| Patents for H03G 5 - Tone control or bandwidth control in amplifiers (3,156) |
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| 09/17/1991 | US5050217 Dynamic noise reduction and spectral restoration system |
| 09/17/1991 | US5050216 Effector for electronic musical instrument |
| 09/03/1991 | US5046107 Input level adjusting circuit |
| 09/03/1991 | US5046106 Varying loudspeaker spatial characteristics in a vehicle |
| 09/03/1991 | US5046105 Audio signal equalizer having accelerated slope phase shift compensated filters |
| 09/03/1991 | US5046101 Audio dosage control system |
| 09/03/1991 | US5045802 Frequency characteristic setting circuitry for an amplifier |
| 08/28/1991 | EP0443170A2 Method and circuit for IF-band width switching |
| 08/27/1991 | US5043676 Automatic level control circuit |
| 08/20/1991 | US5041793 Controlled slew rate amplifier |
| 08/13/1991 | US5040220 Control circuit for controlling reproduced tone characteristics |
| 08/07/1991 | EP0307465A4 Semiconductor emulation of tube amplifiers |
| 07/24/1991 | EP0438317A2 Varying loudspeaker spatial characteristics in a vehicle |
| 07/23/1991 | US5034984 Speed-controlled amplifying |
| 07/19/1991 | CA2033887A1 Varying loudspeaker spatial characteristics in a vehicle |
| 07/11/1991 | WO1991010284A1 Correction circuit and method for a two-way loudspeaker system |
| 07/10/1991 | EP0436100A2 Method for controlling audio-visual equipment and apparatus therefor |
| 07/03/1991 | EP0435455A2 Varying bandwidth digital signal detector |
| 07/03/1991 | EP0434691A1 Improvements in or relating to sound reproduction systems. |
| 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 |
| 06/19/1991 | EP0432973A2 Reflection sound compression apparatus |
| 06/11/1991 | US5023913 Apparatus for changing a sound field |
| 06/04/1991 | US5022083 Apparatus and method for compensating component audio signals |
| 05/28/1991 | US5020141 Adaptive identifying signal detector |
| 05/28/1991 | US5019794 Bandpass filter having an adjustable bandwidth |
| 05/21/1991 | CA1284297C Stereo enhancement system |
| 05/14/1991 | CA1284187C Digital equalizer apparatus enabling separate phase and amplitude characteristic modification |
| 05/08/1991 | EP0425745A1 Signal conditioner system for musical instruments |
| 04/30/1991 | US5012490 Varying bandwidth digital signal detector |
| 04/18/1991 | DE3933870A1 Controlling microphones supplied with current over cable audio cores - involves adjustment of supply voltage so that magnitude provides control information |
| 04/17/1991 | EP0422955A2 Sound field control system |
| 04/02/1991 | CA1282344C Low-pitched sound creator |
| 03/27/1991 | EP0419127A2 Noise suppression system |
| 03/21/1991 | CA2025696A1 Noise suppression system |
| 03/13/1991 | EP0416277A2 Audio amplifier with separate tone control for different loudspeaker groups |
| 02/27/1991 | EP0413934A2 Transmission line frequency equalizer |
| 02/27/1991 | EP0215951B1 Graphic balancer |
| 02/19/1991 | US4994770 Tone control device |
| 02/07/1991 | DE3925565A1 Circuit decoupling electronic components - has first ROM with correction matrix, whose elements represent correction magnitudes |
| 01/23/1991 | EP0409259A2 Equalizing and amplifying circuit in an optical signal receiving apparatus |
| 01/10/1991 | DE3921773A1 Car radio with vol control circuit - has electric control plane, controlled by loudness key in microprocessor |
| 01/02/1991 | CA1278527C Automotive sound system |
| 01/01/1991 | US4982435 Automatic loudness control circuit |
| 12/27/1990 | EP0404474A2 Audio signal data processing system |
| 12/25/1990 | US4980914 Sound field correction system |
| 12/18/1990 | CA1278054C Filter adjustment apparatus and method |
| 12/18/1990 | CA1278053C Filter adjustment apparatus and method |
| 12/18/1990 | CA1277920C Tone control system for sampled data signals |
| 12/18/1990 | CA1277919C Sampled data tone control system |
