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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
5727066 Sound Reproduction systems Mar. 10, 1998
5724429 System and method for enhancing the spatial effect of sound produced by a sound system Mar. 3, 1998
5717765 Theater sound system with upper surround channels Feb. 10, 1998
5717763 Vocal mix circuit Feb. 10, 1998
5710818 Apparatus for expanding and controlling sound fields Jan. 20, 1998
5708718 Surround sound processor system Jan. 13, 1998
5703999 Process for reducing data in the transmission and/or storage of digital signals from several interdependent channels Dec. 30, 1997
5703955 Method and apparatus for multichannel sound reproduction Dec. 30, 1997
5703954 Method and apparatus for improving the quality of AM compatible digital broadcast system signals in the presence of distortion Dec. 30, 1997
5701344 Audio processing apparatus Dec. 23, 1997
5692050 Method and apparatus for spatially enhancing stereo and monophonic signals Nov. 25, 1997
5692051 Electronic equalization for recessed loudspeaker mounting Nov. 25, 1997
5684881 Sound field and sound image control apparatus and method Nov. 4, 1997
5682433 Audio signal processor for simulating the notional sound source Oct. 28, 1997
5677957 Audio circuit producing enhanced ambience Oct. 14, 1997
5671287 Stereophonic signal processor Sep. 23, 1997
5666136 Audio equipment and method of displaying operation thereof Sep. 9, 1997
5666422 Remote speaker for surround-sound applications Sep. 9, 1997
5666425 Plural-channel sound processing Sep. 9, 1997
5661808 Stereo enhancement system Aug. 26, 1997
5659619 Three-dimensional virtual audio display employing reduced complexity imaging filters Aug. 19, 1997
5657391 Sound image enhancement apparatus Aug. 12, 1997
5642424 Device for connecting external sound generator Jun. 24, 1997
5642422 Digital surround sound method and apparatus Jun. 24, 1997
5636283 Processing audio signals Jun. 3, 1997
5633938 Audio track mixing processor May. 27, 1997
5610986 Linear-matrix audio-imaging system and image analyzer Mar. 11, 1997
5604809 Sound field control system Feb. 18, 1997
5594801 Ambient expansion loudspeaker system Jan. 14, 1997
5590161 Apparatus for synchronizing digital data without using overhead frame bits by using deliberately introduced errors for indicating superframe synchronization of audio signals Dec. 31, 1996
5579395 Stereo decoder with cross-talk compensation Nov. 26, 1996
5579396 Surround signal processing apparatus Nov. 26, 1996
5572591 Sound field controller Nov. 5, 1996
5557680 Loudspeaker system for producing multiple sound images within a listening area from dual source locations Sep. 17, 1996
5550920 Voice canceler with simulated stereo output Aug. 27, 1996
5541999 Audio apparatus having a karaoke function Jul. 30, 1996
5515442 Mono/stereo switching circuit May. 7, 1996
5509078 Circuit for preventing crosstalk Apr. 16, 1996
5506907 Channel audio signal encoding method Apr. 9, 1996
5497425 Multi channel surround sound simulation device Mar. 5, 1996
5487113 Method and apparatus for generating audiospatial effects Jan. 23, 1996
5459790 Personal sound system with virtually positioned lateral speakers Oct. 17, 1995
5440638 Stereo enhancement system Aug. 8, 1995
5440637 Listening and display unit Aug. 8, 1995
5434921 Stereo image control circuit Jul. 18, 1995
5432855 Stereo and dual audio signal identifying system Jul. 11, 1995
5426622 Multi-mode audio imaging control device having unitary control element Jun. 20, 1995
5420929 Signal processor for sound image enhancement May. 30, 1995
5414774 Circuit and method for controlling an audio system May. 9, 1995
5412731 Automatic stereophonic manipulation system and apparatus for image enhancement May. 2, 1995

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










 
 
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