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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
5400405 Audio image enhancement system Mar. 21, 1995
5400411 Volume/balance control apparatus Mar. 21, 1995
5394472 Monaural to stereo sound translation process and apparatus Feb. 28, 1995
5386473 Passive surround sound circuit Jan. 31, 1995
5386082 Method of detecting localization of acoustic image and acoustic image localizing system Jan. 31, 1995
5384856 Acoustic system Jan. 24, 1995
5381482 Sound field controller Jan. 10, 1995
5343531 Audio reproducing apparatus Aug. 30, 1994
5341457 Perceptual coding of audio signals Aug. 23, 1994
5333199 Digital signal processor for simultaneously processing left and right signals Jul. 26, 1994
5333200 Head diffraction compensated stereo system with loud speaker array Jul. 26, 1994
5325435 Sound field offset device Jun. 28, 1994
5305386 Apparatus for expanding and controlling sound fields Apr. 19, 1994
5278909 System and method for stereo digital audio compression with co-channel steering Jan. 11, 1994
5274708 Digital stereo sound enhancement unit and method Dec. 28, 1993
5272756 Method and apparatus for determining phase correlation of a stereophonic signal Dec. 21, 1993
5265166 Multi-channel sound simulation system Nov. 23, 1993
5263086 Audio accessory circuit Nov. 16, 1993
5251260 Audio surround system with stereo enhancement and directivity servos Oct. 5, 1993
5228085 Perceived sound Jul. 13, 1993
5222156 Object information processing apparatus Jun. 22, 1993
5189703 Timbre correction units for use in sound systems Feb. 23, 1993
5165099 Balance control circuit Nov. 17, 1992
5164840 Apparatus for supplying control codes to sound field reproduction apparatus Nov. 17, 1992
5161196 Apparatus and method for reducing motion sickness Nov. 3, 1992
5153362 Electronic musical instrument having pan control function Oct. 6, 1992
5140637 Device and method for removing vocal signals Aug. 18, 1992
5136650 Sound reproduction Aug. 4, 1992
5121433 Apparatus and method for controlling the magnitude spectrum of acoustically combined signals Jun. 9, 1992
5119420 Device for correcting a sound field in a narrow space Jun. 2, 1992
5109415 Audio signal processing system performing balance control in both amplitude and phase of audio signal Apr. 28, 1992
5109416 Dipole speaker for producing ambience sound Apr. 28, 1992
5099739 Musical tone generating aparatus Mar. 31, 1992
5095506 Sound reproduction system utilizing sound extinction device Mar. 10, 1992
5067157 Noise reduction apparatus in an FM stereo tuner Nov. 19, 1991
5065432 Sound effect system Nov. 12, 1991
5056148 Output circuit of audio device Oct. 8, 1991
5042068 Audio spatial equalization system Aug. 20, 1991
5027687 Sound field control device Jul. 2, 1991
5023913 Apparatus for changing a sound field Jun. 11, 1991
5020098 Telephone conferencing arrangement May. 28, 1991
4984273 Enhancing bass Jan. 8, 1991
4982437 Method of cutting an object as a function of particularities of said object Jan. 1, 1991
4980914 Sound field correction system Dec. 25, 1990
4975954 Head diffraction compensated stereo system with optimal equalization Dec. 4, 1990
4972482 Fm stereo demodulator Nov. 20, 1990
4953212 Auto voice changing apparatus Aug. 28, 1990
4933768 Sound reproducer Jun. 12, 1990
4910779 Head diffraction compensated stereo system with optimal equalization Mar. 20, 1990
4910778 Signal enhancement processor for stereo system Mar. 20, 1990

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










 
 
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