11-05-2015 |
20150318844 | SCHMITT TRIGGER WITH THRESHOLD VOLTAGE CLOSE TO RAIL VOLTAGE - Voltage level shifting in a switching output stage is presented. The circuit may include a switching output stage configured to receive an analog input signal and provide a responsive digital output signal, the switching output stage having a first switching device coupled to a first supply voltage and a second switching device coupled to a second supply voltage, the first switching device and the second switching device being coupled to a common output node. The apparatus may also include a voltage level shifter circuit coupled to a switching control node of the second switching device, the voltage level shifter configured to shift a voltage level at the switching control node of the second switching device relative to the analog input signal, wherein the digital output signal at the common output node transitions as the input signal reaches a predetermined threshold value. | 11-05-2015 |
20150326187 | Switched Mode Amplifier with Single-Ended Buck Mode - A power converter may include a power inductor, a plurality of switches arranged to sequentially operate in a plurality of switch configurations, an output for producing the output voltage, wherein a first switch is coupled to a first output terminal of the output and a second switch is coupled to a second output terminal of the output, and a linear amplifier coupled to the output. The controller may be configured to, in a linear amplifier mode of the power stage, enable the linear amplifier to transfer electrical energy from an input source of the power stage to the load, and in at least one mode of the power stage other than the linear amplifier mode, sequentially apply switch configurations from the plurality of switch configurations to selectively activate or deactivate each of the plurality of switches in order to transfer the electrical energy from the input source to the load. | 11-12-2015 |
20150326192 | AUDIO AMPLIFIER, AUDIO OUTPUT CIRCUIT, INTEGRATED CIRCUIT FOR AUDIO, ELECTRONIC DEVICE, AND METHOD FOR AMPLIFYING AUDIO SIGNAL - An audio amplifier is disclosed. The audio amplifier for driving an electroacoustic transducer includes an H bridge circuit including a 1D-class amplifier connected to a (+) electrode terminal and a 2D-class amplifier connected to a (−) electrode terminal of the electroacoustic transducer; a pulse width modulator configured to receive an audio signal, generate a first and second pulse signal for each driving the 1D-class and the 2D-class amplifier, and adjust a phase difference between the first and the second pulse signal; a first driver driving the 1D-class amplifier depending on the first pulse signal; a second driver driving the 2D-class amplifier depending on the second pulse signal; a level detector detecting a level of the audio signal; a phase adjuster configured to set a phase difference between the first pulse signal and the second pulse signal of the pulse width modulator based on a detection result from the level detector. | 11-12-2015 |
20150349714 | AUDIO AMPLIFIER - A amplifier with improved space efficiency includes a housing that dissipates heat having an upper wall and two side walls and having an interior with upper and lower portions. The amplifier further includes an upper circuit board in the upper portion and a lower circuit board in a lower portion. The amplifier further includes a connector that electrically connects the upper and lower circuit boards. | 12-03-2015 |
20150365059 | CLASS-D AMPLIFIER AND ELECTRONIC APPARATUS - Disclosed is a class-D amplifier including a first output circuit, a first capacitor, a pulse width modulator, and a slew rate limiting amplifier. The first output circuit includes first and second switching devices that are connected in series between first and second power supply lines. The first capacitor is connected between the first and second power supply lines. The pulse width modulator generates a pulse width modulated switching signal based on a triangular wave and an audio signal, and provides the switching signal to the first output circuit. The slew rate limiting amplifier is connected to an input part of the pulse width modulator to which the audio signal is provided, and limits a slew rate of output. The sound-producing device is connected in series to an inductor connected to a first output node of the first output circuit. The sound-producing device and the inductor constitute an LC filter. | 12-17-2015 |
20160021445 | MODULAR AUDIO SYSTEM - A modular audio system is described. The modular audio system may include a support unit having a base portion, a plurality of connector supports, each of the plurality of connector supports being coupled to the base portion, and a plurality of connectors, each of the plurality of connectors being coupled to a respective connector support, the plurality of connectors being adapted to physically join an external device to the support unit. The modular audio system may also include a modular speaker unit having a digital signal processing unit that is disposed within the modular speaker unit and adapted to receive an input signal and a control signal, and an amplifier that is disposed within the modular speaker unit and adapted to drive a speaker diaphragm. | 01-21-2016 |
20160029116 | HIGH OUTPUT LOUDSPEAKER - A loudspeaker system is provided that includes a speaker enclosure having a first opening and a second opening; a first speaker manifold mounted within the enclosure and including a first back wall, four first side walls, and an open first front side substantially in alignment with the first opening; a second speaker manifold mounted within the enclosure and including a second back wall, four second side walls, and an open second front side substantially in alignment with the second opening; a woofer mounted on a first wall of the first side walls; and an acoustic vent mounted in a second wall among the second side walls. | 01-28-2016 |
20160043696 | CLASS D SWITCHING AMPLIFIER AND METHOD OF CONTROLLING A LOUDSPEAKER - A switching amplifier includes a first half-bridge PWM modulator, a second half-bridge PWM modulator, and at least one amplifier stage configured to receive input signals. The switching amplifier also includes a PWM control stage configured to control switching of the first PWM modulator and of the second PWM modulator as a function of the input signals, by respective first PWM control signals and second PWM control signals. The amplifier stage and the PWM control stage have a fully differential structure. | 02-11-2016 |
