| Patents for H03G 9 - Combinations of two or more types of control, e.g. gain control and tone control (1,150) |
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| 07/08/2003 | US6590984 Sound quality regulation apparatus |
| 06/25/2003 | CN1112761C Apparatus for compensating frequency characteristic of reproduction audio signal |
| 06/19/2003 | US20030112088 Compander architecture and methods |
| 06/05/2003 | US20030103488 Ambient field level monitor device for radio mobile terminal |
| 05/28/2003 | CN1110130C Apparatus for compensating audio signal recording |
| 05/21/2003 | EP1312162A1 Voice enhancement system |
| 05/01/2003 | US20030081797 Audio processing device |
| 04/29/2003 | US6556559 Ambient field level monitor device for radio mobile terminal |
| 04/24/2003 | WO2002021687A3 System and method for varying levels of low audio frequences inversely with audio signal level |
| 04/16/2003 | CN1411142A 可变增益放大器 Variable gain amplifier |
| 04/08/2003 | US6545534 Low voltage variable gain amplifier with constant input impedance and adjustable one-pole filtering characteristic |
| 04/02/2003 | EP1298795A2 Variable gain amplifier |
| 03/27/2003 | US20030058048 Variable gain amplifier |
| 03/20/2003 | US20030055635 Segmented mapping converter system and method |
| 03/12/2003 | EP0891652B1 Method for automatically adjusting audio response for improved intelligibility |
| 03/06/2003 | WO2003019775A2 Audio processing device |
| 02/20/2003 | US20030035549 Signal processing system and method |
| 02/11/2003 | US6518852 Information signal compressor and expander |
| 01/08/2003 | CN1098559C Method for automatically regualting audio response for improved intelligibility |
| 01/02/2003 | US20030004591 Process for noise reduction, particularly for audio systems, device and computer program product therefor |
| 01/02/2003 | EP1271772A1 A process for noise reduction, particularly for audio systems, device and computer program product therefor |
| 11/21/2002 | US20020173865 Digital audio signal processing |
| 11/21/2002 | US20020172378 Softclip method and apparatus |
| 11/21/2002 | US20020172376 Output processing system and method |
| 11/21/2002 | US20020172374 Noise extractor system and method |
| 11/06/2002 | EP1254513A2 Signal processing system and method |
| 10/10/2002 | WO2002080358A2 Digital audio processor |
| 08/27/2002 | US6442281 Loudness volume control system |
| 08/21/2002 | EP1233509A1 Digital audio processor |
| 08/01/2002 | US20020103619 Statistics generator system and method |
| 08/01/2002 | US20020102001 Sound quality regulation apparatus |
| 07/04/2002 | US20020085725 System output control method and apparatus |
| 06/26/2002 | EP1217732A2 A wireless microphone having a split-band audio companding system that provides improved noise reduction and sound quality |
| 06/20/2002 | US20020076072 Software implemented loudness normalization for a digital hearing aid |
| 06/06/2002 | US20020069051 Speech band division decoder |
| 06/05/2002 | EP1210765A1 Filter banked gain control of audio in a noisy environment |
| 05/02/2002 | US20020051546 Variable attack & release system and method |
| 03/14/2002 | WO2002021687A2 System and method for varying levels of low audio frequences inversely with audio signal level |
| 02/21/2002 | WO2002015395A1 Voice enhancement system |
| 02/06/2002 | EP0862778B1 Audio noise reduction system implemented through digital signal processing |
| 02/05/2002 | CA2280878C An amplifier for continuous high gain, narrowband signal amplification |
| 01/24/2002 | WO2001039370A3 Signal processing system and method |
| 01/01/2002 | US6335973 System and method for improving clarity of audio systems |
| 12/04/2001 | US6327631 Signal processing apparatus |
| 11/22/2001 | DE10017277A1 Setting audio signal loudness correctly for listening involves first damping depending on loudness setting, frequency-selective filtering, second damping and summing damped signals |
| 11/08/2001 | US20010038700 Speaker driving circuit |
| 10/30/2001 | CA2278872C Feed forward amplifier improvement incorporating an automatic gain and phase controller |
| 10/24/2001 | EP0811271B1 Audio amplifier |
| 10/17/2001 | EP0972340B1 Automatic volume control in an audio-signal reproduction facility, and device required |
| 10/16/2001 | US6303922 Range-switching optical receiver with high sensitivity and wide dynamic range |
