Patents
Sitemap › H03 - Basic electronic circuitry › H03G - Control of amplification › H03G 7 - Volume compression or expansion in amplifiers
Patents for H03G 7 - Volume compression or expansion in amplifiers (2,243)
12/1998
12/08/1998US5848165 Fat sound creation means
11/1998
11/25/1998EP0879483A1 Temperature compensated logarithmic detector
11/24/1998US5841875 Digital audio signal processor with harmonics modification
11/24/1998CA2139717C Multi-stage solid state amplifier that emulates tube distortion
11/17/1998US5838807 Trimmable variable compression amplifier for hearing aid
11/17/1998US5838194 Constant settling time automatic gain control circuits
11/12/1998DE19719548A1 Radio signal processing method
10/1998
10/28/1998EP0873589A1 Methods and apparatus for signal amplitude control systems
10/27/1998US5828328 Of a signal processing device
10/22/1998WO1998047315A1 Method and apparatus for noise reduction, particularly in hearing aids
10/22/1998WO1998047224A1 Audio dynamic range processor with adjustable crest factor sensitivity
10/22/1998WO1998047223A1 Audio dynamic range processor with adjustable signal observation window
10/13/1998US5822442 Gain compression amplfier providing a linear compression function
10/13/1998US5821814 Negative feedback amplifier
10/13/1998US5821810 Method and apparatus for trim adjustment of variable gain amplifier
10/06/1998US5818279 Circuit arrangement comprising a logarithmic transfer function
09/1998
09/30/1998EP0867067A1 Amplifier having linear-in-db gain control
09/29/1998US5815532 Method and apparatus for peak-to-average ratio control in an amplitude modulation paging transmitter
09/29/1998US5815011 Circuit for adjusting the coring threshold of a signal
09/22/1998US5812218 Device for the generation of transfer functions defined by intervals
09/22/1998US5812008 Logarithmic converter
09/22/1998CA2100154C Switched signal processing circuit
09/15/1998US5808511 Active feedback pre-distortion linearization
09/08/1998US5805713 Solid state circuit for emulating push-pull tube amplifier
09/08/1998US5805011 Self-calibration system for logarithmic amplifiers
09/02/1998EP0591441B1 An improved multiband programmable compression system
09/01/1998US5801587 Variable gain peak detector
08/1998
08/19/1998EP0581835B1 Circuit for controllable amplifier
08/18/1998US5796309 Temperature compensated wide dynamic range power detection circuitry for portable RF transmission terminals
08/11/1998US5793315 Bit-serial digital expandor
08/06/1998WO1998034342A1 Low power, high linearity log-linear control method and apparatus
08/05/1998EP0856209A1 Trimmable variable compression amplifier for hearing aid
08/05/1998CN1189933A Circuit arrangement comprising a lograrithmic transfer function
08/04/1998US5790943 Dynamic range extension of a log amplifier with temperature and process compensation
08/04/1998US5789689 Tube modeling programmable digital guitar amplification system
07/1998
07/30/1998DE19703228A1 Input signal amplification method for hearing aid
07/29/1998EP0855793A2 Method of controlling dynamic range of digital audio broadcasting receiver
07/29/1998CN1189046A Apparatus and method for controlling sound for audio/video appliance
07/22/1998EP0853778A1 Analogue function network for selecting a characteristic curve
07/21/1998US5784476 Audio signal reproduction apparatus
07/14/1998US5781848 Mobile telephone device wherein a compressor circuit performs amplitude compression such that a less variable gain is given to an audio signal having a lower level range than an audio signal having a higher level range
07/08/1998EP0852427A2 Self-calibration system for logarithmic amplifiers
06/1998
06/23/1998US5771301 Sound leveling system using output slope control
06/23/1998US5771182 Bit-serial digital compressor
06/16/1998US5767741 Self compensating differential circuit
06/11/1998WO1998025340A1 Automatic dynamic range controlling circuit
06/10/1998EP0846369A1 Variable-gain amplifier with pseudo-logarithmic gain control
06/02/1998US5761321 Volume controller
06/02/1998US5761317 Tube amplifier fat emulation structure
06/02/1998US5761316 Variable and reactive audio power amplifier
