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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
7088827 Reconfigurable speaker system Aug. 8, 2006
7085393 Method and apparatus for regularizing measured HRTF for smooth 3D digital audio Aug. 1, 2006
7079658 System and method for localization of sounds in three-dimensional space Jul. 18, 2006
7076071 Process for enhancing the existing ambience, imaging, depth, clarity and spaciousness of sound recordings Jul. 11, 2006
7072474 Sound recording and reproduction systems Jul. 4, 2006
7054816 Audio signal processing device May. 30, 2006
7043031 Acoustic correction apparatus May. 9, 2006
7031474 Acoustic correction apparatus Apr. 18, 2006
7024002 Method and apparatus for spatially enhancing the stereo image in sound reproduction and reinforcement systems Apr. 4, 2006
7010128 Method of processing and reproducing an audio stereo signal and an audio stereo signal reproduction system Mar. 7, 2006
7006636 Coherence-based audio coding and synthesis Feb. 28, 2006
6999590 Stereo sound circuit device for providing three-dimensional surrounding effect Feb. 14, 2006
6996239 System for transitioning from stereo to simulated surround sound Feb. 7, 2006
6961433 Stereophonic sound field reproducing apparatus Nov. 1, 2005
6956954 Surround-sound processing system Oct. 18, 2005
6952621 Single-chip audio circuits, methods, and systems using the same Oct. 4, 2005
6947564 Stereophonic spatial expansion circuit with tonal compensation and active matrixing Sep. 20, 2005
6931136 Infrared emitter Aug. 16, 2005
6928168 Transparent stereo widening algorithm for loudspeakers Aug. 9, 2005
6925184 Method for converting two-channel audio system into multichannel audio system and an audio processor thereof Aug. 2, 2005
6925426 Process for high fidelity sound recording and reproduction of musical sound Aug. 2, 2005
6868161 Transmitting/receiving device and transmitting/receiving method Mar. 15, 2005
6862356 Audio device Mar. 1, 2005
6853869 Method and apparatus for generating surround-sound data Feb. 8, 2005
6842524 Method for localizing sound image of reproducing sound of audio signals for stereophonic reproduction outside speakers Jan. 11, 2005
6804358 Sound image localizing processor Oct. 12, 2004
6798887 Key click masker and method for masking key clicks Sep. 28, 2004
6795556 Method of modifying one or more original head related transfer functions Sep. 21, 2004
6788789 Phase conversion surround circuitry Sep. 7, 2004
6782308 Robot performing dance along music Aug. 24, 2004
6777718 Semiconductor optical device Aug. 17, 2004
6771778 Method and signal processing device for converting stereo signals for headphone listening Aug. 3, 2004
6768798 Method of customizing HRTF to improve the audio experience through a series of test sounds Jul. 27, 2004
6760446 Point source speaker system Jul. 6, 2004
6754350 Surround reproducing circuit Jun. 22, 2004
6738479 Method of audio signal processing for a loudspeaker located close to an ear May. 18, 2004
6735314 Expanded stereophonic circuit with tonal compensation May. 11, 2004
6718039 Acoustic correction apparatus Apr. 6, 2004
6714652 Dynamic decorrelator for audio signals Mar. 30, 2004
6711268 Automatic stereo/monaural headphone Mar. 23, 2004
6707917 Monaural and stereo audio signal control system Mar. 16, 2004
6700980 Method and device for synthesizing a virtual sound source Mar. 2, 2004
6690799 Stereo signal processing apparatus Feb. 10, 2004
6683959 Stereophonic device and stereophonic method Jan. 27, 2004
6683962 Method and system for driving speakers with a 90 degree phase shift Jan. 27, 2004
6668061 Crosstalk canceler Dec. 23, 2003
6658116 Stereo radio receiver Dec. 2, 2003
6658310 Method of entering audio signal, method of transmitting audio signal, audio signal transmitting apparatus, and audio signal receiving and reproducing apparatus Dec. 2, 2003
6643375 Method of processing a plural channel audio signal Nov. 4, 2003
6636608 Pseudo-stereo circuit Oct. 21, 2003

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










 
 
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