| Patents for H03G 5 - Tone control or bandwidth control in amplifiers (3,156) |
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| 02/03/1998 | US5715527 Mobile communication device having an output power sensor succeeding a transmission filter |
| 02/03/1998 | US5714918 Equalizer for digitized signals |
| 01/28/1998 | EP0821480A2 Device for modification of the cut-off frequency of a lowpass filter |
| 01/28/1998 | EP0821479A2 Filter circuit and audio signal processor comprising the same |
| 01/27/1998 | US5712591 Parallel preamplifier and equalizer |
| 01/14/1998 | EP0772764B1 Process and device for determining the tonality of an audio signal |
| 12/31/1997 | CN1169061A Amplifier circuit for sound frequency signal |
| 12/10/1997 | EP0811272A1 Amplifier with controllable amplification rate for amplifying electric signals in a predetermined frequency range |
| 12/10/1997 | EP0507919B1 Controlled slew rate amplifier |
| 12/09/1997 | US5697083 Diversity receiver |
| 12/09/1997 | CA2107116C Apparatus and method for voice band reduction |
| 11/25/1997 | US5691666 Full threshold FM deviation compression feedback demodulator and method |
| 11/19/1997 | EP0808019A2 Sound adjusting procedure in a frequency range |
| 11/11/1997 | US5687104 Method and apparatus for generating decoupled filter parameters and implementing a band decoupled filter |
| 11/11/1997 | US5686863 Tunable tone control circuit and a device and method for tuning the RC constants |
| 10/29/1997 | EP0803978A2 Tone control device and sound volume/tone control device for reducing noise at the time of tone modification |
| 10/29/1997 | EP0659311A4 Bridge-tap equalizer method and apparatus. |
| 10/21/1997 | US5680468 Methods of and systems for speaker equalization in automotive vehicles having convertible tops |
| 10/14/1997 | US5677960 On-vehicle sound control apparatus |
| 09/30/1997 | US5673003 Amplifier circuit having a variable bandwidth |
| 09/24/1997 | EP0797299A2 Variable gain control |
| 09/21/1997 | CA2200530A1 Variable-gain control |
| 09/17/1997 | EP0795860A2 Apparatus for reproducing audio signals |
| 09/16/1997 | US5668837 Dual-mode radio receiver for receiving narrowband and wideband signals |
| 09/12/1997 | WO1997024858A3 Voice enhancement system and method |
| 09/09/1997 | US5666430 Method and apparatus for leveling audio output |
| 09/04/1997 | WO1997032403A1 Dual-mode radio receiver for receiving narrowband and wideband signals |
| 09/04/1997 | WO1997032394A1 Fat sound creation means |
| 09/04/1997 | CA2247911A1 Dual-mode radio receiver for receiving narrowband and wideband signals |
| 09/02/1997 | US5663673 Output circuit having at least one external transistor |
| 08/13/1997 | EP0788722A1 Apparatus and method of enhancing audio signals |
| 08/12/1997 | US5656972 Method and device for controlling output power of a power amplifier |
| 07/10/1997 | WO1997024858A2 Voice enhancement system and method |
| 07/10/1997 | CA2241903A1 Voice enhancement system and method |
| 06/19/1997 | WO1997022178A1 Tuning circuit |
| 06/19/1997 | DE19547093A1 Circuit for improvement of noise immunity of audio signal |
| 06/18/1997 | EP0779706A2 Circuitry for improving signal to noise ratio |
| 05/27/1997 | US5633940 Audio amplifier arrangement |
| 05/27/1997 | US5633938 Audio track mixing processor |
| 05/14/1997 | EP0772764A1 Process and device for determining the tonality of an audio signal |
| 05/07/1997 | EP0771515A2 Signal amplification system with automatic equalizer |
| 05/07/1997 | CN1149373A Voice enhancement system and method |
| 05/06/1997 | US5627899 Compensating filters |
| 04/29/1997 | US5625322 Amplifier bias control device |
| 04/22/1997 | US5623521 Digital gain controller and gain control method |
| 04/10/1997 | DE19536281A1 Wide-band amplifier device with dc coupled cascade stages e.g. for ultrasonic device |
| 04/02/1997 | CN1146669A Power control circuit or transmission equipment |
| 04/01/1997 | US5617480 DSP-based vehicle equalization design system |
| 04/01/1997 | US5617478 Sound reproduction system and a sound reproduction method |
| 03/25/1997 | CA2107320C Audio signal processing apparatus with optimization process |
