| 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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| 06/25/1985 | US4525684 Auto-equalizer apparatus |
| 06/18/1985 | CA1188996A1 Circuit arrangements for modifying dynamic range |
| 06/11/1985 | US4523156 Anti-distortion anti-transient tone control circuit |
| 06/04/1985 | CA1188384A1 Noise reduction circuit |
| 05/14/1985 | US4517415 Hearing aids |
| 05/09/1985 | WO1985002085A1 Hearing aid amplification method and apparatus |
| 04/24/1985 | EP0138548A2 Analog-to-digital encoder and digital-to-analog decoder |
| 04/24/1985 | EP0138547A2 Spectral emphasis and de-emphasis circuits |
| 04/23/1985 | US4513242 Electronic impedance device for providing a variable impedance |
| 03/26/1985 | US4507791 Analog and digital signal apparatus |
| 02/05/1985 | US4498060 Circuit arrangements for modifying dynamic range using series arranged bi-linear circuits |
| 02/05/1985 | US4498055 Circuit arrangements for modifying dynamic range |
| 01/31/1985 | WO1985000478A1 Circuit with adjustable amplitude and rolloff frequency characteristics |
| 01/16/1985 | EP0131033A1 Method and means for processing speech |
| 01/09/1985 | EP0130815A2 Noise reduction circuit and method |
| 01/09/1985 | EP0130613A2 Noise reduction circuit |
| 01/08/1985 | US4493091 Analog and digital signal apparatus |
| 12/25/1984 | US4490843 Dynamic equalizing |
| 12/25/1984 | US4490691 Compressor-expander circuits and, circuit arrangements for modifying dynamic range, for suppressing mid-frequency modulation effects and for reducing media overload |
| 11/20/1984 | CA1178210A1 Noise reduction circuit |
| 11/13/1984 | CA1177759A1 Circuit arrangements for modifying dynamic range |
| 10/09/1984 | US4476502 Noise reduction system |
| 09/26/1984 | EP0119645A1 Automatic equalizing system with discrete Fourier transform (DFT) or fast Fourier transform (FFT) |
| 09/25/1984 | US4473852 Noise reduction system |
| 09/11/1984 | US4471318 Circuit for noise reduction particularly useful with signal recording/reproducing apparatus |
| 08/21/1984 | US4467287 Signal expander |
| 08/14/1984 | US4466119 Audio loudness control system |
| 08/14/1984 | US4466118 Dual range audio level control |
| 07/24/1984 | US4462008 Noise reduction circuit having voltage to current converting means in the auxiliary channel |
| 07/19/1984 | WO1984002793A1 Method and means for processing speech |
| 07/18/1984 | EP0113370A1 Environment-adaptive loudspeaker systems |
| 07/17/1984 | US4460871 Multiband cross-coupled compressor with overshoot protection circuit |
| 06/26/1984 | US4457014 Signal transfer and system utilizing transmission lines |
| 05/29/1984 | US4451746 Non-linear emphasis circuit |
| 05/15/1984 | US4449106 Noise reducing apparatus |
| 04/10/1984 | US4442546 Noise reduction by integrating frequency-split signals with different time constants |
| 04/03/1984 | US4441084 Noise reduction circuit |
| 04/03/1984 | US4441083 Noise reduction circuit |
| 03/20/1984 | US4438414 Tone control circuit |
| 02/07/1984 | US4430754 Noise reducing apparatus |
| 01/31/1984 | CA1161561A1 Noise reduction circuit |
| 01/31/1984 | CA1161560A1 Noise reduction circuit |
| 01/24/1984 | US4427950 Noise reduction circuit |
| 01/19/1984 | WO1984000274A1 Environment-adaptive loudspeaker systems |
| 12/20/1983 | US4422047 Solid state autotune power amplifier |
| 12/06/1983 | CA1158172A1 Noise reduction circuit |
| 12/06/1983 | CA1158171A1 Circuit for noise reduction particularly useful with signal recording/reproducing apparatus |
| 10/26/1983 | EP0091996A1 An electric circuit for detecting the maximum value of a plurality of input currents and a signal processing circuit employing it. |
| 10/25/1983 | US4412189 Switchable signal compressor/signal expander |
| 10/25/1983 | US4412100 Multiband signal processor |
| 09/27/1983 | US4406923 Automatic loudness controller |
