| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 381097000 | INCLUDING PHASE CONTROL | 50 |
| 20080212796 | Auditory sense training method and sound processing method for auditory sense training - An auditory sense training device | 09-04-2008 |
| 20080292112 | Method for Recording and Reproducing a Sound Source with Time-Variable Directional Characteristics - The invention relates to a method for recording sound signals of one or more sound sources located in a recording space and having time-variable directional characteristics and for reproducing the sound signals and directional information of the sound sources true to life in an area of reproduction. The invention also relates to a system for carrying out the method. In order to be able to record, transmit and reproduce the directional information of a sound source in real time, only the main direction of emission of the sound signal emitted by the sound source is detected in the recording space in a time-dependent manner and reproduction is carried out depending on the detected main direction of emission. In order to convey the directional information, the sound signals are reproduced by means of a first reproduction unit associated with the sound source and at least one second reproduction unit spaced apart from the first reproduction unit. Reproduction by means of the one or more second reproduction units proceeds with a time delay τ in relation to the first reproduction unit. | 11-27-2008 |
| 20090010455 | SPEAKER ARRAY APPARATUS - A speaker array apparatus includes a speaker array that emits sounds of a plurality of channels, a beam formation calculating section that performs a calculation for controlling phases of the sounds so that the speaker array emits sound beams in directions set for the respective channels, a sound source localization applying section that performs a calculation for controlling the phases of the sounds emitted from the speaker array so as to form a plurality of virtual point sound sources, and performs a calculation of auditory sensation characteristics at a listening position on a basis of a head-related transfer function, a selecting section that selects one of the beam formation calculating section and the sound source localization applying section, and a phase controlling section that controls the phases of the sounds emitted from the speaker array on a basis of a calculation result of the beam formation calculation section which is selected by the selecting section or applies the auditory sensation characteristics and controls the phase of a wavefront from the virtual point sound source on a basis of a calculation result of the beam formation calculating section which is selected by the selecting section. | 01-08-2009 |
| 20090028358 | SPEAKER ARRAY APPARATUS - A speaker array apparatus includes a speaker array in which a plurality of speaker units are arranged, a storage section that stores installation position information of the speaker array, a position detecting section that detects a listening position of a listener, and a phase controlling section that controls phases of sounds to be emitted from the speaker units so that the speaker array emits sound beams of a plurality of channels. The phase controlling section controls the phases of the sounds on the basis of the installation position information and the listening position of the listener so that the speaker array emits the sound beams of the plurality of channels to form a surround sound field at the listening position of the listener. | 01-29-2009 |
| 20090060224 | SOUND PROCESSING APPARATUS, METHOD FOR CORRECTING PHASE DIFFERENCE, AND COMPUTER READABLE STORAGE MEDIUM - There is provided a sound processing apparatus for processing received sounds. A plurality of sound receiving units which are included in the apparatus output individually a sound signal corresponding to a received sound, then the sound signals in a time domain are converted into respective converted signal in a frequency domain, and a spectral ratio between the two converted signals is calculated for driving a phase correction value which corrects a phase of the sound signal. | 03-05-2009 |
| 20100040243 | Sound Field Widening and Phase Decorrelation System and Method - A system for decorrelating signals including a first all pass filter, having a first delay length, processing a first signal. A second all pass filter, having a second delay length, is connected to the first all pass filter and processes the first signal after processing by the first all pass filter. A third all pass filter, having a third delay length, processes a second signal. A fourth all pass filter, having a fourth delay length, is connected to the third all pass filter and processes the second signal after processing by the third all pass filter. The first delay length, the second delay length, the third delay length and the fourth delay length each have a unique value, and the sum of the first delay length and the second delay length is equal to the sum of the third delay length and the fourth delay length. | 02-18-2010 |
| 20100119080 | HUMAN BODY SOUND TRANSMISSION SYSTEM AND METHOD USING SINGLE SOUND SOURCE - Provided are a human body sound transmission system and a method using single sound source. The human body sound transmission system includes a first transmission block for transmitting a combined signal of a first high frequency signal and a sound signal through a human body; and a second transmission block for transmitting a second high frequency signal having the same frequency as the first high frequency signal through the human body, to thereby recover the sound signal by destructing interference in a ear region of a user. | 05-13-2010 |
