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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
6002774 Arrangement, a system, a circuit and a method for enhancing a stereo image Dec. 14, 1999
5995631 Sound image localization apparatus, stereophonic sound image enhancement apparatus, and sound image control system Nov. 30, 1999
5991385 Enhanced audio teleconferencing with sound field effect Nov. 23, 1999
5987141 Stereo expander Nov. 16, 1999
5983087 Distributed digital signal processing for vehicle audio systems Nov. 9, 1999
5974153 Method and system for sound expansion Oct. 26, 1999
5974152 Sound image localization control device Oct. 26, 1999
5970152 Audio enhancement system for use in a surround sound environment Oct. 19, 1999
5946400 Three-dimensional sound processing system Aug. 31, 1999
5943427 Method and apparatus for three dimensional audio spatialization Aug. 24, 1999
5937071 Sound field expanding apparatus with improved tone control system Aug. 10, 1999
5930733 Stereophonic image enhancement devices and methods using lookup tables Jul. 27, 1999
5917916 Audio reproduction systems Jun. 29, 1999
5912975 Method and circuit for creating phantom sources using phase shifting circuitry Jun. 15, 1999
5912976 Multi-channel audio enhancement system for use in recording and playback and methods for providing same Jun. 15, 1999
5910990 Apparatus and method for automatic equalization of personal multi-channel audio system Jun. 8, 1999
5896456 Automatic stereophonic manipulation system and apparatus for image enhancement Apr. 20, 1999
5892830 Stereo enhancement system Apr. 6, 1999
5892831 Method and circuit for creating an expanded stereo image using phase shifting circuitry Apr. 6, 1999
5890125 Method and apparatus for encoding and decoding multiple audio channels at low bit rates using adaptive selection of encoding method Mar. 30, 1999
5889867 Stereophonic Reformatter Mar. 30, 1999
5889843 Methods and systems for creating a spatial auditory environment in an audio conference system Mar. 30, 1999
5883962 Method and apparatus for spatially enhancing stereo and monophonic signals Mar. 16, 1999
5883961 Sound system Mar. 16, 1999
5878145 Electronic circuit and process for creation of three-dimensional audio effects and corresponding sound recording Mar. 2, 1999
5872851 Dynamic stereophonic enchancement signal processing system Feb. 16, 1999
5850454 Method and apparatus for spatially enhancing stereo and monophonic signals Dec. 15, 1998
5850453 Acoustic correction apparatus Dec. 15, 1998
5850455 Discrete dynamic positioning of audio signals in a 360.degree. environment Dec. 15, 1998
5844993 Surround signal processing apparatus Dec. 1, 1998
5838800 Apparatus for enhancing stereo effect with central sound image maintenance circuit Nov. 17, 1998
5835895 Infinite impulse response filter for 3D sound with tap delay line initialization Nov. 10, 1998
5822438 Sound-image position control apparatus Oct. 13, 1998
5822437 Signal modification circuit Oct. 13, 1998
5818418 Audio equipment and method of displaying operation thereof Oct. 6, 1998
5815578 Method and apparatus for canceling leakage from a speaker Sep. 29, 1998
5812677 Acoustic signal processing method and apparatus Sep. 22, 1998
5812672 Method for reducing data in the transmission and/or storage of digital signals of several dependent channels Sep. 22, 1998
5799094 Surround signal processing apparatus and video and audio signal reproducing apparatus Aug. 25, 1998
5796845 Sound field and sound image control apparatus and method Aug. 18, 1998
5768394 Surround audio signal reproducing apparatus having a sub-woofer signal mixing function Jun. 16, 1998
5764775 Audio processing unit for mixing L channel and R channel of CD/CD-1 audio signal Jun. 9, 1998
5761315 Surround signal processing apparatus Jun. 2, 1998
5761313 Circuit for improving the stereo image separation of a stereo signal Jun. 2, 1998
5748746 Ceiling speaker and signal source May. 5, 1998
5748745 Analog vector processor and method for producing a binaural signal May. 5, 1998
5742687 Signal processing circuit including a signal combining circuit stereophonic audio reproduction system including the signal processing circuit and an audio-visual reproduction system including Apr. 21, 1998
5740253 Sterophonic sound field expansion device Apr. 14, 1998
5729612 Method and apparatus for measuring head-related transfer functions Mar. 17, 1998
5727067 Sound field control device Mar. 10, 1998

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










 
 
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