| 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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| 08/12/1980 | CA1083705A1 Amplitude limiting circuit for frequency modulated video signals |
| 04/29/1980 | US4200889 Complementary pre-emphasis and de-emphasis circuits for a video signal transfer channel |
| 02/26/1980 | US4190806 Circuit arrangement for the selective compression or expansion of the dynamic range of a signal |
| 02/05/1980 | US4187478 Noise reduction system having specific encoder circuitry |
| 02/05/1980 | US4187477 Noise reduction system |
| 01/29/1980 | US4186273 Stereophonic system having power amplifiers and speakers in a bridge circuit with capacitor connecting junction of speakers to common terminal |
| 12/18/1979 | US4179669 Amplifying and equalizing |
| 12/04/1979 | US4177356 Signal enhancement system |
| 09/18/1979 | US4168472 Variable gain controller |
| 08/28/1979 | CA1061255A1 Real time amplitude control of electrical waves |
| 08/21/1979 | US4165495 Circuit system for reproducing a signal from a moving record carrier |
| 07/24/1979 | US4162462 Noise reduction system |
| 03/20/1979 | US4145664 Audio signal compression and expansion system |
| 01/23/1979 | US4136314 Adaptive signal weighting system |
| 01/23/1979 | US4135590 Noise suppressor system |
| 10/10/1978 | US4119814 Hearing aid with adjustable frequency response |
| 10/03/1978 | US4118604 Loudness contour compensated hearing aid having ganged volume, bandpass filter, and compressor control |
| 09/12/1978 | US4114180 Closed loop laser noise elimination for optoelectronic recording |
| 09/12/1978 | US4114115 Compandor apparatus |
| 09/05/1978 | US4112254 Signal compander system |
| 07/18/1978 | US4101849 Adaptive filter |
| 07/18/1978 | US4101840 Volume control arrangement for an electro-acoustic system |
| 07/04/1978 | US4099134 Amplifier with controllable transmission factor and switchable control characteristic |
| 07/04/1978 | US4099035 Hearing aid with recruitment compensation |
| 05/23/1978 | US4091414 Forward locking infrared video processing system having a scene dynamic range expander |
| 02/28/1978 | US4076959 Volume, tone and balance control for multi-channel audio systems |
| 02/07/1978 | US4072914 Compression and expansion system with enlarged dynamic range |
| 02/07/1978 | US4072906 Variable gain amplifier with adjustable upper frequency limit |
| 01/17/1978 | US4069461 Amplifier circuit having two negative feedback circuits |
| 01/10/1978 | US4068139 IC compatible variable shunt impedance for Dolby B system |
| 01/03/1978 | US4066976 Amplifier with variable gain |
| 12/20/1977 | US4064537 Amplitude limiting circuit for frequency modulated video signals |
| 12/06/1977 | US4061874 System for reproducing sound information |
| 08/30/1977 | US4045748 Audio control system |
| 07/05/1977 | US4034308 Amplifier with controllable transmission factor and switchable control characteristic |
| 06/21/1977 | US4031319 Single control power-frequency control circuit |
| 05/24/1977 | US4025723 Real time amplitude control of electrical waves |
| 01/04/1977 | US4001732 Calibration oscillators for noise reduction systems |
| 01/04/1977 | US4001731 Device for optionally realizing two mutually complementary functions |
| 11/02/1976 | US3989897 Method and apparatus for reducing noise content in audio signals |
| 09/28/1976 | US3983505 Signal frequency band control system |
| 09/14/1976 | US3980964 Noise reduction circuit |
| 08/31/1976 | US3978409 Signal compressors and expanders |
| 08/24/1976 | US3977023 Tape recorder |
| 07/27/1976 | US3972010 Compressors, expanders and noise reduction systems |
| 07/13/1976 | US3969680 Automatic dynamic compander system |
| 06/29/1976 | US3967219 Signal compressors and expanders |
| 03/23/1976 | US3946249 Signal control circuit |
| 03/16/1976 | US3944853 Video recorder pre-emphasis, de-emphasis circuits |
| 01/20/1976 | US3934190 Signal compressors and expanders |