| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 381003000 | FM final modulation | 27 |
| 20080260165 | DIGITAL MODULATOR AND DIGITAL MODULATING METHOD - A digital modulator performs BPSK on differential data, filters it, and outputs the resultant data. A determining unit determines a combination of continuous two values of differential data. In a waveform generator, waveform generation rules are set for each of the combinations. On the basis of the waveform generation rule corresponding to the combination determined by the data determining unit, the waveform generator sequentially outputs a digital waveform signal. | 10-23-2008 |
| 20080285761 | FILTER CIRCUIT - A pre-emphasis filter emphasizes a high-frequency component of an input audio signal. A limiter circuit detects that the output signal from the pre-emphasis filter reaches a predetermined upper limit level. A filter adjusting circuit changes the frequency characteristic of the pre-emphasis filter when a limit operation is generated in the limiter circuit. | 11-20-2008 |
| 20090028346 | FM stereo transmitter and a digitized frequency modulation stereo multiplexing circuit thereof - A digitized FM (frequency modulation) stereo multiplexing circuit for an FM stereo transmitter has a digital audio I/O interface, a digitized FM stereo multiplexing circuit, a low-pass filter and an FM circuit. When a digital audio data is inputted, a digital audio decoder decodes the digital audio data to acquire left and right channel audio signals. The left and right channel audio signals are inputted to an over-sampling unit circuits to process sampling and then to output to an FM stereo multiplexer. The FM stereo multiplexer then generates a master signal and a secondary signal by processing the sampled left and right channel audio signals. In the meanwhile a switch signal and a pilot signal are acquired with an address counter to output from a memory unit. Then the master signal, the secondary signal and the pilot signal are combined as the digital FM stereo data. | 01-29-2009 |
| 20090268916 | FM TRANSMITTER - An FM transmitter improved in degree of freedom of selecting components. The FM transmitter comprises an oscillator | 10-29-2009 |
| 20100177902 | Audio transmission system - An audio transmission system of an FM carrier frequency signal conveys an analog audio signal with minimum distortion, high signal to noise ratio, and minimum phase distortion. The system employs digital data processing blocks to generate a VHF FM carrier signal which is subsequently converted to an UHF FM carrier frequency signal for transmission wirelessly to a receiver for reproducing the audio signal. | 07-15-2010 |
| 20110170698 | FREQUENCY MODULATOR AND FM TRANSMISSION CIRCUIT USING THE SAME - An input signal is input via a first resistor to an inverting input terminal of an operational amplifier. A second resistor is provided on a feedback path between an output terminal and the inverting input terminal of the operational amplifier. A control voltage Vcnt output from the operational amplifier is input to a VCO. A frequency divider frequency-divides an output signal Sout of the VCO. A phase comparator compares an output signal from the frequency divider with a reference clock signal and outputs a voltage according to a phase difference. A loop filter removes a high-frequency component of an output voltage Vcp of the phase comparator and outputs the voltage to a non-inverting input terminal of the operational amplifier. | 07-14-2011 |
| 20110194699 | METHOD AND SYSTEM FOR ENHANCED SOUND QUALITY FOR STEREO AUDIO - Aspects of a method and system for enhanced sound quality for stereo audio are provided. In this regard, levels of audio signals received via an FM radio channel may be controlled based on a signal-to-noise ratio (SNR) of the RF channel. The SNR of the FM radio channel may be determined based on signal strength in an unused portion of the FM radio channel. The recovered audio signals may comprise an FM multiplex signal, and an unused portion of the FM radio channel may be a guard band adjacent to a carrier of the FM multiplex signal. A level of one or both of a mono component and a stereo component of an FM multiplex signal may be controlled based on the SNR. | 08-11-2011 |
| 20120155649 | WIRELESS PERSONAL LISTENING SYSTEM AND METHOD - A personal listening system uses the FM broadcast band for transmission and reception. The system includes a base unit and physically separate right- and left-ear listening units. The base unit includes an FM stereo transmitter. Each listening unit demodulates and amplifies the received signal, but the right-ear unit only amplifies the right channel and the left-ear unit only amplifies the left channel. The base unit may be a digital music player, book reader, video player, smart cellular telephone, or any other portable device. The base unit may include a display for displaying the selected FM frequency. The base unit may be a self-contained or integrated unit, or a device that couples to a digital music player, smart cellular telephone or other device to receive the audio signal therefrom. The right- and left-ear listening units may be any type of on-ear, in-ear or around-ear sound delivery devices including earbuds. | 06-21-2012 |
| 20120201387 | FM RADIO RECEIVING APPARATUS - An FM radio receiving apparatus includes a stereo decoder unit | 08-09-2012 |