| 20100124342 | FORCED ACOUSTIC DIPOLE AND FORCED ACOUSTIC MULTIPOLE ARRAY USING THE SAME - Provide is a forced acoustic dipole in which a direction of an acoustic lobe can be freely steered by controlling phase and sound pressure of input signals input into first and second sound sources, respectively. Accordingly, when a forced acoustic multipole array is configured by arranging a plurality of forced acoustic dipoles and a direction of an acoustic lobe is steered in a particular direction by controlling phase and sound pressure of input signals input into the first and second sound sources, respectively, it is possible for a sound to be heard in a desired location without auditory disturbance to others. | 05-20-2010 |
| 20100172515 | FILTER CIRCUIT - A filter circuit includes: an input terminal; a first resistance; a second resistance; a capacitor; and an output terminal, in which the first resistance, the second resistance, and the capacitor are connected in series in this order between the input terminal and a ground point, the output terminal is provided at a connection point of the first resistance and the second resistance, and a frequency domain is used that is higher than a maximum phase delay frequency higher than a cutoff frequency, the cutoff frequency being determined by a combined resistance value of the first and the second resistances and a capacitance value of the capacitor, so that when a frequency of an input signal becomes higher, a phase delay of an output signal relative to the input signal is reduced. | 07-08-2010 |
| 20100177911 | Method of constructing a multiway loudspeaker system with improved phase response to pass a square wave - A multi-way loudspeaker system comprising of frequency equalization circuit, a linear phase dividing network, with optional phase shifters to enable the loudspeaker to have substantially improved frequency and phase response characteristics but not limited thereto is discussed. The loudspeaker exhibits high accuracy not only in amplitude but also in time domain characteristics which results in an improved transmission characteristics of time sensitive signals such as square waves. | 07-15-2010 |
| 20100189282 | PHASE EQUALIZATION FOR MULTI-CHANNEL LOUDSPEAKER-ROOM RESPONSES - A system and method for minimizing the complex phase interaction between non-coincident subwoofer and satellite speakers for improved magnitude response control in a cross-over region. An all-pass filter is cascaded with bass-management filters in at least one filter channel, and preferably all-pass filters are cascaded in each satellite speaker channel. Pole angles and magnitudes for the all-pass filters are recursively calculated to minimize phase incoherence. A step of selecting an optimal cross-over frequency may be performed in conjunction with the all-pass filtering, and is preferably used to select an optimal cross-over frequency prior to determining all-pass filter coefficients. | 07-29-2010 |
| 20100220871 | SPEAKER DEVICE - A speaker device comprises a first speaker (SP | 09-02-2010 |
| 20110058684 | AUDIO REPRODUCTION DEVICE - An audio reproduction device reproduces a one-channel signal from two speakers arranged in a sound field. The one-channel input signal is delayed by a delay element. The delay element performs a delay with different delay amount for a plurality of frequency bands. The signal delayed by the delay element is outputted to one of the two speakers and the input signal is directly outputted to the other one of the two speakers. | 03-10-2011 |
| 20110064243 | Acoustic Processing Device - An acoustic processing device includes an input section to which audio signals of a plurality of channels respectively including in-phase components are input, a phase adjusting section that adjusts phases of the audio signals of the plurality of channels respectively to generate phase adjustment signals of the plurality of channels being different in phase from the audio signals of the plurality of channels input to the input section, an anti-phase generating section that generates an anti-phase signal by adding the phase adjustment signals of the plurality of channels to each other and adjusting a phase of the added signal to a substantially inverted phase, and an output section that outputs signals obtained by adding, to each of the audio signals of the plurality of channels input to the input section, the phase adjustment signal of another channel and the anti-phase signal. | 03-17-2011 |
| 20110293111 | Audio Processing Apparatus and Related Method - An audio processing apparatus including an audio phase detecting device and an adjusting device is provided. After detecting a phase relationship between a first channel signal and a second channel signal, the audio phase detecting device generates a phase control signal. The adjusting device is coupled to the audio phase detecting device and used for selectively adjusting the first channel signal according to the phase control signal. | 12-01-2011 |
| 20120008797 | SOUND PROCESSING DEVICE AND SOUND PROCESSING METHOD - A sound processing apparatus ( | 01-12-2012 |
