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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 307
381/27 Center channel 156
381/23.1 Hearing aid 143
381/17 Pseudo stereophonic 788
381/19 Quadrasonic 202
381/26 Stereo sound pickup device (microphone) 160
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
6621906 Sound field generation system Sep. 16, 2003
6618486 Controller for FM 412 multiplex power regulation Sep. 9, 2003
6614910 Stereo sound expander Sep. 2, 2003
6608902 Stereo signal separation circuit and application thereof Aug. 19, 2003
6606388 Method and system for enhancing audio signals Aug. 12, 2003
6597791 Audio enhancement system Jul. 22, 2003
6587565 System for improving a spatial effect of stereo sound or encoded sound Jul. 1, 2003
6584202 Method and device for reproducing a stereophonic audiosignal Jun. 24, 2003
6546105 Sound image localization device and sound image localization method Apr. 8, 2003
6522751 Stereophonic signal processing apparatus Feb. 18, 2003
6519344 Audio system Feb. 11, 2003
6507657 Stereophonic sound image enhancement apparatus and stereophonic sound image enhancement method Jan. 14, 2003
6504933 Three-dimensional sound system and method using head related transfer function Jan. 7, 2003
6504934 Apparatus and method for localizing sound image Jan. 7, 2003
6498857 Method of synthesizing an audio signal Dec. 24, 2002
6498856 Vehicle-carried sound reproduction apparatus Dec. 24, 2002
6473497 Digital telephone set Oct. 29, 2002
6470087 Device for reproducing multi-channel audio by using two speakers and method therefor Oct. 22, 2002
6449368 Multidirectional audio decoding Sep. 10, 2002
6442277 Method and apparatus for loudspeaker presentation for positional 3D sound Aug. 27, 2002
6424719 Acoustic crosstalk cancellation system Jul. 23, 2002
6385320 Surround signal processing apparatus and method May. 7, 2002
6360200 Process for reducing redundancy during the coding of multichannel signals and device for decoding redundancy-reduced multichannel signals Mar. 19, 2002
6356639 AUDIO DECODING APPARATUS, SIGNAL PROCESSING DEVICE, SOUND IMAGE LOCALIZATION DEVICE, SOUND IMAGE CONTROL METHOD, AUDIO SIGNAL PROCESSING DEVICE, AND AUDIO SIGNAL HIGH-RATE REPRODUCTION METHOD Mar. 12, 2002
6307941 System and method for localization of virtual sound Oct. 23, 2001
6292570 Surround sound Sep. 18, 2001
6285767 Low-frequency audio enhancement system Sep. 4, 2001
6281749 Sound enhancement system Aug. 28, 2001
6282247 Method and apparatus for digital compensation of radio distortion over a wide range of temperatures Aug. 28, 2001
6246772 Wireless headphone/speakers sound field control circuit Jun. 12, 2001
6243476 Method and apparatus for producing binaural audio for a moving listener Jun. 5, 2001
6192086 Digital sub-systems and building blocks for a mostly digital low-cost BTSC compatible encoder Feb. 20, 2001
6178245 Audio signal generator to emulate three-dimensional audio signals Jan. 23, 2001
6173061 Steering of monaural sources of sound using head related transfer functions Jan. 9, 2001
6169812 Point source speaker system Jan. 2, 2001
6122381 Stereophonic sound system Sep. 19, 2000
6118875 Binaural synthesis, head-related transfer functions, and uses thereof Sep. 12, 2000
6111958 Audio spatial enhancement apparatus and methods Aug. 29, 2000
6097558 Digital audio signal transmission apparatus with data blocks of varying sizes Aug. 1, 2000
6067360 Apparatus for localizing a sound image and a method for localizing the same May. 23, 2000
6067072 Audio equipment and method of displaying operating thereof May. 23, 2000
6052470 System for processing audio surround signal Apr. 18, 2000
6044307 Method of entering audio signal, method of transmitting audio signal, audio signal transmitting apparatus, and audio signal receiving and reproducing apparatus Mar. 28, 2000
6038323 Stereophonic image enhancement system for use in automobiles Mar. 14, 2000
6035045 Sound image localization method and apparatus, delay amount control apparatus, and sound image control apparatus with using delay amount control apparatus Mar. 7, 2000
6026168 Methods and apparatus for automatically synchronizing and regulating volume in audio component systems Feb. 15, 2000
6009178 Method and apparatus for crosstalk cancellation Dec. 28, 1999
6005947 Technique for enhancing stereo sound Dec. 21, 1999
6002775 Method and apparatus for electronically embedding directional cues in two channels of sound Dec. 14, 1999
6002774 Arrangement, a system, a circuit and a method for enhancing a stereo image Dec. 14, 1999

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