| 20120207307 | AUDIO SIGNAL OF AN FM STEREO RADIO RECEIVER BY USING PARAMETRIC STEREO - The invention relates to an apparatus for improving a stereo audio signal of an FM stereo radio receiver. The apparatus comprises a parametric stereo (PS) parameter estimation stage. The parameter estimation stage is configured to determine one or more parametric stereo parameters based on the stereo audio signal in a frequency-variant or frequency-invariant manner. Preferably, these PS parameters are time- and frequency-variant. Moreover, the apparatus comprises an upmix stage. The upmix stage is configured to generate the improved stereo signal based on a first audio signal and the one or more parametric stereo parameters. The first audio signal is obtained from the stereo audio signal, e.g. by a downmix operation in a downmix stage. The PS parameter estimation stage may be part of a PS encoder. The upmix stage may be part of a PS decoder. | 08-16-2012 |
| 20120230495 | Silence Based Attenuation for Enhanced Idle-Channel FM or Other Receiver Co-Existence with a Coexisting Radio and Circuits, Processes, and Systems - An electronic circuit ( | 09-13-2012 |
| 20130182851 | PROCESSOR FOR AN FM SIGNAL RECEIVER AND PROCESSING METHOD - A processing unit for processing a multi-channel audio signal has a delay element ( | 07-18-2013 |
| 20130279700 | Undetectable Combining of Nonaligned Concurrent Signals - The approach shown provides for an efficient implementation of time response, level response and frequency response alignment between two audio sources such as DAB and FM that may be time offset from each other by as much as 2 seconds, and produces an aurally undetectable transition between the sources. Computational load is significantly reduced over the approaches known in the prior art. | 10-24-2013 |
| 20140072122 | MULTIPATH INTERFERENCE REDUCTION - The invention provides an audio signal processing system in which a magnitude spectrum of a frequency domain audio signal is processed based on a measure of multipath interference. The processing keeps the magnitude spectrum approximately fixed during periods of multipath interference, for example by replacing it with a temporally smoothed version of the magnitude spectrum. The magnitude spectrum (processed if required) and the phase spectrum are combined to derive a frequency domain output, which is transformed to the time domain. | 03-13-2014 |
| 20140355764 | Methods And Systems For Blending Between Analog And Digital Broadcast Signals - Systems and methods are disclosed that may be implemented to process a received RF spectrum that includes both analog modulated and digitally modulated RF signals to blend between a digital demodulated signal and an analog demodulated signal obtained from the received RF spectrum prior to performing one or more signal quality mitigation operations on the blended signal (e.g., such as stereo blend, hi-cut, etc.). In one embodiment, the digital demodulated signal and the analog demodulated signal may include at least some of the same information, e.g., such as information from simulcast digital and analog channels that are obtained from the same received RF spectrum. | 12-04-2014 |
| 20150063571 | SYSTEM FOR THE INTEGRATION OF SIGNAL-TRANSMISSION/-RECEPTION TECHNOLOGIES FOR HIGHWAY USE - The present invention relates to a system that integrates various transmission/reception technologies, e.g. satellite, frequency modulated (FM), etc. for specific highway use, allowing the use of one and the same frequency-modulated frequency along a road in a synchronized manner. | 03-05-2015 |
| 20150078554 | WIRELESS PERSONAL LISTENING SYSTEM AND METHOD - A personal listening system uses the FM broadcast band for transmission and reception. The system includes a base unit and physically separate right- and left-ear listening units. The base unit includes an FM stereo transmitter. Each listening unit demodulates and amplifies the received signal, but the right-ear unit only amplifies the right channel and the left-ear unit only amplifies the left channel. The base unit may be a digital music player, book reader, video player, smart cellular telephone, or any other portable device. The base unit may include a display for displaying the selected FM frequency. The base unit may be a self-contained or integrated unit, or a device that couples to a digital music player, smart cellular telephone or other device to receive the audio signal therefrom. The right- and left-ear listening units may be any type of on-ear, in-ear or around-ear sound delivery devices including earbuds. | 03-19-2015 |
| 381004000 | AM subcarrier | 10 |
| 20110243333 | BTSC ENCODER - The disclosed BTSC encoder includes a left high pass filter means for receiving a digital left channel audio signal and for digitally high pass filtering the digital left channel audio signal and thereby generating a digital left filtered signal; a right high pass filter means for receiving a digital right channel audio signal and for digitally high pass filtering the digital right channel audio signal and thereby generating a digital right filtered signal; a matrix means for receiving the digital left and digital right filtered signals, and including means for summing the digital left and digital right filtered signals and thereby generating a digital sum signal, and including means for subtracting one of the digital left and digital right filtered signals from the other of the digital left and digital right filtered signals and thereby generating a digital difference signal; a difference channel processing means for digitally processing the digital difference signal; and a sum channel processing means for digitally processing the digital sum signal. | 10-06-2011 |
