| Patents for H03G 7 - Volume compression or expansion in amplifiers (2,243) |
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| 01/09/1991 | CN1011185B Nonlinear signal processing apparatus |
| 01/08/1991 | US4983863 Logarithmic amplification circuit for obtaining output voltage corresponding to difference between logarithmically amplified values of two input currents |
| 01/02/1991 | CA1278526C Circuit arrangements for modifying dynamic range using action substitution and superposition techniques |
| 12/27/1990 | EP0404294A1 Levelling control circuit |
| 12/18/1990 | CA1277921C Digital signal gain control circuitry for varying digital signals in substantially equal db steps |
| 12/18/1990 | CA1277918C Circuits to provide desired conductance characteristics using a fet |
| 12/05/1990 | CN1047586A Recording and reproducing method and recording and reproducing apparatuses |
| 11/20/1990 | US4972512 Circuit for linearly amplifying and demodulating an AM-modulated signal, and integrated semiconductor element for such circuit |
| 11/20/1990 | US4972164 Amplitude compressing/expanding circuit |
| 11/08/1990 | DE3914795A1 Voltage controlled amplification of input signal - feeding correction signal for characteristic fault into logarithmic and/or anti-logarithmic paths |
| 10/30/1990 | US4967161 Signal processing method and apparatus |
| 10/10/1990 | EP0391235A1 Analog predistortion circuit |
| 10/04/1990 | WO1990011645A1 Logarithmic amplifier |
| 09/27/1990 | DE3909437A1 Magnetic tape apparatus with automatic level setting |
| 09/26/1990 | EP0388490A1 Level control circuits |
| 09/13/1990 | DE4006416A1 Signal compression circuit - includes polygon circuit for providing current proportional to difference between input and reference voltage, and clipping circuit |
| 09/05/1990 | EP0385782A2 Time dependent, variable amplitude threshold output circuit for frequency variant and frequency invariant signal discrimination |
| 08/28/1990 | US4952867 Base bias current compensator |
| 08/28/1990 | US4952795 Current limiter and an optical receiver making use thereof |
| 08/23/1990 | DE3904648A1 Verfahren und anordnung zur unterdrueckung von unerwuenschten spektren bei einer digitalen dynamikexpansion Method and arrangement for suppressing undesired spectra in a digital dynamic expansion |
| 08/23/1990 | DE3904647A1 Arrangement for dynamic expansion |
| 08/16/1990 | EP0381764A1 Analog operation circuit |
| 08/08/1990 | EP0381215A2 Method and apparatus for reducing noise in a linked compressor-expander telecommunications system |
| 08/07/1990 | US4947133 Method and apparatus for automatic signal level adustment |
| 08/02/1990 | CA2008922A1 Method and apparatus for reducing noise in a linked compressor- expander telecommunications system |
| 07/24/1990 | US4944024 Method and apparatus for reducing noise in a linked compressor-expander telecommunications system |
| 07/11/1990 | EP0377205A1 Current limiter and optical receiver using it |
| 06/19/1990 | US4934770 Electronic compression system |
| 06/12/1990 | US4933641 Extended dynamic range logarithmic if amplifying apparatus and method |
| 05/22/1990 | US4928307 Time dependent, variable amplitude threshold output circuit for frequency variant and frequency invariant signal discrimination |
| 05/16/1990 | EP0367803A1 Noise reduction. |
| 05/15/1990 | US4926485 Output level control apparatus |
| 05/15/1990 | US4926261 Video noise reduction circuit |
| 05/15/1990 | US4926139 Electronic frequency filter |
| 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 |
| 05/01/1990 | US4922131 Differential voltage threshold detector |
| 04/24/1990 | US4920279 Method to expand an analog signal and device to implement the method |
| 04/18/1990 | EP0363714A2 Integrated compression amplifier with a programmable threshold |
| 04/05/1990 | WO1990003699A1 Log-polar signal processing |
| 04/03/1990 | US4914402 Opto-electronic transimpedance amplifier |
| 03/28/1990 | EP0360770A1 Log-polar signal processing |
| 03/27/1990 | US4912393 Voltage regulator with variable reference outputs for a hearing aid |
| 03/14/1990 | CN1007197B Automatic linear compression circuit |
| 02/20/1990 | US4903020 Method and apparatus for digitally processing stored compressed analog signals |
| 02/14/1990 | EP0354734A2 Non-linear amplifier and non-linear emphasis/deemphasis circuit using the same |
| 02/06/1990 | US4899115 System for controlling the dynamic range of electric musical instruments |