| 20120033829 | Audio phase corrector - An audio phase corrector circuit which shifts the phase of substantially all frequencies of an audio signal by 90 degrees for the purpose of enhancing sound produced by an electroacoustic transducer. Embodiments are implemented by a digital finite impulse response filter configured to operate as a 90-degree phase shift circuit, commonly called a Hilbert transformer. The 90-degree phase shift corrects a characteristic phase distortion caused by electroacoustic transducers and thereby retains much of the impulse and transient information in the acoustic output that would otherwise be lost. The resulting sound has substantially improved clarity, detail, presence, placement, and spaciousness. | 02-09-2012 |
| 20120076323 | Device and Method for Manipulating an Audio Signal - A device and method for manipulating an audio signal includes a windower for generating a plurality of consecutive blocks of audio samples, the plurality of consecutive blocks including at least one padded block of audio samples, the padded block having padded values and audio signal values, a first converter for converting the padded block into a spectral representation having spectral values, a phase modifier for modifying phases of the spectral values to obtain a modified spectral representation and a second converter for converting the modified spectral representation into a modified time domain audio signal. | 03-29-2012 |
| 20120281858 | METHOD AND APPARATUS FOR TRANSMISSION OF SOUND WAVES WITH HIGH LOCALIZATION of SOUND PRODUCTION - A system for the production of localized audible sound, including a source of voltage oscillations in the ultrasonic frequency range, at a reference frequency. The voltage source is connected to a first ultrasonic transducer, emitting a first beam of ultrasonic waves (the reference beam) in a relatively narrow beam, in a desired direction. The same voltage source is connected to a phase shifter, feeding a second ultrasonic transducer from which an ultrasonic wave is emitted, of the same frequency and intensity as the reference beam, but phase shifted relative to it. | 11-08-2012 |
| 20120321102 | METHOD AND APPARATUS CREATING A PERSONAL SOUND ZONE - A personal sound zone creating apparatus includes a broadside array adapted to generate a sound beam orthogonal to an arrangement of an array constituted by at least three transducers in a personal audio device. Therefore, the personal sound zone creating apparatus controls rear radiation by including an end-fire array increased in directivity in a horizontal direction. | 12-20-2012 |
| 20130010983 | DEVICE AND METHOD FOR MANIPULATING AN AUDIO SIGNAL HAVING A TRANSIENT EVENT - A signal manipulator for manipulating an audio signal having a transient event may have a transient remover, a signal processor and a signal inserter for inserting a time portion in a processed audio signal at a signal location where the transient event was removed before processing by the transient remover, so that a manipulated audio signal has a transient event not influenced by the processing, whereby the vertical coherence of the transient event is maintained instead of any processing performed in the signal processor, which would destroy the vertical coherence of a transient. | 01-10-2013 |
| 20130016855 | CONTROL DEVICE FOR DRIVING MULTI-FUNCTION SPEAKER BY USING DIGITAL MIXING SCHEME AND RELATED CONTROL METHOD THEREOF - A control device and an associated method for driving a multi-function speaker supporting a plurality of predetermined functions including at least an audio function and a non-audio function includes a digital signal mixing block and a digital-to-analog block. The digital signal mixing block is arranged for receiving a plurality of digital input signals corresponding to the predetermined functions, respectively, and generating a digital mixed signal according to the digital input signals. The digital-to-analog block is coupled to the digital signal mixing block, for generating an analog driving signal to the multi-function speaker according to the digital mixed signal. | 01-17-2013 |
| 20130034244 | AUDIO SYSTEM, METHOD FOR GENERATING AN AUDIO SIGNAL, COMPUTER PROGRAM AND AUDIO SIGNAL - The invention relates to an audio system for generating an audio signal. More specifically the invention relates to an audio system, especially an audio alarm system, for generating an audio signal comprising means for generating a component of the audio signal at a base frequency and means for generating further components of the audio signal at other frequencies than the base frequency, whereby the base and the other frequencies are separated from each other by separating frequency bands in order to enhance the loudness of the audio signal. The invention furthermore relates to a method for generating an audio signal, a computer program and an audio signal. | 02-07-2013 |
| 20130034245 | SPEAKERPHONE USING ADAPTIVE PHASE ROTATION - An improved speakerphone for a cellular telephone, portable telephone handset, or the like. In one embodiment, a receiver provides an audio signal, and a first phase-shifter phase-shifts the audio signal by a first phase-shift amount. A second phase-shifter phase-shifts the audio signal by a second phase-shift amount and drives a loudspeaker. A detector generates average and peak values of the first phase-shifted audio signal. A processor sets the first phase-shift amount to each one of a plurality of phase-shift amounts and calculates a corresponding average-to-peak ratio value from the peak and average values. The processor then selects one of the plurality of phase-shift amounts having a corresponding average-to-peak ratio value that meets at least one criteria (e.g., the largest one of the average-to-peak ratio values), and then sets the second phase-shift amount to be the same as the selected phase-shift amount. This enhances the perceived loudness of sound from loudspeaker. | 02-07-2013 |
