| 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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| 04/13/1994 | CN1085375A Switched signal processing circuit |
| 03/31/1994 | WO1994007341A1 Electroacoustic speech intelligibility enhancement method and apparatus |
| 03/08/1994 | US5293578 Noise reducing device |
| 03/02/1994 | EP0584718A1 Switched signal processing circuit |
| 03/02/1994 | EP0584346A1 Loudspeaker arrangement with frequency dependent amplitude regulation |
| 02/23/1994 | EP0583492A1 Audio signal bass frequency enhancement device |
| 02/08/1994 | US5285169 Monolithic integrated differential amplifier with digital gain setting |
| 01/18/1994 | US5280561 Method for processing audio signals in a sub-band coding system |
| 01/11/1994 | US5278912 Audio frequency signal compressor |
| 12/22/1993 | CN1023278C Audio compressor, expander and noise reduction circuits for consumer and semi-professional use |
| 11/16/1993 | US5263188 In a vehicle sound system |
| 10/28/1993 | DE4300961A1 Multimode multichannel power amplifier for electric musical instrument - can be switched among lead, blues and accompaniment styles executed in separate channels selected by instrumentalist's pedal |
| 10/26/1993 | US5257292 Circuit arrangement for influencing the frequency response of a digital audio signal |
| 10/19/1993 | US5255324 Digitally controlled audio amplifier with voltage limiting |
| 09/16/1993 | WO1993018626A1 Loudspeaker arrangement with frequency dependent amplitude regulation |
| 09/15/1993 | EP0560599A1 Noise suppression apparatus |
| 09/15/1993 | CN1076296A Noise suppression apparatus |
| 09/14/1993 | US5245668 Device for aurally compensated loudness control |
| 08/25/1993 | EP0556992A1 Noise attenuation system |
| 08/11/1993 | EP0554962A1 Tone control circuitry having a frequency characteristic dependent on the input signal level |
| 08/03/1993 | US5233665 Phonetic equalizer system |
| 07/20/1993 | CA2006288C Gain controller |
| 07/13/1993 | US5228091 Loudness control circuit for selectively emphasizing both high frequency and low frequency components |
| 07/01/1993 | WO1993000779A1 An improved multiband programmable compression system |
| 07/01/1993 | CA2111829A1 Multiband programmable compression system |
| 06/24/1993 | DE4141843A1 Signal reproduction control for music and speech signals - identifying music or speech signal characteristic by signal analysis to adjust volume and-or tone setting |
| 06/08/1993 | US5218643 Audio system for vehicle |
| 05/19/1993 | EP0541754A1 Video noise reduction method using non-linear pre/de-emphasis |
| 05/04/1993 | US5208551 Noise reduction circuit with a main signal path and an auxiliary signal path having a high-pass filter characteristic |
| 04/29/1993 | DE4125377C1 Hearing aid with preamplifier and post amplifier - has signal path for upper frequency range with limiter circuit and signal path for lower frequency range with circuit for automatic amplification regulation |
| 03/03/1993 | EP0529119A1 Monolithic integrated amplifier with digital gain control |
| 02/24/1993 | EP0528475A1 Method and apparatus for adjusting tone in a sound system |
| 02/17/1993 | EP0469033B1 Audio compressor, expander, and noise reduction circuits for consumer and semi-professional use |
| 02/11/1993 | DE4126131A1 Audio signal circuitry with adjustable amplitude and frequency path - feeds audio signals to all=pass and filter inputs and superimposes adjustable portions to all=pass and filter outputs |
| 02/09/1993 | US5185806 Audio compressor, expander, and noise reduction circuits for consumer and semi-professional use |
| 12/29/1992 | US5175770 Level control circuit for low and medium sound |
| 12/15/1992 | US5172358 Loudness control circuit for an audio device |
| 12/10/1992 | WO1992022136A1 Video noise reduction method using non-linear pre/de-emphasis |
| 12/10/1992 | CA2088597A1 Video noise reduction method using non-linear pre/de-emphasis |
| 12/01/1992 | US5168526 Distortion-cancellation circuit for audio peak limiting |
| 11/25/1992 | EP0500700A4 High fidelity hearing aid amplifier |
| 11/11/1992 | EP0512365A1 Apparatus for aurally compensated volume regulation |
| 10/27/1992 | US5159284 Noise reduction circuit with a main signal path and an auxiliary signal path having a high-pass filter characteristic |
| 10/20/1992 | US5157396 D/a conversion apparatus |
| 10/08/1992 | DE4125378C1 Hearing aid device with improved speech discrimination characteristics - has amplification setting control fitted between preamplifier and amplifier |
| 09/23/1992 | EP0504988A2 Circuit arrangement to control the frequency response of a digital audio signal |