05/1998
05/27/1998EP0844805A1 A compression amplifier
05/26/1998US5757938 High efficiency encoding device and a noise spectrum modifying device and method
05/26/1998US5757230 Variable gain CMOS amplifier
05/06/1998EP0839407A1 A high frequency, differential limiting distributed amplifier
05/05/1998US5748786 Apparatus for compression using reversible embedded wavelets
05/05/1998US5748041 AGC amplifier circuit using triple-tail cell
05/05/1998US5748027 Low power, high linearity log-linear control method and apparatus
04/1998
04/15/1998EP0716783B1 Amplifier stage with a db-linear output voltage
04/15/1998EP0651906B1 Semiconductor-emulation of vacuum tubes
04/15/1998CN1179242A Filter with feed-forward AGC
04/07/1998US5737718 Method, apparatus and recording medium for a coder with a spectral-shape-adaptive subband configuration
04/07/1998US5737434 Multi-band audio compressor with look-ahead clipper
04/07/1998US5737033 AGC apparatus concurrently satisfying sufficient impedance matching characteristic and linear AGC characteristic
04/07/1998US5736898 Process and device for linearizing the gain charactristics and phase-frequency characteristics of traveling-wave tubes and transistor amplifiers at different power levels
04/07/1998US5736897 Low input signal bandwidth compressor and amplifier control circuit with a state variable pre-amplifier
04/07/1998CA2139714C Solid state tube compression circuit
03/1998
03/31/1998US5734725 Tube emulator amplifier system
03/25/1998EP0830731A1 Signal conditioning circuit for compressing audio signals
03/24/1998US5731695 Voltage limiter circuit
03/10/1998US5727069 Solid state musical instrument amplifier with vacuum tube signal magnitude limiting
03/05/1998WO1998009375A1 Multi-band audio compressor with look-ahead clipper
03/04/1998CN1175135A Bit serial digital expander
03/03/1998US5724003 Methods and apparatus for signal amplitude control systems
02/1998
02/25/1998EP0824787A2 Circuit arrangement comprising a logarithmic transfer function
02/12/1998DE19631892A1 Vacuum tube amplifier audio signal generation circuit
02/11/1998EP0823778A1 Active feedback pre-distortion linearization
02/04/1998CN1172384A Temperature compensated wide dynamic range power detection circuitry for portable RF transmission terminals
01/1998
01/13/1998US5708722 Microphone expansion for background noise reduction
01/08/1998DE19710474A1 Temperature compensated logarithmic amplifier for mobile telephone
01/07/1998EP0817374A2 Audio system
01/07/1998EP0817373A2 Negative feedback amplifier
01/06/1998US5706356 Audio processor
12/1997
12/31/1997CN1169215A Intermediate frequency amplifier and method for producing received signal strength indicator signal
12/30/1997US5703535 Circuit arrangement for amplitude-dependent attenuation of a television signal
12/29/1997EP0530342B1 Dynamic range compression
12/24/1997WO1997049178A1 Variable-gain amplifier with pseudo-logarithmic gain control
12/23/1997US5701353 Audio signal processing circuit for compressing or expanding audio signal in which output DC voltage is controlled in response to reference voltage
12/23/1997US5701352 Tone suppression automatic gain control for a headset
12/17/1997EP0813297A1 Amplifier with digital gain control and camera using the same
12/16/1997US5699004 Temperature compensation of logarithmic amplifiers in a sampled data system
12/10/1997CN1167535A Temperature compensated logarithmic convertor
12/04/1997WO1997045954A1 Variable gain cmos amplifier
12/02/1997CA2076711C Power controller
11/1997
11/26/1997CN1166247A Improvements to a logarithmic converter
11/25/1997US5692105 In a digital mobile radio system
11/19/1997EP0807332A1 Filter with feed-forward agc
11/13/1997DE19624092A1 Amplification circuit e.g. for analogue or digital hearing aid
11/12/1997CN1164728A Compressed audio signal processing
11/06/1997WO1997041548A1 Method and apparatus for peak-to-average ratio control in an amplitude modulation paging transmitter
11/04/1997US5684431 Differential-input single-supply variable gain amplifier having linear-in-dB gain control
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