20160050492 | DIRECT-DRIVE DIGITAL AUDIO AMPLIFIER FOR ELECTROSTATIC LOUDSPEAKERS - A direct-drive digital audio amplifier for electrostatic loudspeakers (ESL) includes a pulse-width-modulation (PWM) generator that generates a PWM signal from a digital audio signal received from an audio source. The generated PWM signal is amplified to a high voltage, such as several hundred volts, by a high-voltage switching circuit. The amplified PWM signal is then applied to the stator panels of the electrostatic loudspeaker (ESL), whereupon the amplified PWM signal is low-pass filtered by the electrostatic loudspeaker to generate audible sound waves, which are then high-pass filtered by a listener's ears, so as to audibly reproduce the digital audio signal. | 02-18-2016 |
20160050497 | VOICE COIL MOTOR AND LOUDSPEAKER CONTROLLER - A voice coil motor controller configured to determine a voltage across and a current through a voice coil motor having an input signal supplied thereto and determine its impedance therefrom, the controller further configured to identify asymmetry in variations of said impedance over time to determine an asymmetry value, the controller further configured to provide for control of said voice coil motor using said asymmetry value. | 02-18-2016 |
20160072465 | SYSTEMS AND METHODS FOR GAIN CALIBRATION OF AN AUDIO SIGNAL PATH - A signal path may operate in one of a plurality of gain modes such that for each gain mode, the product of a digital gain and an analog signal gain of the signal path associated with the particular gain mode are approximately equal to a fixed path gain. During each of one or more calibration phases, a calibration system may measure analog signals at a plurality of nodes of the first path portion, calculate an actual analog gain associated with the gain mode based on the analog signals measured at the plurality of nodes, calculate an error between the fixed path gain and a mathematical product of the actual analog gain associated with the gain mode and the digital gain associated with the gain mode, and modify at least one of the digital gain and the analog gain associated with the gain mode in conformity with the error. | 03-10-2016 |
20160094918 | ACOUSTIC TRANSDUCER AND MICROPHONE - An acoustic transducer includes a slit having higher passage resistance than in conventional structures and having a lower rate of decrease in the passage resistance than in conventional structures when, for example, the vibration electrode plate warps. The acoustic transducer includes a stationary electrode plate, and a vibration electrode plate facing the stationary electrode plate with a space between the electrode plates. The vibration electrode plate includes a slit that allows sound to pass through. The vibration electrode plate includes a resistance increasing section including at least one pair of high-resistance surfaces that constitute side surfaces of the slit in a width direction thereof, and are thicker than a middle portion of the vibration electrode plate. | 03-31-2016 |
20160118892 | Reconfigurable Output Stage - A circuit comprising: —an output stage according to the invention; —a first control apparatus comprising a control stage of the first control apparatus is connected to the output stage; and, —a second control apparatus comprising a control stage of the second control apparatus is connected to the output stage; wherein, —when the control stage of the first control apparatus is connected to the output stage, the control stage of the second control apparatus is electrically disconnected from the output stage, the output stage being configured to operate in a first operating state; and, —when the control stage of the second control apparatus is connected to the output stage, the control stage of the first control apparatus is electrically disconnected from the output stage, the output stage being configured to operate in a second operating state. The output stage and the use of the output stage are also claimed. | 04-28-2016 |
20160119699 | UMBRELLA MOUNTED SOUND SYSTEM - A sound system for mounting to an umbrella includes a housing and at least one speaker. The system further includes an amplifier, at least one input device, and a power source. The system further includes an upper coupler that engages a male coupling element on an upper shaft of the umbrella. The system further includes a lower coupler that engages a female coupling element on a lower shaft of the umbrella. | 04-28-2016 |
20160126910 | Power Increase Based on Packet Type - Techniques for controlling one or more audio amplifiers in or associated with a device coupled on a local area network are disclosed. The device receives at least one selected source from other devices also coupled on the network According to one aspect of the techniques, an automatic shutdown control module is provided in the device to power down the audio amplifiers when there is no audio data flow coming to the device or power up the audio amplifiers when there is audio data flow coming to the device. In one embodiment, the procedure to power down or power up the amplifiers is in accordance with a hysteresis, wherein the hysteresis, being lagging of an effect behind its cause, protects the amplifiers and makes the powering-down or powering-up procedure unnoticeable to a user. | 05-05-2016 |
20160134239 | CLASS D POWER DRIVER PERIPHERAL - A Class D peripheral is integrated with a microcontroller as a general purpose driver for providing many different Class D power applications such as motor and solenoid control, audio amplification, etc. Use of a simple triangle waveform (saw tooth) oscillator normally used for detecting changes in capacitance values in combination with a voltage comparator provides inexpensive generation of pulse width modulation (PWM) suitable for a wide range of Class D power applications. Selection of either an external audio input or an internal processor controlled analog reference provides for flexible adaptability to any Class D power driver requirement. | 05-12-2016 |
20160182999 | AUDIO SPEAKER PROTECTION SYSTEM AND METHOD | 06-23-2016 |
20160197588 | AUDIO DELIVERY SYSTEM HAVING AN IMPROVED EFFICIENCY AND EXTENDED OPERATION TIME BETWEEN RECHARGES OR BATTERY REPLACEMENTS | 07-07-2016 |