| 20130039512 | Speaker Device And Filter Coefficient Generating Device Therefor - To provide a speaker device that can form a substantially uniform sound field over a range from a long distance to a short distance without significantly increasing a calculation load. A plurality of FIR filters | 02-14-2013 |
| 20130058498 | DEVICE AND METHOD FOR IMPROVED MAGNITUDE RESPONSE AND TEMPORAL ALIGNMENT IN A PHASE VOCODER BASED BANDWIDTH EXTENSION METHOD FOR AUDIO SIGNALS - An apparatus for generating a bandwidth extended audio signal from an input signal, includes a patch generator for generating one or more patch signals from the input signal, wherein the patch generator is configured for performing a time stretching of subband signals from an analysis filterbank, and wherein the patch generator further includes a phase adjuster for adjusting phases of the subband signals using a filterbank-channel dependent phase correction. | 03-07-2013 |
| 20130089219 | NOISE REDUCTION IN AN ELECTRONIC DEVICE - A method includes: detecting movement of a component of the electronic device; receiving an audio signal using a microphone of the electronic device, the audio signal including a noise signal corresponding to the component movement; and in response to detecting the component movement, combining the audio signal with a phase-inverted noise signal generated by phase inverting a recorded noise signal of the event received using the microphone of the electronic device. | 04-11-2013 |
| 20130089220 | SOUND REPRODUCING APPARTUS - A sound reproducing apparatus is provided to include a controller configured to receive first and second sound source signals, to control magnitudes and phases of the received first and second sound source signals to be heard as if sound is reproduced at a pre-determined position within a listening space, and to output first and second control sound source signals; a first speaker configured to receive the first control sound source signal and to reproduce sound; and a second speaker configured to receive the second control sound source signal and to reproduce sound, wherein the pre-determined position is distant from a listener. | 04-11-2013 |
| 20130089221 | SOUND REPRODUCING APPARATUS - A sound reproducing apparatus is provided to include a control device configured to receive first and second sound source signals, controls magnitudes and phases of the received first and second sound source signals to be heard as if sound is reproduced at a pre-determined position within a listening space, and to output first and second controlled sound source signals; a first speaker configured to receive the first controlled sound source signal and to reproduce sound; a second speaker configured to receive the second controlled sound source signal and to reproduce sound; and an input device with which a user can draw the listening space and mark the pre-determined position and the user's position in the drawn listening space, wherein the pre-determined position is distant from the user, wherein the input device is made of a touch panel and the user can draw the listening space with his/her finger or a pen and mark the pre-determined position and the user's position through the touch panel, and wherein the control device controls the magnitudes and phases of the first and second sound source signals to be heard as if sound is reproduced at an actual pre-determined position within the listening space corresponding to the pre-determined position marked on the input device, and outputs the first and second controlled sound source signals. | 04-11-2013 |
| 20130148822 | Correcting Non-Linear Loudspeaker Response - The invention relates to processing an audio signal to correct the non-linear frequency response of a loudspeaker. An input audio stream ( | 06-13-2013 |
| 20130156224 | SYSTEMS AND METHODS FOR MATCHING GAIN LEVELS OF TRANSDUCERS | 06-20-2013 |
| 20130177169 | SPEAKER SYSTEM - Speaker systems having simple structure, high output power, and desired directivity are disclosed. In one embodiment, a speaker system includes a first sound emission surface that emits a first sound in a first direction and a second sound emission surface that emits a second sound in a second direction that intersects with the first direction at a predetermined angle. The first and second sounds include at least sounds respectively generated from a common first signal source and different in phase from each other. | 07-11-2013 |
| 20130195286 | Equalization of an Audio Signal - A method of processing an input audio signal, the method comprising forming a plurality of output audio signals from the input audio signal, wherein each output audio signal is formed by performing respective processing on the input audio signal, wherein for a first output audio signal there is a target audio equalization operation comprising a target filter twice, wherein for the first output 10 audio signal, the respective processing comprises a first audio equalization operation, the first audio equalization operation being the target audio equalization operation modified to compensate for phase shifts that correspond to zeros of the transfer function of the target audio equalization operation, wherein for each output audio signal other than the first output audio signal, the respective 15 processing comprises a compensation filter that compensates for phase shifts that correspond to poles of the transfer function of the target audio equalization operation. 20 | 08-01-2013 |
