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| Number | Title | Issue Date |
| 7715567 | Noise reduction in a stereo receiver A method of denoise a stereo signal comprising a stereo sum signal and a stereo difference signal, performs a frequency selective stereo to mono blending based on the masking effect of the human auditory system. Therefore, a stereo signal noise reducer, comprising a... | 05/11/2010 |
| 7706542 | Noise removal device It is an object of the present invention to provide an improved noise removal device having an improved noise removal precision. A second noise extracting unit extracts a noise of an IF signal, and outputs a second noise signal which is then smoothed by a second noi... | 04/27/2010 |
| RE40960 | Switched signal processing circuit An expander circuit for decoding audio signals which were encoded in accordance with the BTSC multichannel sound system standard including DBX commanding is presented. A wideband expander circuit is utilized and a DBX expander can be accommodated. The wideband expan... | 11/10/2009 |
| 7382887 | Method and device for reducing high frequency error components of a multi-channel modulator A method and device for reducing error components of a multi-channel modulator. The method comprises the steps of inverting substantially half of the channels of a modulator, and reducing error components between said inverted channels and said non inverted channels... | 06/03/2008 |
| 7366488 | Digital carrier-recovery scheme for FM stereo detection Systems and techniques for digital processing of FM signals. Digital processing may include recovering a carrier signal at a second frequency based on a reference signal at a first frequency. ... | 04/29/2008 |
| 7366264 | Method and system for reducing noise in a multi-carrier signal A receiver 100 for receiving a multi-carrier signal comprises detection means for detecting 801 the presence of impulse interference within the signal and identifying one or more samples of the signal affected by the impulse interference, means for sel... | 04/29/2008 |
| 7362872 | Method for noise reduction of a FM signal A compander for noise reduction of a FM signal is described, wherein a group delay (τ) linked to the generation of the compressor gain (cc(t)) is equalised during generation of the multiplex signal (m(t)), and a group delay (τ) linked to the generation ... | 04/22/2008 |
| 7359686 | Radio-frequency amplifier system A device for measuring voltage levels includes a root mean square (RMS) detector. The RMS detector includes a linear multiplier, a log converter, a low-pass filter and a temperature compensator. The linear multiplier multiplies a voltage of an input signal by the vo... | 04/15/2008 |
| 7343281 | Processing of multi-channel signals A method of generating a monaural signal (S) includes a combination of at least two input audio channels (L, R). Corresponding frequency components from respective frequency spectrum representations for each audio channel (L(k), R(k)) are summed to provide a set of ... | 03/11/2008 |
| 7343143 | Radio receiver with operation state setting unit There is provided a radio receiver which can set a proper receive state regardless of the existence of an adjacent station. If an adjacent station detection circuit detects an IBOC station having a carrier frequency adjacent to a receive frequency, a control unit tr... | 03/11/2008 |
| 7340272 | Mobile communication terminal having a three-dimensional surround sound effect and its control method A mobile communication terminal with three-dimensional surround-sound effect system has a data processing section for coding and modulating a transmitting signal or demodulating and decoding a receiving signal, and an audio processing section for reproducing an audi... | 03/04/2008 |
| 7330518 | Distortion compensation circuit, and a transmission apparatus including the same Predistortion effective for a power amplifier with the memory effect is provided. An A/D converter digitizes a signal voltage value after quadrature modulation, and the result is supplied to a subtractor. A lookup table outputs voltage value data in accordance with ... | 02/12/2008 |
| 7313240 | Noise reduction in a stereo receiver comprising an expander A FM broadcast compander system is combined with a conventional denoising system suited for FM receiver, wherein a noise indicator is determined by a subtraction of the conventionally transmitted difference signal Ud(z) from the additionally transmitted d... | 12/25/2007 |