| 01/30/1990 | CA1265226A1 Log magnitude pulse interference detection for a radar system |
| 01/24/1990 | EP0351835A2 Logarithmic amplification circuit for obtaining output voltage corresponding to difference between logarithmically amplified values of two input currents |
| 01/17/1990 | EP0350518A1 Photometer |
| 01/17/1990 | CN1038909A Digital deemphasis circuit |
| 01/16/1990 | US4894862 Signal compression circuit, particularly for a telephone set |
| 01/03/1990 | EP0348396A1 Radio receiver speech amplifier circuit. |
| 12/14/1989 | WO1989012280A1 Analog operation circuit |
| 12/13/1989 | EP0345365A1 Digital deemphasis circuit |
| 12/12/1989 | US4887299 Adaptive, programmable signal processing hearing aid |
| 12/05/1989 | US4885483 Logarithmic amplifier |
| 11/21/1989 | US4882761 Low voltage programmable compressor |
| 11/16/1989 | DE3815079A1 Arrangement for dynamic expansion |
| 11/15/1989 | EP0341292A1 Adaptive, programmable signal processing hearing aid |
| 10/26/1989 | DE3833985C1 Dynamic compressor |
| 10/24/1989 | US4876499 Differental voltage controlled exponential current source |
| 09/26/1989 | CA1261959A1 Automatic gain control for hearing aid |
| 09/26/1989 | CA1260562A1 Non-linear amplifier |
| 09/13/1989 | EP0332431A2 Logarithmic amplifier |
| 09/13/1989 | CN1035594A Circuit arrangement for linearly amplifying and demodulating am-modulated signal, and integrated semiconductor element for said circuit arrangement |
| 09/08/1989 | WO1989008371A1 Improved low voltage programmable compressor |
| 09/06/1989 | EP0331246A1 Logarithmic amplifier |
| 09/06/1989 | EP0331234A1 Circuit arrangement for linearly amplifying and demodulating an AM-modulated signal, and integrated semiconductor element for said circuit arrangement |
| 09/05/1989 | US4864627 Microphone mixer with gain limiting and proportional limiting |
| 08/29/1989 | US4862118 Signal processing system using a compressor and an expander |
| 08/22/1989 | US4860366 Teleconference system using expanders for emphasizing a desired signal with respect to undesired signals |
| 08/16/1989 | EP0328346A2 Noise reduction circuits |
| 08/15/1989 | US4857779 Circuit arrangement for reducing noise |
| 08/15/1989 | CA1258499A1 Intermediate frequency amplification circuit capable of detecting a field strength with low electric power |
| 07/27/1989 | WO1989006877A1 Noise reduction |
| 07/25/1989 | US4852167 FMX stereophonic receiver |
| 06/06/1989 | CA1255379A1 Device for increasing the dynamic range of an amplification circuit in particular of an airborne mls receiver |
| 05/18/1989 | WO1989004583A1 Adaptive, programmable signal processing hearing aid |
| 05/09/1989 | US4829270 Compansion system |
| 04/27/1989 | DE3733739C1 Anordnung zur A/D-Wandlung mit A/D-Wandler Arrangement for A / D conversion with A / D converter |
| 04/26/1989 | EP0312569A1 Method and apparatus for improving voice intelligibility in high noise environments. |
| 04/18/1989 | US4823392 Controlling the dynamic range of audio signals |
| 04/12/1989 | EP0311477A1 Method for expanding an analogous signal and device for carrying out the method |
| 04/12/1989 | EP0310769A2 Method and device for processing (dynamically) compressed analog ton signal (ton) signals recorded on memory support and sampled therefrom |
| 03/22/1989 | EP0307465A1 Semiconductor emulation of tube amplifiers. |
| 03/01/1989 | EP0305301A1 Signal compressor circuit, in particular for telephone set |
| 02/28/1989 | US4809336 Distortion synthesizer |
| 02/28/1989 | US4809274 System for processing audio signals |
| 01/31/1989 | US4802222 Data compression system and method for audio signals |
| 01/31/1989 | US4801890 Circuit arrangements for modifying dynamic range using variable combining techniques |
| 01/04/1989 | EP0297461A2 Amplitude compressing/Expanding circuit |
| 12/28/1988 | EP0296683A2 Method and circuit for reducing interference |
| 12/27/1988 | US4794342 Intermediate frequency amplification circuit capable of detecting a field strength with low electric power |
| 12/20/1988 | US4792977 Hearing aid circuit |
| 12/13/1988 | US4791385 Voltage controlled amplifier for symmetrical electrical signals |
| 11/23/1988 | CN88100369A Fmx stereophonic receiver |
| 11/22/1988 | US4786879 Attenuator circuit employing bootstrapping |
| 11/15/1988 | US4785418 In a signal processor |
| 11/15/1988 | US4785256 For the amplification of electrical input signals |