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)
11/1989
11/29/1989EP0343691A2 An apparatus for changing a sound field
11/14/1989US4881043 Variable gain transconductance amplifier and variable bandwidth filter
11/14/1989US4879937 Sound effector
11/07/1989US4879749 Host controller for programmable digital hearing aid system
10/1989
10/24/1989US4876499 Differental voltage controlled exponential current source
10/17/1989US4875020 Analog integrated circuit having intrinsic topologies and characteristics selectable by a digital control
10/10/1989US4873722 Multi-channel reproducing system
09/1989
09/26/1989US4870690 Audio signal transmission system
09/21/1989WO1989008970A1 Induction loop driving amplifiers
09/21/1989DE3807404A1 Program memory chip
09/19/1989US4868881 Method and system of background noise suppression in an audio circuit particularly for car radios
09/19/1989US4868878 Sound field correction system
09/19/1989US4868516 Alternating current amplifier with digitally controlled frequency response
09/13/1989EP0332079A2 Adaptive equalizer system
09/12/1989US4866779 Adaptive AM audio processor
09/06/1989EP0330908A2 Car radio with a traffic broadcast decoder
09/05/1989US4864625 Effector for electronic musical instrument
08/1989
08/30/1989EP0330062A1 Radio receiver for a vehicle
08/24/1989WO1989007860A1 Radio receiver for vehicles
08/23/1989EP0329201A2 Mobile sound field correcting device
08/01/1989US4853609 Distortion-free, opposite-phase current source
07/1989
07/25/1989US4852176 Continuous differential signal equalizer
07/25/1989CA1257930A1 A-d encoder and d-a decoder system
07/18/1989US4849826 Digital non-linear pre-emphasis/de-emphasis apparatus for eliminating noise components from video signals in a video signal processing system
07/18/1989US4849709 Variable frequency characteristic circuit for a vehicular sound device
07/04/1989US4845775 Loudspeaker reproduction apparatus in vehicle
07/04/1989US4845758 Equalizer with adjustable band filters and a digital filter suitable for use in the equalizer
06/1989
06/28/1989EP0322382A2 Analog integrated circuit having intrinsic topologies and characteristics selectable by a digital control
06/20/1989US4841461 Filter adjustment apparatus and method
06/20/1989US4841179 Phase equalizing active filter
06/13/1989US4839610 System for automatically controlling the gain-bandwidth product of operational amplifiers
05/1989
05/30/1989US4835490 Circuit for automatically controlling the gain-bandwidth product of operational amplifiers
05/09/1989US4829270 Compansion system
04/1989
04/25/1989US4825173 High gain, programmable differential amplifier circuitry
04/19/1989EP0312137A2 Bandfilter
04/18/1989US4823391 Sound reproduction system
03/1989
03/29/1989EP0191784B1 Optical receiver circuit
03/22/1989EP0308009A1 Method of and arrangement for adjusting the transfer characteristic to two listening positions in a space
03/22/1989EP0307725A2 Noise-compensation circuit
03/22/1989EP0307465A1 Semiconductor emulation of tube amplifiers.
03/14/1989US4812773 Filter adjustment apparatus and method
02/1989
02/28/1989US4809338 Automotive sound system
02/28/1989US4809337 Audio noise gate
02/28/1989US4809336 Distortion synthesizer
01/1989
01/10/1989US4797633 Audio amplifier
12/1988
12/21/1988EP0295934A2 Superdistorted amplifier circuitry with normal gain
12/20/1988US4792977 Hearing aid circuit
12/06/1988US4790014 Low-pitched sound creator
12/06/1988US4789952 Method and apparatus for digital compensation and digital equalization
11/1988
11/15/1988US4785475 Apparatus and method for equalizing a soundfield
11/08/1988US4783819 Automatically controlled amplifier arrangement
11/08/1988US4783756 Sampled data tone control system
10/1988
10/26/1988EP0288159A2 Digital equalizer apparatus enabling separate phase and amplitude characteristic modification
10/19/1988EP0287063A2 Circuit for automatically controlling the gain-bandwidth product of operational amplifiers
10/19/1988EP0287057A2 Automatic loudness control circuit
10/06/1988WO1988007787A1 Semiconductor emulation of tube amplifiers
09/1988
09/15/1988DE3706928A1 Method for influencing predetermined frequency channels within a frequency range and graphic equaliser for carrying out the method
08/1988
08/16/1988US4764967 Tone control system for sampled data signals
08/16/1988US4764957 Earpiece, telephone handset and headphone intended to correct individual hearing deficiencies
08/09/1988US4763012 Equalizer quick switch
08/02/1988US4761829 Adaptive signal strength and/or ambient noise driven audio shaping system
08/02/1988CA1239876A1 Variable emphasis circuit
07/1988
07/26/1988US4760602 Variable preemphasis/deemphasis network
07/19/1988US4759065 Automotive sound system
07/06/1988EP0273581A2 A method and apparatus for digital compensation and digital equalization
07/06/1988EP0273365A2 Filter adjustment apparatus and method
07/06/1988EP0273303A2 Filter adjustment apparatus and method
07/05/1988US4755771 Equalizing circuit
06/1988
06/29/1988EP0272702A2 System for automatically controlling the gain-bandwidth product of operational amplifiers
06/14/1988US4751739 Apparatus and method for controlling tone quality
06/09/1988DE3740358A1 Loudspeaker volume control circuit
06/07/1988US4750207 Hearing aid noise suppression system
05/1988
05/31/1988US4748669 Stereo enhancement system
05/18/1988EP0267785A2 Digital non-linear pre-emphasis/de-emphasis apparatus
05/10/1988CA1236405A1 Spectral emphasis and de-emphasis
05/04/1988EP0266148A2 A tone control system for sampled data signals
04/1988
04/21/1988DE3626437A1 Transcription tone controller
04/19/1988US4739514 Automatic dynamic equalizing
04/19/1988US4739513 Method and apparatus for measuring and correcting acoustic characteristic in sound field
04/06/1988EP0262160A1 Stereo enhancement system.
04/05/1988US4736426 Graphic balancer
03/1988
03/30/1988EP0261848A2 A sampled data tone control system
03/15/1988US4731852 Method to electronically clarify sound or picture information and an arrangement to carry out the method
03/15/1988US4731850 Programmable digital hearing aid system
03/15/1988US4731835 Reverberation tone generating apparatus
01/1988
01/27/1988EP0253902A1 Noise reduction apparatus and method
01/26/1988CA1232037A1 Filter arrangement
01/07/1988EP0250679A2 Programmable sound reproducing system
12/1987
12/29/1987US4716321 Low noise, high thermal stability attenuator of the integratable type
12/29/1987CA1230828A1 Digital graphic equalizer
12/01/1987US4710962 Signal control apparatus
11/1987
11/17/1987CA1229309A1 Filter system
11/10/1987US4706291 Reverberation imparting device
11/03/1987US4704586 Bipolar bandwidth switch for use in a phase-locked loop
10/1987
10/28/1987EP0242444A2 Mobile radio receiver
10/14/1987EP0240798A1 Hearing aid noise suppression system
10/13/1987US4700362 A-D encoder and D-A decoder system
10/13/1987US4700361 Spectral emphasis and de-emphasis
10/08/1987WO1987006090A1 Stereo enhancement system
10/07/1987EP0240286A2 Low-pitched sound creator
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