| 7305046 | I/Q modulator with carrier predistortion An I/Q modulator used for processing an I/Q signal to obtain a predistorted output signal. The I/Q signal has an I component and a Q component, and comprises a predistorter for predistorting, with a predistortion signal, a carrier signal, which comprises a first sub... | 12/04/2007 |
| 7302024 | Method of and apparatus for detecting impulsive noise, method of operating a demodulator, demodulator and radio receiver In a digital receiver for receiving COFDM modulated television signals or the like, consecutive samples are compared with a detection threshold and the number of samples having amplitudes greater than the threshold is determined. This is compared with a further thre... | 11/27/2007 |
| 7295628 | Stereo multiplex encoder (MPX) for FM transmission A stereo multiplex encoder (MPX) for FM transmission with a digital signal processor utilizes residual sideband modulation in stereo transmission instead of the conventional double sideband modulation. The adjustment of the sampling frequency to the modulation frequ... | 11/13/2007 |
| 7292694 | Noise reduction in a stereo receiver A method to denoise a stereo signal which comprises a stereo sum signal (Us(z)) and a stereo difference signal (Ud(z)), wherein a stereo to mono blending on basis of an attenuation of the stereo difference signal (Ud(z)) is performed... | 11/06/2007 |
| 7239710 | Stereo radio receiver with noise suppression For the purpose of largely suppressing the noise pulses caused in a stereo radio receiver in the reception signal, particularly by the ignition system of a motor vehicle, a digital field strength signal representing the analog field strength signal is produced for e... | 07/03/2007 |
| 7233833 | Method of modifying low frequency components of a digital audio signal A method of modifying low frequency components of a digital audio signal having left and right channel signals, including the steps of: a) filtering the left and right channels signals using respective left and right high-pass filters to form left and right high-pas... | 06/19/2007 |
| 7202731 | Variable distortion limiter using clip detect predictor A system and method for predicting and limiting distortion of an amplified signal is described. The system includes a variable total harmonic distortion (“THD”) clipping predictor, a comparator in communication with the variable THD clipping predictor and a dist... | 04/10/2007 |
| 7177432 | Sound processing system with degraded signal optimization A sound processing system adaptively mixes active matrix decoding and passive matrix processing of incoming audio signals. Mixed output signals are generated with active matrix decoding where the audio signals are stereo. Mixed output signals are generated with pass... | 02/13/2007 |
| 7133478 | Device and method for detecting and suppressing noise A device for detecting and suppressing noise includes a noise detection device that receives and processes an input signal to determine if the input signal contains noise and provides a detected noise signal indicative of whether or not noise is detected in the inpu... | 11/07/2006 |
| 7130433 | Noise reduction apparatus and noise reduction method An apparatus for reducing noise component contained in an input signal has: a detecting device for detecting a level of the noise component; an adjusting device for adjusting a level of the input signal so as to make the level of the noise component equal to or lowe... | 10/31/2006 |
| 7110549 | Noise reduction in a stereo receiver A method to denoise a stereo signal comprising a stereo sum signal and a stereo difference signal, performs a frequency selective stereo to mono blending based on the masking effect of the human auditory system. Therefore, a stereo signal noise reducer, comprising a... | 09/19/2006 |
| 7103122 | Noise canceller A noise canceller for removing noise components from an input signal includes a noise detector which detects a noise component of the input signal and outputs a hold signal which corresponds to duration of the noise component, a first hold circuit which outputs a sa... | 09/05/2006 |
| 7092460 | Digital stereo demultiplexer In a stereo demultiplexer receiving a frequency demodulated stereo-multiplex signal (m(t)) which comprises at least a stereo-difference signal (md(t)), a stereo-sum signal (ms(t)) and a pilot carrier, a PLL-circuit (4) to recover the pil... | 08/15/2006 |
| 7088977 | Wireless communication apparatus and wireless communication method A wireless communication apparatus is provided in which a wireless part receives multipath detection information sent from a wireless communication apparatus at the other end (a mobile station, for example) and provides the multipath detection information to a multi... | 08/08/2006 |
