Patents
Sitemap › H03 - Basic electronic circuitry › H03G - Control of amplification › H03G 5 - Tone control or bandwidth control in amplifiers
Patents for H03G 5 - Tone control or bandwidth control in amplifiers (3,156)
06/1999
06/17/1999WO1999030414A1 Apparatus and methods for enhancing electronic audio signals
06/17/1999CA2313695A1 Apparatus and methods for enhancing electronic audio signals
06/08/1999US5910990 Apparatus and method for automatic equalization of personal multi-channel audio system
06/08/1999US5910904 Digital filter apparatus
06/02/1999EP0920127A2 Speech band division decoder
05/1999
05/27/1999WO1999026337A2 Methods and apparatus for automatically synchronizing and regulating volume in audio component systems
05/26/1999EP0788722B1 Apparatus and method of enhancing audio signals
05/20/1999WO1999025151A1 Audio system comprising audio signal processing circuit
05/20/1999WO1999025150A1 Audio system comprising audio signal processing circuit
05/19/1999EP0916218A1 Method and apparatus for applying a user selected frequency response pattern to audio signals provided to a cellular telephone speaker
05/19/1999CN1217100A Dual-mode radio receiver for receiving narrowband and wide band signals
05/04/1999US5901005 Magnetic recording and reproducing apparatus having a drum preamplifier with improved S/N and dynamic range
04/1999
04/29/1999WO1998045955A3 Serial digital data communications receiver with automatic cable equalizer, agc system, and dc restorer
04/28/1999CN1215251A 信号电平调整回路 Signal level adjustment circuit
04/20/1999US5896449 Voice enhancement system and method
04/06/1999US5892832 Method for controlling the sound of audio signals within a frequency range
03/1999
03/24/1999CN1212100A Voice enhancement system and method
03/09/1999US5881157 Apparatus for compensating a frequency characteristic of a reproduction audio signal
03/09/1999US5881103 Electronic device with equalized audio accessory and method for same
02/1999
02/24/1999EP0898364A2 Compensating filters
02/23/1999CA2160960C Method and device for controlling output power of a power amplifier
02/18/1999WO1999008380A1 Improved listening enhancement system and method
02/03/1999CN1206985A Method and device for automatic compensating sound volume
02/03/1999CN1206984A Method and device for automatic compensating tone
01/1999
01/27/1999CN1206516A Acoustic signal waveform intensifier and intensifying method
01/21/1999WO1999003199A1 Voice signal processor
01/07/1999DE19825779A1 Automatic compensation of tone in audio signal processing
12/1998
12/30/1998EP0887944A2 Digital processing radio receiver
12/29/1998US5854847 Speaker system for use in an automobile vehicle
12/23/1998EP0885484A1 Fat sound creation means
12/16/1998EP0884839A2 Method and apparatus for automatically compensating sound volume
12/16/1998EP0883934A1 Dual-mode radio receiver for receiving narrowband and wide band signals
12/03/1998DE19722702A1 Digital signal processing circuit for D=A conversion of audio signal
11/1998
11/25/1998CN1199986A Frequency compensated pin diode attenuator
11/10/1998US5834988 Frequency compensated PIN diode attenuator
11/10/1998US5834969 Circuit for processing signals from a magneto-resistive head
11/03/1998US5832438 Apparatus and method for audio computing
10/1998
10/20/1998US5825899 Audio data processing apparatus
10/20/1998US5825826 Method and apparatus for frequency domain ripple compensation for a communications transmitter
10/15/1998WO1998045955A2 Serial digital data communications receiver with automatic cable equalizer, agc system, and dc restorer
10/15/1998WO1998045940A1 Automatic volume control in an audio-signal reproduction facility, and device required
10/14/1998EP0871287A1 Acoustic signal waveform intensifier and intensifying method
10/14/1998EP0870391A2 Voice enhancement system and method
10/08/1998DE19713862A1 Verfahren zur automatischen Lautstärkesteuerung in einer Audiosignal-Wiedergabevorrichtung und Anordnung dazu Method for automatic volume control in an audio signal reproducing apparatus and arrangement to
10/04/1998CA2201834A1 Serial digital data communications receiver with improved automatic cable equalizer, agc system, and dc restorer
09/1998
09/29/1998US5815580 Compensating filters
09/29/1998US5814752 Musical instrument crossover circuits and method of using same
09/22/1998US5812687 Circuit for controlling the frequency and/or phase response of a signal amplification system