| 09/02/1992 | EP0500700A1 High fidelity hearing aid amplifier. |
| 08/11/1992 | US5138665 Audio reproduction system |
| 07/21/1992 | CA1305432C Automatic loudness control circuit |
| 07/14/1992 | US5131046 High fidelity hearing aid amplifier |
| 06/30/1992 | US5127058 Gain controller |
| 06/30/1992 | US5126846 Non-linear amplifier and non-linear emphasis/deemphasis circuit using the same |
| 05/19/1992 | US5115471 High frequency expander device |
| 04/29/1992 | EP0482288A1 Electronic volume controller |
| 04/22/1992 | EP0481626A2 D/A conversion apparatus |
| 03/31/1992 | CA1298361C Circuit for automatically controlling the gain-bandwidth product of operational amplifiers |
| 03/19/1992 | DE4029418A1 LF audio frequency response setting circuit - has two adjusters with controllable transmission factors, controlled by two respective adjusting magnitudes |
| 03/18/1992 | EP0475196A2 Method for processing audio signals in a sub-band coding system |
| 03/10/1992 | US5095539 System and method of control tone amplitude modulation in a linked compression-expansion (Lincomplex) system |
| 02/05/1992 | EP0469033A1 Audio compressor, expander, and noise reduction circuits for consumer and semi-professional use. |
| 01/28/1992 | CA1295044C Multi-band programmable compression system |
| 12/25/1991 | CN1015223B Circuit arrangements for modifying dynamic range using action substitution and superposition techniques |
| 12/24/1991 | CA1293454C Noise reduction device in an electroacoustic system |
| 10/15/1991 | US5058168 Overflow speech detecting apparatus for speech recognition |
| 10/08/1991 | CA1290255C Variable preemphasis/deemphasis network |
| 09/23/1991 | CA2034377A1 Mmic gain element with accurate gain |
| 09/03/1991 | US5046106 Varying loudspeaker spatial characteristics in a vehicle |
| 08/27/1991 | US5043676 Automatic level control circuit |
| 07/24/1991 | EP0438317A2 Varying loudspeaker spatial characteristics in a vehicle |
| 07/19/1991 | CA2033887A1 Varying loudspeaker spatial characteristics in a vehicle |
| 07/02/1991 | US5028883 Tone controller for attenuating noise in the signal generated by receiver from weak electric field, and receiver having the tone controller |
| 06/25/1991 | US5027410 Adaptive, programmable signal processing and filtering for hearing aids |
| 06/05/1991 | EP0354955A4 Improved multi-band programmable compression system |
| 05/21/1991 | US5018205 Automatic sound level compensator for a sound reproduction device mounted in a vehicle |
| 05/16/1991 | WO1991007067A1 High fidelity hearing aid amplifier |
| 05/08/1991 | EP0425745A1 Signal conditioner system for musical instruments |
| 05/02/1991 | CA2002092A1 Signal conditioner system for musical instruments |
| 04/10/1991 | EP0421559A2 Device for modifying the dynamic range of an input signal |
| 01/22/1991 | US4987606 Wide band transmission system with biasing of gain control circuit |
| 01/02/1991 | CN1048297A Voice frequency amplifier capable of regulating hearing distance |
| 01/02/1991 | CA1278526C Circuit arrangements for modifying dynamic range using action substitution and superposition techniques |
| 01/02/1991 | CA1278525C Multi-band automatic gain control apparatus |
| 01/01/1991 | US4982435 Automatic loudness control circuit |
| 12/19/1990 | EP0403069A1 Audio amplifier with voltage limiting |
| 12/19/1990 | CN1047946A Audio compressor, expander and noise reduction circuits for consumer and semi-professional use |
| 12/18/1990 | CA1277918C Circuits to provide desired conductance characteristics using a fet |
| 12/12/1990 | EP0401244A1 Radio receiver for vehicles |
| 11/28/1990 | EP0399307A2 Autoradio |
| 10/04/1990 | WO1990012453A1 Audio compressor, expander, and noise reduction circuits for consumer and semi-professional use |
| 08/29/1990 | EP0384544A2 Analog-to-digital encoder and digital-to-analog decoder |
| 07/11/1990 | EP0377165A2 Gain controller |
| 07/10/1990 | US4941179 Method for the regulation of a hearing aid, a hearing aid and the use thereof |
| 07/04/1990 | EP0376933A2 Digital to analog decoder |
| 05/17/1990 | WO1990005437A1 Adaptive, programmable signal processing and filtering for hearing aids |
| 05/15/1990 | CA1269138A1 Attenuator circuit employing bootstrapping |
| 05/01/1990 | US4922535 Transient control aspects of circuit arrangements for altering the dynamic range of audio signals |
| 04/10/1990 | US4916409 Signal conditioner system for musical instruments |
| 03/28/1990 | CN1040880A Frequency compensated linear sliding band network |
| 03/27/1990 | US4912424 Audio amplifier with voltage limiting |
| 03/08/1990 | WO1990002446A1 Frequency-compensated linear sliding-band network |