| 20130243220 | SOUND GENERATION DEVICE, SOUND GENERATION METHOD AND STORAGE MEDIUM STORING SOUND GENERATION PROGRAM - Disclosed is a sound generation device including a receiver which receives a sound emission instructing signal in which time data is included and a difference calculator which calculates a difference between a timing indicated in the received time data and a timing when the sound emission instructing signal is received by the receiver, when the sound emission instructing signal in which the time data is included is received. The sound generation device further includes a histogram creator which creates a histogram on the basis of the calculated difference and a difference calculated previously, when the difference is calculated and a timing controller which controls a timing for supplying the received sound emission instructing signal to a sound emission unit on the basis of the calculated difference and a most frequent difference in the created histogram, when the difference is calculated. | 09-19-2013 |
| 20130329910 | Systems and Methods for Reducing Stray Magnetic Flux - Systems and methods for reducing the effects of stray magnetic flux are provided. For example, an electronic device can employ the system and can include a first audio component configured to have a first acoustic phase and a first magnetic phase. The electronic device can also include a second audio component configured to have the first acoustic phase and a second magnetic phase that is opposite the first magnetic phase. The first audio component can be positioned with respect to the second audio component, such that any stray magnetic flux from the first audio component enters the second audio component during operation of the first and second audio components. | 12-12-2013 |
| 20140023206 | ACOUSTIC APPARATUS - According to one embodiment, an amplitude modulation unit generates a first signal by modulating an amplitude of a carrier wave signal having a frequency of an ultrasonic band, based on an acoustic signal. A phase control unit generates a second signal and a third signal by controlling a phase of the first signal. Respective phases of the second signal and the third signal are approximately opposite. A first parametric loudspeaker radiates a first sound wave toward a first control point, based on the second signal. A first reflection unit has a first concave to receive a sound wave and reflect the sound wave toward the first control point. A focal point of the sound wave reflected by the first concave is the first control point. A second parametric loudspeaker radiates a second sound wave toward the first concave, based on the third signal. | 01-23-2014 |
| 20140050334 | TRANSFORMING AUDIO CONTENT FOR SUBJECTIVE FIDELITY - A method or apparatus for delivering audio programming such as music to listeners may include identifying, capturing and applying a listener's audio perception characteristics (sometimes referred to as the listener's Personal Waveform Profile) to transform audio content so that the listener perceives the content similarly to how the content would be perceived by a different listener. An audio testing tool may be implemented as software application to identify and capture respective listeners' Personal Waveform Profiles. A signal processor may operate an algorithm processing source audio content using the respective listeners' Personal Waveform Profiles to provide audio output based on a difference between different profiles. | 02-20-2014 |
| 20140133675 | Time Interval Sound Alignment - Time interval sound alignment techniques are described. In one or more implementations, one or more inputs are received via interaction with a user interface that indicate that a first time interval in a first representation of sound data generated from a first sound signal corresponds to a second time interval in a second representation of sound data generated from a second sound signal. A stretch value is calculated based on an amount of time represented in the first and second time intervals, respectively. Aligned sound data is generated from the sound data for the first and second time intervals based on the calculated stretch value. | 05-15-2014 |
| 20140161279 | CREATION OF SUB-SAMPLE DELAYS IN DIGITAL AUDIO - A multi-channel audio system that can provide a variable sub-sample delay between two or more audio channels. In one embodiment, a variable timing clock generator generates multiple clock signals where each may have different phase, and the clock generator can vary the phase difference, in accordance with a sub-sample delay setting input. These clock signals are used by respective digital-to-analog converters (DACs) to convert the digital audio channels into analog form. In another embodiment, a variable delay block is added to an oversampling DAC, on a per channel basis. Other embodiments are also described and claimed. | 06-12-2014 |