09/22/1998US5812030 Amplifier device capable of carrying out a stable amplifying operation without a gain variation
09/22/1998US5812009 Boost type equalizing circuit
09/17/1998DE19810620A1 Wideband damping unit for converting band of high frequency signals
09/08/1998US5805716 For processing a received audio signal
09/08/1998US5805006 Controllable integrator
09/01/1998US5802186 Audio signal processing apparatus
07/1998
07/28/1998US5787182 Audio signal amplifier circuit and a portable audio equipment using the same
06/1998
06/30/1998US5774085 Apparatus and method for obtaining proper output signal in which gain and DC component are regulated based upon on measured amplitude distribution
06/23/1998US5771296 Audio circuit
06/23/1998CA2089617C Control circuit for automatically controlled feed forward nonlinear distortion compensation amplifier
06/16/1998US5768694 Automatic gain control circuit with input and output signal detectors operating in equalized conditions
06/16/1998US5768398 Signal amplification system with automatic equalizer
06/16/1998CA2085415C Amplifier biasing circuit
06/11/1998WO1998025340A1 Automatic dynamic range controlling circuit
06/02/1998US5761321 Volume controller
06/02/1998US5761316 Variable and reactive audio power amplifier
05/1998
05/28/1998DE19720217A1 Automatic equalising arrangement for multi-channel audio system
05/20/1998EP0842562A1 Automatically switched equalization circuit
05/20/1998CN1182270A Apparatus for compensating frequency characteristic of reproduction audio signal
05/19/1998US5754668 Equalizer and audio device using the same
05/13/1998CN1181660A Sound quality adjustment circuit
05/05/1998US5748754 Sound system gain and equalization circuit
05/05/1998US5748747 Digital signal processor for adding harmonic content to digital audio signal
04/1998
04/30/1998WO1998018203A1 Acoustic signal waveform intensifier and intensifying method
04/28/1998US5745856 Radio receiver for demodulating both wideband and narrowband modulated signals
04/28/1998US5745586 Sound quality control system
04/28/1998US5745585 Dynamic equalization method and device
04/28/1998US5745583 Audio playback system
04/22/1998CN1179862A Audio bass speaker driver circuit
04/07/1998US5736897 Low input signal bandwidth compressor and amplifier control circuit with a state variable pre-amplifier
04/02/1998DE19734969A1 Device for reproducing audio signals
04/01/1998EP0833460A2 Method and apparatus for frequency domain ripple compensation for a communications transmitter
04/01/1998EP0833444A2 Method and device for reproducing audio
04/01/1998CN1177878A Telephone set with hearing-aid device
03/1998
03/31/1998US5734730 Apparatus for adjusting a frequency characteristic of an audio signal according to biorhythm principles
03/31/1998US5734287 Control of distortion in a line-powered amplifier with a rail-to-rail output voltage swing
03/24/1998US5732142 Musical sound reproduction controller with two-stage adjustment of tone
03/17/1998US5729828 Frequency processing circuit with lower sideband suppression and emphasis
03/10/1998US5727074 Method and apparatus for digital filtering of audio signals
03/10/1998US5727066 Sound Reproduction systems
03/10/1998US5726606 Electronic circuit
03/10/1998US5726604 Differential transconductor stage dynamically controlled by the input signal's amplitude
03/05/1998DE19633676A1 Car radio receiver with audio frequency response adjustment
03/04/1998EP0827314A2 A telephone apparatus with hearing assistance
03/03/1998US5724006 Circuit arrangement with controllable transmission characteristics
02/1998
02/24/1998US5722062 Linear receiver having dual automatic gain control loops
02/19/1998WO1998007234A1 Apparatus and methods for the harmonic enhancement of electronic audio signals
02/19/1998CA2262736A1 Apparatus and methods for the harmonic enhancement of electronic audio signals
02/10/1998US5717773 Sound system gain and equalization circuit
02/10/1998US5717763 Vocal mix circuit
02/05/1998WO1998005150A1 Method and apparatus for applying a user selected frequency response pattern to audio signals provided to a cellular telephone speaker
02/05/1998CA2261727A1 Method and apparatus for applying a user selected frequency response pattern to audio signals provided to a cellular telephone speaker
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