Patents
Sitemap › H04 - Electric communication technique › H04S - Stereophonic systems › H04S 1 - Two-channel systems
Patents for H04S 1 - Two-channel systems (4,182)
08/1983
08/16/1983US4399328 Direction and frequency independent column of electro-acoustic transducers
07/1983
07/19/1983US4394537 Sound reproduction device
07/19/1983US4394536 Sound reproduction device
06/1983
06/29/1983EP0082205A1 Television voice multiplex signal reproducing circuit
06/14/1983US4388654 Video disc player with selectively enabled audio signal expander circuitry
06/14/1983US4388494 Process and apparatus for improved dummy head stereophonic reproduction
05/1983
05/31/1983CA1147228A1 Surgical suturing instrument for application of a staple suture
02/1983
02/01/1983CA1140641A1 Noise reducing circuit for ctd delay line
12/1982
12/23/1982WO1982004517A1 Television voice multiplex signal reproducing circuit
10/1982
10/26/1982US4356349 Acoustic image enhancing method and apparatus
10/19/1982US4355203 Stereo image separation and perimeter enhancement
09/1982
09/14/1982US4349698 Audio signal translation with no delay elements
05/1982
05/26/1982EP0052144A1 Diotic position recovery circuits
05/11/1982US4329544 Sound reproduction system for motor vehicle
04/1982
04/27/1982CA1122658A2 Compatible am stereo broadcast system
04/21/1982EP0050100A2 Device for the spatial codification of sounds
03/1982
03/02/1982US4317958 Noise reducing circuit for CTD delay line
01/1982
01/05/1982US4309570 Dimensional sound recording and apparatus and method for producing the same
12/1981
12/29/1981US4308423 Stereo image separation and perimeter enhancement
12/02/1981EP0040739A1 Arrangement for reproduction of a sound recording by headphones
11/1981
11/26/1981WO1981003407A1 Dichotic position recovery circuits
11/24/1981US4302837 FM Multiplex system for selectively delaying one of two audio signals
10/1981
10/13/1981CA1110720A1 Fm multiplex system for selectively delaying one of two audio signals
09/1981
09/08/1981US4288752 Stereo demodulator with high frequency de-emphasis compensation
09/02/1981EP0034844A1 A direction- and frequency-independent loudspeaker- or microphone-column or a loudspeaker- or microphone-surface
08/1981
08/27/1981EP0026224A4 Dimensional sound producing apparatus and a sound recording.
05/1981
05/26/1981CA1102000A1 Detection and monitoring device
04/1981
04/08/1981EP0026224A1 Dimensional sound producing apparatus and a sound recording
03/1981
03/25/1981EP0025509A1 Process for stereophonic transmission and means for carrying out the method
12/1980
12/16/1980US4239937 Stereo separation control
12/02/1980US4237343 Digital delay/ambience processor
10/1980
10/16/1980WO1980002219A1 Dimensional sound producing apparatus and method
10/07/1980US4227221 PCM Recording apparatus
08/1980
08/26/1980US4219696 Sound image localization control system
08/19/1980US4218585 Dimensional sound producing apparatus and method
06/1980
06/24/1980US4209665 Audio signal translation for loudspeaker and headphone sound reproduction
06/17/1980US4208547 Method and apparatus for reducing noise in stereophonic signals
06/17/1980US4208546 Phase stereophonic system
05/1980
05/20/1980US4204092 Audio image recovery system
04/1980
04/22/1980US4199658 Binaural sound reproduction system
04/01/1980US4196313 Polyphonic sound system
03/1980
03/11/1980US4192969 Stage-expanded stereophonic sound reproduction
03/04/1980US4191852 Stereophonic sense enhancing apparatus
02/1980
02/12/1980US4188504 Signal processing circuit for binaural signals
01/1980
01/08/1980US4182930 Detection and monitoring device
12/1979
12/25/1979CA1068612A Headphone circuit simulating reverberation signals
10/1979
10/16/1979CA1064400A1 Headphone apparatus with reverberation circuits
09/1979
09/11/1979US4167651 Mixing two signals derived from an audio source without oscillation
08/1979
08/14/1979US4164625 A/C Circuit for combining an automobile radio speaker with speakers of an automobile stereophonic system
07/1979
07/24/1979US4162457 Expansion circuit for improved stereo and apparent monaural image
06/1979
06/26/1979US4159397 Acoustic translation of quadraphonic signals for two- and four-speaker sound reproduction
03/1979
03/27/1979CA1051350A1 Headphone system
03/20/1979CA1050898A1 Stereophonic sound reproduction system
03/06/1979US4143244 Binaural sound reproducing system
02/1979
02/13/1979US4139728 Signal processing circuit
01/1979
01/23/1979US4136260 Out-of-head localized sound reproduction system for headphone
12/1978
12/19/1978CA1044764A1 Audio processor circuit for an fm-stereo radio receiver
10/1978
10/17/1978US4121059 Sound field expanding device
10/03/1978US4118599 Stereophonic sound reproduction system
08/1978
08/15/1978US4107463 Stereophonic noise suppression system
08/15/1978CA1036503A1 Special effects generation and control system for motion pictures
08/08/1978US4105865 Audio distributor
08/08/1978US4105864 Stereo and spaciousness reverberation system using random access memory and multiplex
06/1978
06/27/1978US4097689 Out-of-head localization headphone listening device
05/1978
05/16/1978US4090148 Circuit pattern for a protection circuit of a stereo amplifier
05/02/1978US4087631 Projected sound localization headphone apparatus
03/1978
03/14/1978US4079333 Audio amplifier
01/1978
01/17/1978US4069394 Stereophonic sound reproduction system
01/10/1978US4068093 Device for transmitting audio-frequency signals
11/1977
11/15/1977US4058675 Loudspeaker system for use in a stereophonic sound reproduction system
11/1976
11/16/1976US3992582 Reverberation sound producing apparatus
11/02/1976US3989897 Method and apparatus for reducing noise content in audio signals
08/1976
08/10/1976US3973839 Special effects generation and control system for motion pictures
07/1976
07/20/1976US3970787 Auditorium simulator and the like employing different pinna filters for headphone listening
06/1976
06/08/1976US3962543 Method and arrangement for controlling acoustical output of earphones in response to rotation of listener's head
05/1976
05/11/1976US3956709 Balance control system for multichannel audio apparatus
04/1976
04/20/1976US3952161 Audio processor circuit for an FM-stereo radio receiver
03/1976
03/16/1976US3944748 Means and method of reducing interference in multi-channel reproduction of sounds
03/09/1976US3943293 Stereo sound reproducing apparatus with noise reduction
03/02/1976US3941931 Audio signal mixing system
02/1976
02/17/1976US3939489 Recording and reproducing apparatus
01/1976
01/13/1976US3932039 Pulsed polarization device for measuring angle of rotation
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