| 20140177869 | ADAPTIVE PHASE DISCOVERY - In an adaptive phase discovery system a first audio signal is received via a first microphone and a second signal is received via a second microphone. Corresponding audio frames of the first and second signals are each transformed into the frequency domain and a plurality of frequency sub-bands are generated. A phase is determined for each frequency sub-band in each signal. Instantaneous phase differences are determined between the signals at each of the frequency sub-bands. Lower frequency instantaneous phase differences are filtered over time to determine current phase differences at lower frequencies. When SNR is high in lower frequency sub-bands, lower frequency sub-band phase differences are tracked to the higher frequency sub-bands. The tracked higher frequency phase differences are filtered over time to determine phase differences for the current frame. The phase differences may be used to rotate phases in each sub-band and sum signals and/or to reject off-axis signals. | 06-26-2014 |
| 20150043746 | SOUND REPRODUCTION DEVICE - The sound reproduction device is applied to an acoustic space such as a passenger compartment, and controls the levels of the reproduced sounds at two evaluation points set at the seats in the passenger compartment, for example. Specifically, the sound reproduction device controls the phase of the one channel sound signal inputted from external and supplies it to the pair of speakers. The phase control is performed such that the sum of reproduced sound levels at the two evaluation points becomes larger than the sum of the reproduced sound levels at the two evaluation points in a case where the sound signal is reproduced by only one of the pair of speakers, in an entire audible band | 02-12-2015 |
| 20150326962 | CONDENSER MICROPHONE - Provided is a condenser microphone having a plurality of condenser microphone units connected in series to improve output sensitivity, and a simplified circuit configuration. At least one of the preceding condenser microphone units, excepting a last condenser microphone unit, and an adjacent succeeding condenser microphone unit are directly connected to transmit an audio signal obtained from the at least one of the preceding condenser microphone units to the adjacent succeeding condenser microphone unit. An impedance converter using an active element is connected to the last condenser microphone unit, and the audio signals obtained from the condenser microphone units are added and output from the impedance converter using the active element. | 11-12-2015 |
| 20150365764 | METHOD AND ELECTRONIC DEVICE - According to one embodiment, a method includes giving a phase difference between a first phase of a first sound output from a first diaphragm and a second phase of a second sound output from a second diaphragm. The first diaphragm and the second diaphragm are arranged adjacent to each other in a first direction toward a head portion of a listener. The first diaphragm and the second diaphragm extend in a second direction substantially intersecting with the first direction. | 12-17-2015 |
| 20150373452 | Loudspeaker System - Provided is a loudspeaker system capable of easily determining control parameters for controlling the directional characteristics of a speaker set including two or more speaker units. The loudspeaker system is configured to include: a speaker set | 12-24-2015 |
| 20160050490 | ADAPTIVE PHASE CONTROL OF CRYOCOOLER ACTIVE VIBRATION CANCELLATION - A method includes identifying a magnitude and phase angle of vibration forces resulting from a previous cancellation signal, where a first measured force vector is defined by this magnitude and phase angle. The method also includes identifying a magnitude and phase angle of a first cancellation force and transmitting a first AFF cancellation signal configured to generate the first cancellation force, where a first cancellation force vector is defined by this magnitude and phase angle. The method further includes identifying a magnitude and phase angle of vibration forces resulting from the first AFF cancellation signal, where a first resultant force vector is defined by this magnitude and phase angle. Moreover, the method includes determining whether a phase angle difference between the phase angles of the first resultant force vector and the first measured force vector is substantially equal to zero. If so, the method includes continuing to transmit the first AFF cancellation signal. | 02-18-2016 |
| 20160173979 | SYSTEM AND METHOD FOR DECORRELATING AUDIO DATA | 06-16-2016 |
| 20160196831 | SYSTEM ASPECTS OF AN AUDIO CODEC | 07-07-2016 |
| 20160196838 | Utilizing Digital Microphones for Low Power Keyword Detection and Noise Suppression | 07-07-2016 |
| 20160381464 | TWO PORT SPEAKER ACOUSTIC MODULATOR - A two-port air pump speaker that includes at least two active, phase-modulated, bi-directional shutters and an ultrasonic pumping chamber having at least two ports; a first port facing towards the listener, the forward port, and a second port facing another direction, the backward port which may be behind an acoustic baffle or inside a speaker enclosure. A two-port speaker with two active steering shutters can create continuous bi-directional airflow which leads to low distortion reproduction of low audio frequencies. The same improved design can be used also for other applications where acoustic modulation is required, especially in ultrasonic frequencies. | 12-29-2016 |
| 20180025741 | Systems and Methods for Audio Based Synchronization Using Energy Vectors | 01-25-2018 |