| 7065217 | Apparatus and method for multichannel sound reproduction system The sound reproduction of a multichannel sound reproduction system with a plurality of speakers which is connected to the output of an FM stereo receiver is controlled by a control signal derived from the reception quality. Preferably, the control signal from the FM... | 06/20/2006 |
| 7046811 | Stereo demultiplexer For the noise reduction of an audio signal generated by stereo-demultiplexing of a frequency-modulated stereo multiplex signal (SFM(t)) a filtering within the signal path to generate the stereo difference signal (ud(t)) is performed that determ... | 05/16/2006 |
| 7043026 | Method for removing AM neighboring interference and a circuit for the same An AM neighboring interference removing method and circuit is provided which can select only a desired AM modulation wave even if an interference AM modulation wave is partially superposed upon the desired AM modulation wave. An AM modulation wave desired to be rece... | 05/09/2006 |
| 6980060 | Adaptive method and apparatus to control loop bandwidth of a phase lock loop Disclosed is a PLL (Phase Lock Loop) reducing the lock-in-time of the phase lock loop by altering the impedance of the damping resistor portion of the included LPF (Low Pass Filter) as a function of the difference in frequency or phase between a PLL applied referenc... | 12/27/2005 |
| 6944301 | Method and apparatus for discriminating multipath and pulse noise distortions in radio receivers Distortion discrimination circuitry for digital radio receivers and corresponding methods are disclosed that accurately and efficiently discriminate distortion events, including impulse noise and multipath distortion events, to improve the quality of audio output si... | 09/13/2005 |
| 6925114 | Weak signal processing based on impulse noise blanking An improved noise reduction system (20) is provided for a radio frequency audio processor having one or more weak signal processing components for generating one or more corresponding control values (36a, 36b) for controlling chara... | 08/02/2005 |
| 6914903 | Apparatus and method for transmitting or receiving an uncompressed packet followed by compressed packets A data transmission apparatus for sequentially transmitting data in units of packets each containing transmission data to the receiving end, comprises: a reception unit for receiving the transmission data as an input signal; a packet formation unit for receiving the... | 07/05/2005 |
| 6914987 | Audio amplifier with voltage limiting in response to spectral content Audio signals are reproduced with consistent perception of total harmonic distortion even with varying spectral content of a particular audio signal without separately limiting different frequency bands within the audio signal. A distortion threshold representative ... | 07/05/2005 |
| 6813359 | Apparatus and method for minimizing multipath interference A method and apparatus for minimizing multipath interference for commercial FM signals which use SCA secondary signals in QAM format that includes tracking the time series of phase measurements of a received stereo pilot signal for determining the proper phase refer... | 11/02/2004 |
| 6690805 | Audio signal noise reduction system An audio signal noise reduction system comprises a noise detecting circuit 11 for detecting a noise from an audio signal and outputting a detection signal indicating a start time and an end time of a noise period of the noise, an LPF 12 for extracting a l... | 02/10/2004 |
| 6671378 | Detection of noise in a frequency demodulated FM audio broadcast signal The noise in a frequency demodulated audio signal is detected on basis of the characteristics of the stereo-multiplex signal to obtain a very reliable information that can be used for the sliding stereo-mono transition, noise blanking and a de-noising of ... | 12/30/2003 |
| 6658116 | Stereo radio receiver A stereo radio receiver has a channel separation stage for setting an optimal channel separation of the left audio channel from the right audio channel, even under sufficient receiving field strength following a time of multipath reception for the duratio... | 12/02/2003 |
| 6654471 | Method, equipment and recording device for suppressing pulsed interference in analogue audio and/or video signals Clicks in voice and music signals are removed by detecting and interpolating the click. The use of a permanently set threshold value above the peak value of the audio signal is known for detecting the clicks, and interpolation carried out on the basis of ... | 11/25/2003 |