| 09/06/1983 | CA1153315A1 Signal compression and expansion system |
| 08/23/1983 | US4400583 Complete audio processing system |
| 08/02/1983 | US4396893 Frequency selective limiter |
| 07/26/1983 | CA1150638A1 Gain control circuit for noise reduction system |
| 05/31/1983 | CA1147267A1 Gain control circuit for noise reduction system |
| 05/04/1983 | EP0078130A2 Automatic loudness controller |
| 04/27/1983 | EP0077688A1 Improvements in or relating to hearing aids |
| 03/15/1983 | US4376916 Signal compression and expansion system |
| 03/15/1983 | CA1142859A1 Sound reproduction in a space with an independent sound source |
| 03/03/1983 | WO1983000787A1 System for maximum efficiency transfer of modulated signals utilizing line systems |
| 01/25/1983 | US4370681 Gain control circuit for noise reduction system |
| 01/18/1983 | US4369509 Gain control circuit for noise reduction system |
| 01/11/1983 | US4368435 System for maximum efficient transfer of modulated audio frequency energy |
| 01/11/1983 | CA1139433A1 Video signal recording and/or reproducing apparatus |
| 12/21/1982 | CA1137879A1 Compander for changing over to different compander characteristics |
| 12/07/1982 | US4363007 Noise reduction system having series connected low and high frequency emphasis and de-emphasis filters |
| 12/07/1982 | US4363006 Noise reduction system having series connected variable frequency filters |
| 10/12/1982 | US4354209 Recording/playing circuit |
| 10/05/1982 | US4353035 Circuit for compression or expansion of an electrical signal |
| 09/15/1982 | EP0060188A1 Volume and tone control circuit including loudness control without an additional filter |
| 09/07/1982 | CA1131356A1 Analog recording on magnetic media |
| 09/07/1982 | CA1131355A1 Signal processing circuit |
| 06/29/1982 | US4337445 Compander circuit which produces variable pre-emphasis and de-emphasis |
| 06/29/1982 | US4337440 Electronic cascade circuit comprising a circuit having controllable transfer characteristics and a two-port |
| 05/26/1982 | EP0052544A1 Tone control circuit |
| 04/27/1982 | US4327331 Audio amplifier device |
| 04/27/1982 | CA1122702A1 Analog recording on magnetic media |
| 04/20/1982 | US4326223 Video signal recording and/or reproducing apparatus with gain control |
| 04/15/1982 | WO1982001290A1 System for maximum efficient transfer of modulated audio frequency energy |
| 03/30/1982 | US4322579 Sound reproduction in a space with an independent sound source |
| 03/16/1982 | US4320534 Loudness control circuit |
| 03/09/1982 | US4319205 Control voltage generator for a system for dynamic compression or expansion |
| 02/02/1982 | CA1117432A1 Amplifying and equalizing |
| 12/15/1981 | US4306202 Compander |
| 12/15/1981 | US4306201 Signal processing circuit |
| 12/09/1981 | EP0041310A1 An electronic circuit for signal compression and expansion |
| 12/01/1981 | US4303952 Recording and reproducing system |
| 12/01/1981 | US4303891 Monolithic integrated circuit with frequency dependent amplification |
| 11/10/1981 | CA1112360A1 Circuit system for reproducing a signal from a moving record carrier |
| 09/01/1981 | US4287491 Circuit for selectively obtaining automatic dynamic compression or expansion |
| 07/28/1981 | US4281346 Complementary pre-emphasis and de-emphasis circuits for a video signal transfer channel |
| 07/28/1981 | US4281295 Noise reducing apparatus |
| 05/26/1981 | US4270103 Amplifier having a variable propagation constant |
| 04/21/1981 | US4263624 Analog recording on magnetic media |
| 02/03/1981 | US4249042 Multiband cross-coupled compressor with overshoot protection circuit |
| 12/30/1980 | USRE30468 Signal compressors and expanders |
| 12/02/1980 | CA1090707A1 Adaptive filter for companding system |
| 10/07/1980 | US4227048 Audio signal transmission circuit having a constant level tone-controlled output signal |
| 09/23/1980 | US4224581 Compander system having limiter in compressor and expander |