| 20120087502 | BTSC ENCODER - The disclosed BTSC encoder includes a left high pass filter means; a matrix means for receiving the digital left and digital right filtered signals, and including means for summing the digital left and digital right filtered signals and thereby generating a digital sum signal, and including means for subtracting one of the digital left and digital right filtered signals from the other of the digital left and digital right filtered signals and thereby generating a digital difference signal; a difference channel processing means for digitally processing the digital difference signal; and a sum channel processing means for digitally processing the digital sum signal. | 04-12-2012 |
| 381007000 | Switch-type detector or modulator | 1 |
| 20090310791 | METHOD FOR PROCESSING AN INPUT COMPOSITE SIGNAL AND SIGNAL PROCESSING APPARATUS THEREOF - A method for processing an input composite signal includes tracking a signal component of the input composite signal according to a frequency of a pilot signal to generate a locked signal, detecting an amplitude of the signal component to generate a detecting result, and generating a reproduced pilot signal according to the detecting result and the locked signal. A frequency and a phase of the locked signal are substantially identical to the frequency and a phase of the pilot signal. | 12-17-2009 |
| 381010000 | Channel separation control | 2 |
| 20080253576 | METHOD AND APPARATUS FOR ENCODING AND DECODING STEREO SIGNAL AND MULTI-CHANNEL SIGNAL - Provided are a method and apparatus for encoding and decoding a stereo signal or a multi-channel signal. According to the method and apparatus, a stereo signal or a multi-channel signal can be encoded and/or decoded by generating parameters based on a mono signal. | 10-16-2008 |
| 20160163330 | ELECTRONIC DEVICE AND CONTROL METHOD - According to one embodiment, an electronic device includes a receiver and a hardware processor. The receiver is configured to receive an audio signal. The hardware processor is configured to enable a first function comprising separating the audio signal into a voice signal and a background sound signal and emphasizing or suppressing either the voice signal or the background sound signal and enable a second function comprising giving an acoustic effect to the audio signal. The hardware processor is further configured to receive an user operation to turn on either the first function or the second function and restrict the second function, if the first function is turned on. | 06-09-2016 |
| 381013000 | Antinoise | 5 |
| 20120224699 | FM RECEIVER NOISE REDUCTION - Apparatus to reduce noise in a stereo FM broadcast received via an antenna, the apparatus comprising: a frequency translator configured to translate the received stereo FM broadcast to an intermediate carrier frequency, a demodulation unit configured to demodulate the translated FM signal so as to form left-plus-right and left-minus-right AM signals, a filter configured to form a filtered signal by filtering one of the AM signals, so as to suppress a sub-band of that signal containing unwanted tones, a summing unit for summing the filtered signal and the other of the left-plus-right and left-minus-right signals to produce a stereo audio signal. | 09-06-2012 |
| 20130243198 | METHOD FOR REDUCING NOISE INCLUDED IN A STEREO SIGNAL, STEREO SIGNAL PROCESSING DEVICE AND FM RECEIVER USING THE METHOD - Method for reducing noise included in a stereo reproduction signal derived from a stereo input signal characterized by the steps of: *varying stereo channel separation of said stereo reproduction signal with frequency within the frequency range of the stereo input signal in accordance with the frequency response of a filter selectivity located around a center frequency to obtain a stereo channel separation peak value at said center frequency; *at a continuing increase of said noise, decreasing the bandwidth of said filter selectivity to a pre-determined non-zero bandwidth while maintaining the channel separation within the bandwidth of said filter selectivity substantially at said channel separation peak value. | 09-19-2013 |
| 20140219454 | SIGNAL PROCESSING APPARATUS - A signal processing apparatus ( | 08-07-2014 |
| 20140348328 | SIGNAL QUALITY ESTIMATION AND CONTROL - Several circuits and methods implemented to perform signal quality estimation and control are disclosed. In an embodiment, a method of signal quality estimation includes generating a demodulated signal associated with a radio signal. Information associated with a quality of the demodulated signal is accessed. Further, a value of radio frequency signal-to-noise ratio (RF-SNR) for the radio signal based on the information is estimated. Estimating the value of RF-SNR facilitates in signal quality estimation of the radio signal and control of the demodulated signal. | 11-27-2014 |
| 20160020798 | SYSTEMS AND METHODS FOR ENHANCING AUDIO QUALITY OF FM RECEIVERS - Systems and methods are described for enhancing the audio quality of an FM receiver. In embodiments described herein, a stop band noise signal is extracted from an L+R or L−R signal produced by an FM stereo decoder. A channel quality measure is calculated based on the stop band noise signal and is used to control whether a pop suppression technique is applied to the L+R signal. The channel quality measure and the stop band noise signal are also leveraged to perform single-channel noise suppression in the frequency domain on the L−R signal and on the L+R signal. The channel quality measure is also used to control the application of a fast fading compensation process that replaces noisy segments of the L−R and L+R signal with replacement waveforms generated via waveform extrapolation. | 01-21-2016 |