| 10/10/2001 | EP0862777B1 Dsp decoder for decoding analog sr encoded audio signals |
| 09/27/2001 | DE10011193A1 Compressor circuit for compander system has variable amplifier preceded by pre-attenuator and followed by amplitude limiting device |
| 09/19/2001 | EP1135002A2 Speaker driving circuit |
| 09/19/2001 | CN1313674A Loudspeaker driving circuit |
| 07/12/2001 | US20010007590 Loudness volume control system |
| 06/21/2001 | DE19957220A1 An den aktuellen Geräuschpegel adaptierte Geräuschunterdrückung At the current noise level adapted noise reduction |
| 06/12/2001 | USRE37223 Dynamic equalizing |
| 06/06/2001 | CN1066872C Low-input-signal bandwidth compressor and amplifier control circuit |
| 05/31/2001 | WO2001039370A2 Signal processing system and method |
| 05/30/2001 | EP1104096A2 Noise suppression adapted to actual Noise Level |
| 03/20/2001 | US6205225 Lower sideband modulation distortion cancellation |
| 03/14/2001 | EP1083656A2 Switched signal processing circuit |
| 02/27/2001 | US6195439 Voice signal processor |
| 02/08/2001 | WO2001010020A1 Filter banked gain control of audio in a noisy environment |
| 12/06/2000 | CN1059298C Audio amplifier |
| 11/02/2000 | WO2000065872A1 Loudness normalization control for a digital hearing aid |
| 11/02/2000 | CA2372017A1 Loudness normalization control for a digital hearing aid |
| 09/27/2000 | CN1268000A Receiver with internal low-noise high-frequency amplifier |
| 08/22/2000 | US6108428 Tone control device and sound volume/tone control device for reducing noise at the time of tone modification |
| 07/05/2000 | EP1016318A1 Hearing instrument |
| 06/08/2000 | WO2000015001A3 Hearing aid device incorporating signal processing techniques |
| 06/06/2000 | US6072879 Sound field control unit and sound field control device |
| 05/30/2000 | US6069531 Feed forward amplifier improvement incorporating an automatic gain and phase controller |
| 05/02/2000 | US6057735 Amplifier for continuous high gain, narrowband signal amplification |
| 04/05/2000 | CN1249566A Improved circuit of feedforward amplifier incorporated in automatic gain and phase controller |
| 03/16/2000 | WO2000015001A2 Hearing aid device incorporating signal processing techniques |
| 03/08/2000 | EP0984554A2 Feed forward amplifier improvement incorporating an automatic gain and phase controller |
| 03/01/2000 | CN1245997A Duplex feedback control circuit with frequency compensation |
| 02/08/2000 | US6023513 System and method for improving clarity of low bandwidth audio systems |
| 02/02/2000 | EP0976303A1 Method and apparatus for noise reduction, particularly in hearing aids |
| 01/26/2000 | EP0841757A4 Compander-type dynamic noise suppression device |
| 01/19/2000 | EP0972340A1 Automatic volume control in an audio-signal reproduction facility, and device required |
| 01/13/2000 | WO2000002418A1 Hearing instrument |
| 11/17/1999 | CN1046607C 噪声抑制装置 Noise suppression apparatus |
| 11/10/1999 | EP0541754B1 Video noise reduction method using non-linear pre/de-emphasis |
| 08/18/1999 | CN2334122Y Built-in double-stage piezoelectric filter |
| 08/10/1999 | CA2030784C Audio compressor, expander, and noise reduction circuits for consumer and semi-professional use |
| 06/30/1999 | CN1043944C Switched signal processing circuit |
| 06/17/1999 | WO1999030416A1 An amplifier for continuous high gain, narrowband signal amplification |
| 06/16/1999 | CN1220056A Method for automatically regulating audio response for improved intelligibility |
| 06/09/1999 | CA2224261A1 Low phase noise, high q, high gain amplifier in an integrated circuit |
| 06/08/1999 | US5910995 DSP decoder for decoding analog SR encoded audio signals |
| 06/02/1999 | EP0920127A2 Speech band division decoder |
| 05/25/1999 | US5907623 Audio noise reduction system implemented through digital signal processing |
| 05/25/1999 | CA2172365C Automatic gain control circuitry for hearing aids |
| 05/04/1999 | US5901234 Encoding method for encoding an acoustic signal |
| 04/20/1999 | US5896449 Voice enhancement system and method |
| 03/24/1999 | CN1212100A Voice enhancement system and method |
| 03/09/1999 | US5881157 Apparatus for compensating a frequency characteristic of a reproduction audio signal |
| 02/03/1999 | EP0895353A2 Noise reduction system for an audio system |