| 12/12/1990 | EP0401244A1 Radio receiver for vehicles |
| 12/05/1990 | EP0400218A2 Recording medium playing apparatus with automatic tonal response setting function |
| 11/28/1990 | EP0399307A2 Autoradio |
| 11/22/1990 | EP0398536A2 Apparatus for controlling acoustical transfer characteristics |
| 11/20/1990 | US4972489 For a motor vehicle characterized by a room width |
| 11/15/1990 | DE4007572A1 Acoustic device for tuner |
| 10/30/1990 | US4967161 Signal processing method and apparatus |
| 10/10/1990 | EP0390971A2 Acoustic characteristic correction circuit in high fidelity amplifier |
| 09/19/1990 | EP0387954A1 Pass-band filter with adjustable band-width |
| 09/04/1990 | US4955058 Apparatus and method for equalizing a soundfield |
| 08/29/1990 | EP0384544A2 Analog-to-digital encoder and digital-to-analog decoder |
| 08/28/1990 | US4952867 Base bias current compensator |
| 08/22/1990 | EP0383325A2 Automatic adjusting circuit for an analog filter |
| 08/21/1990 | CA1273097A1 Hearing aid noise suppression system |
| 07/12/1990 | WO1990007824A1 Electronic audio signal amplifier and loudspeaker system |
| 07/11/1990 | CN1043844A Analogue power generator |
| 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 |
| 07/03/1990 | US4939782 Self-compensating equalizer |
| 06/28/1990 | DE3842982A1 Circuit arrangement for creating de-emphasis |
| 06/27/1990 | EP0374326A1 Audio noise gates |
| 06/26/1990 | US4937875 Audio signal processing apparatus |
| 06/19/1990 | US4934770 Electronic compression system |
| 05/22/1990 | US4928287 Automatic equalizer |
| 05/22/1990 | US4928071 Limiter circuit |
| 05/15/1990 | US4926139 Electronic frequency filter |
| 05/08/1990 | US4924192 Adjusting apparatus for adjusting sound volume or sound quality |
| 05/01/1990 | US4922131 Differential voltage threshold detector |
| 04/25/1990 | EP0365378A1 Electronic apparatus for processing a sound signal |
| 04/24/1990 | US4920569 Digital audio signal playback system delay |
| 04/10/1990 | US4916409 Signal conditioner system for musical instruments |
| 03/28/1990 | EP0134221B1 Tunable active filter |
| 03/28/1990 | CN1040880A Frequency compensated linear sliding band network |
| 03/27/1990 | US4912393 Voltage regulator with variable reference outputs for a hearing aid |
| 03/22/1990 | DE3927873A1 Interference suppressor for neighbouring channel of FM receiver - has two detectors amplifying and demodulating IF signals arriving from wide and narrow band filters respectively |
| 03/21/1990 | CN1040719A Alternating current amplifier with digitally controlled frequency response |
| 03/20/1990 | US4910799 Noise reduction apparatus |
| 03/08/1990 | WO1990002446A1 Frequency-compensated linear sliding-band network |
| 03/07/1990 | EP0356885A2 Frequency-compensated linear sliding band network |
| 03/06/1990 | US4907293 Adjacent channel interference suppressing system for FM receiver |
| 02/20/1990 | US4903307 Audio apparatus having electronic graphic equalizer |
| 01/25/1990 | WO1990000851A1 Improvements in or relating to sound reproduction systems |
| 01/16/1990 | US4894566 Noise reduction circuit |
| 01/02/1990 | US4891841 Reciprocal, subtractive, audio spectrum equalizer |
| 12/28/1989 | DE3920028A1 Two-channel hearing aid with automatic game control of low signals |
| 12/27/1989 | EP0347719A2 Audio apparatus having electronic graphic equalizer |
| 12/20/1989 | EP0347031A2 Adjusting apparatus for adjusting sound volume or sound quality |
| 12/19/1989 | US4888809 Method of and arrangement for adjusting the transfer characteristic to two listening position in a space |
| 12/19/1989 | US4888808 Digital equalizer apparatus enabling separate phase and amplitude characteristic modification |
| 12/19/1989 | US4888789 Adjustable equalizer for compensating for high frequency rolloff and typical AM receivers |
| 12/19/1989 | US4888560 Gain-variable amplifier circuit |