| 03/19/1997 | EP0763903A1 Communication apparatus |
| 03/11/1997 | US5610555 Low-voltage driven, audio signal amplifying apparatus and a portable acoustic system using said apparatus |
| 02/25/1997 | US5606735 Slope equalizer using baseband detection |
| 02/25/1997 | US5606625 Digital circuit to regulate the gain of an amplifier stage |
| 02/25/1997 | US5606285 Power control circuit for use with transmitter |
| 02/25/1997 | US5606277 AC coupling loops for current-to-voltage transimpedance amplifiers and methods of using same |
| 02/19/1997 | EP0758817A1 Equaliser for digital signals |
| 02/13/1997 | WO1997005698A1 Automatically switched equalization circuit |
| 02/11/1997 | US5603114 Distortionless receiving circuit |
| 02/05/1997 | CN1142079A Audio-frequency data processing device |
| 01/21/1997 | US5596650 Equalizing circuit for a loudspeaker system |
| 01/21/1997 | US5596646 Audio tape saturation simulator |
| 01/15/1997 | CN1140294A Vocal mix circuit |
| 01/14/1997 | US5594760 Automatic gain control circuit and apparatus including such a circuit |
| 01/09/1997 | WO1996032776A3 Signal amplification system with automatic equalizer |
| 01/07/1997 | US5592545 Voice enhancement system and method |
| 12/11/1996 | EP0748143A2 Stereo enhancement system |
| 12/11/1996 | EP0746393A1 Dual output multi function interface device for audio systems |
| 12/03/1996 | US5581626 Automatically switched equalization circuit |
| 11/20/1996 | EP0743767A2 Audio mixing console |
| 11/20/1996 | EP0743766A2 Audio mixing console |
| 11/14/1996 | DE19510064A1 Satellite receiver for direct reception |
| 11/13/1996 | EP0742641A2 On-vehicle sound control apparatus |
| 11/13/1996 | CN1135682A Control circuit of low input-signal bandwidth compressor and amplifier |
| 11/12/1996 | US5574792 Volume and tone control circuit for acoustic reproduction sets |
| 11/12/1996 | US5574791 Combined de-esser and high-frequency enhancer using single pair of level detectors |
| 11/05/1996 | US5572443 Acoustic characteristic correction device |
| 11/05/1996 | US5572164 FM demodulator with threshold extension and receiver comprising such an FM demodulator |
| 10/30/1996 | EP0740422A2 Power control circuit for transmission apparatus |
| 10/30/1996 | EP0740410A1 Sound quality control system |
| 10/29/1996 | US5570424 Sound effector capable of imparting plural sound effects like distortion and other effects |
| 10/22/1996 | US5568559 Sound processing apparatus |
| 10/17/1996 | WO1996032776A2 Signal amplification system with automatic equalizer |
| 10/15/1996 | US5566237 Time zone equalizer |
| 10/08/1996 | US5564093 Frequency modulation receiving apparatus having two intermediate-frequency band pass filters |
| 10/03/1996 | WO1996031000A1 Sound system gain and equalization circuit |
| 09/25/1996 | EP0734018A2 Audio data processing apparatus |
| 09/18/1996 | EP0732024A1 Voice enhancement system and method |
| 09/18/1996 | EP0732003A1 Fm demodulator with threshold extension and receiver comprising such an fm demodulator |
| 09/04/1996 | CN1130329A Sound circuit |
| 08/29/1996 | WO1996026572A1 Amplifier with controllable amplification rate for amplifying electric signals in a predetermined frequency range |
| 08/28/1996 | EP0729227A1 Vehicle speaker control system |
| 08/28/1996 | CN1129862A Balancer and the audio equipment equipped with the balancer |
| 08/27/1996 | US5550925 Sound processing device |
| 08/22/1996 | WO1996025649A1 Process and device for determining the tonality of an audio signal |
| 08/22/1996 | DE19505697A1 Verstärkereinrichtung zum Verstärken elektrischer Signale in einem vorgegebenen Frequenzbereich mit steuerbarer Verstärkung Amplifier means for amplifying electrical signals in a predetermined frequency range with controllable gain |
| 08/20/1996 | US5548826 Power amplifier and a transmitter including the power amplifier |
| 08/13/1996 | US5546046 Output tube bias selection apparatus for tone alteration in a tube-type audio amplifier |
| 08/07/1996 | EP0724714A1 Vortex flowmeter electronics |
| 07/31/1996 | EP0724329A1 Low input signal bandwidth compressor and amplifier control circuit |