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Class Information
Number: 381/1
Name: Electrical audio signal processing systems and devices > Binaural and stereophonic
Description: Subject matter where there are two or more independent sound signals which are to be separately reproduced so as to create a sense of depth.










Sub-classes under this class:

Class Number Class Name Patents
381/28 Amplifier 141
381/2 Broadcast or multiplex stereo 308
381/27 Center channel 156
381/23.1 Hearing aid 145
381/17 Pseudo stereophonic 792
381/19 Quadrasonic 202
381/26 Stereo sound pickup device (microphone) 161
381/300 Stereo speaker arrangement 299


Patents under this class:
1 2 3 4 5 6 7 8 9 10 11 12

Patent Number Title Of Patent Date Issued
4394536 Sound reproduction device Jul. 19, 1983
4388494 Process and apparatus for improved dummy head stereophonic reproduction Jun. 14, 1983
4359601 Audio control system Nov. 16, 1982
4356349 Acoustic image enhancing method and apparatus Oct. 26, 1982
4355203 Stereo image separation and perimeter enhancement Oct. 19, 1982
4352953 Multichannel non-discrete audio reproduction system Oct. 5, 1982
4349698 Audio signal translation with no delay elements Sep. 14, 1982
4329544 Sound reproduction system for motor vehicle May. 11, 1982
4309570 Dimensional sound recording and apparatus and method for producing the same Jan. 5, 1982
4308423 Stereo image separation and perimeter enhancement Dec. 29, 1981
4292467 Control for audio receiver Sep. 29, 1981
4219696 Sound image localization control system Aug. 26, 1980
4218585 Dimensional sound producing apparatus and method Aug. 19, 1980
4208546 Phase stereophonic system Jun. 17, 1980
4192969 Stage-expanded stereophonic sound reproduction Mar. 11, 1980
4191852 Stereophonic sense enhancing apparatus Mar. 4, 1980
4149036 Crosstalk compensating circuit Apr. 10, 1979
4139728 Signal processing circuit Feb. 13, 1979
4135203 Method and apparatus for generating complex visual patterns Jan. 16, 1979
4121059 Sound field expanding device Oct. 17, 1978
4118599 Stereophonic sound reproduction system Oct. 3, 1978
4100372 Audio console system for home and vehicle Jul. 11, 1978
4096360 Multichannel record disc reproducing system Jun. 20, 1978
4076959 Volume, tone and balance control for multi-channel audio systems Feb. 28, 1978
4069394 Stereophonic sound reproduction system Jan. 17, 1978
4048442 Stereophonic sound adaptor for simulating sound movement Sep. 13, 1977
4028491 Transducer switching system Jun. 7, 1977
3983334 Matrix and equalizer circuit with gain control Sep. 28, 1976
3944748 Means and method of reducing interference in multi-channel reproduction of sounds Mar. 16, 1976
3941931 Audio signal mixing system Mar. 2, 1976
3940789 Multicolor display for the visual-aesthetic portrayal of electric signals Feb. 24, 1976

1 2 3 4 5 6 7 8 9 10 11 12










 
 
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