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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
4908858 Stereo processing system Mar. 13, 1990
4887045 Sum/differential signal processing circuit Dec. 12, 1989
4876719 Synchronizing system for digital apparatus Oct. 24, 1989
4868878 Sound field correction system Sep. 19, 1989
4866774 Stero enhancement and directivity servo Sep. 12, 1989
4856064 Sound field control apparatus Aug. 8, 1989
4841572 Stereo synthesizer Jun. 20, 1989
4837824 Stereophonic image widening circuit Jun. 6, 1989
4831652 Stereo expansion circuit selection switch May. 16, 1989
4817149 Three-dimensional auditory display apparatus and method utilizing enhanced bionic emulation of human binaural sound localization Mar. 28, 1989
4817162 Binaural correlation coefficient correcting apparatus Mar. 28, 1989
4815133 Sound field producing apparatus Mar. 21, 1989
4815132 Stereophonic voice signal transmission system Mar. 21, 1989
4815131 Digital audio channel selection circuit Mar. 21, 1989
4807217 Multi-channel stereo reproducing apparatus Feb. 21, 1989
4803727 Transmission system Feb. 7, 1989
4792974 Automated stereo synthesizer for audiovisual programs Dec. 20, 1988
4790014 Low-pitched sound creator Dec. 6, 1988
4782530 Non-recursive system for expanding the stereo base of stereophonic acoustic diffusion apparatus Nov. 1, 1988
4748669 Stereo enhancement system May. 31, 1988
4736426 Graphic balancer Apr. 5, 1988
4700389 Stereo sound field enlarging circuit Oct. 13, 1987
4698842 Audio processing system for restoring bass frequencies Oct. 6, 1987
4696035 System for expanding the stereo base of stereophonic acoustic diffusion apparatus Sep. 22, 1987
4648113 Method and apparatus for providing a visual indication of a relationship between two signals Mar. 3, 1987
4646150 Apparatus and method for stereo television sound Feb. 24, 1987
4642812 Sound field enlarging device and method Feb. 10, 1987
4635288 Electrical signal mixing apparatus Jan. 6, 1987
4630298 Method and apparatus for reproducing sound having a realistic ambient field and acoustic image Dec. 16, 1986
4622878 Stereophonic system for electronic organs Nov. 18, 1986
4612663 Multichannel audio reproduction system Sep. 16, 1986
4611226 Television receiver incorporating a processing section for processing stereo/multichannel-sound signals Sep. 9, 1986
4608456 Digital audio scrambling system with error conditioning Aug. 26, 1986
4603429 Dimensional sound recording and apparatus and method for producing the same Jul. 29, 1986
4586192 Soundstage boundary expansion system Apr. 29, 1986
4577540 Electronic musical instrument having a pan-pot function Mar. 25, 1986
4569074 Method and apparatus for reproducing sound having a realistic ambient field and acoustic image Feb. 4, 1986
4567607 Stereo image recovery Jan. 28, 1986
4524451 Sound reproduction system having sonic image localization networks Jun. 18, 1985
4503554 Stereophonic balance control system Mar. 5, 1985
4496979 FM High-fidelity processor Jan. 29, 1985
4495637 Apparatus and method for enhanced psychoacoustic imagery using asymmetric cross-channel feed Jan. 22, 1985
4489432 Method and apparatus for reproducing sound having a realistic ambient field and acoustic image Dec. 18, 1984
4433209 Stereo/monaural selecting circuit Feb. 21, 1984
4421488 Aid for curing or mitigating stammering Dec. 20, 1983
4415768 Tuning apparatus and method Nov. 15, 1983
4410761 Stereo loudspeaker system for a picture reproducing screen Oct. 18, 1983
4404429 Matching volume control characteristics for two channels Sep. 13, 1983
4399328 Direction and frequency independent column of electro-acoustic transducers Aug. 16, 1983
4394537 Sound reproduction device Jul. 19, 1983

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










 
 
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