| Patents for H04S 3 - Systems employing more than two channels, e.g. quadraphonic (4,597) |
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| 02/10/1998 | US5717765 Method of processing an audio signal for reproduction |
| 02/10/1998 | US5717764 Global masking thresholding for use in perceptual coding |
| 02/04/1998 | CN1172320A Method and apparatus for simulating sound in virtual space to have listenen enjoy artificial experience of sound |
| 02/03/1998 | US5715318 Audio signal processing |
| 01/29/1998 | WO1998004100A1 Multichannel active matrix sound reproduction with maximum lateral separation |
| 01/28/1998 | EP0820663A1 7-channel transmission, compatible with 5-channel transmission and 2-channel transmission |
| 01/22/1998 | WO1998003037A1 Coding and decoding of audio signals by using intensity stereo and prediction processes |
| 01/21/1998 | EP0820213A2 Sound reproduction |
| 01/13/1998 | US5708719 In-home theater surround sound speaker system |
| 01/13/1998 | US5708718 Surround sound processor system |
| 01/06/1998 | CA2071708C Audio surround system with stereo enhancement and directivity servos |
| 12/30/1997 | US5703955 Method and apparatus for multichannel sound reproduction |
| 12/29/1997 | EP0814638A2 Three-dimensional sound reproducing apparatus and a three-dimensional sound reproduction method |
| 12/24/1997 | WO1997049262A1 Method and apparatus for providing sound in a spatial environment |
| 12/24/1997 | CA2258652A1 Method and apparatus for providing sound in a spatial environment |
| 12/23/1997 | US5701346 Method of coding a plurality of audio signals |
| 12/11/1997 | DE19628293C1 Codieren und Decodieren von Audiosignalen unter Verwendung von Intensity-Stereo und Prädiktion Encoding and decoding of audio signals by using intensity stereo prediction and |
| 12/10/1997 | EP0811295A2 A method and device for encoding, transferring and decoding a non-pcm bitstream between a digital versatile disc device and a multi-channel reproduction apparatus |
| 11/19/1997 | EP0808076A1 Surround system |
| 11/19/1997 | EP0807366A1 In-home theater surround sound speaker system |
| 11/18/1997 | US5689570 Sound reproducing array processor system |
| 11/06/1997 | WO1997041711A1 Audio enhancement system for use in a surround sound environment |
| 11/06/1997 | CA2252595A1 Audio enhancement system for use in a surround sound environment |
| 10/30/1997 | WO1997040642A1 Six-axis surround sound processor with automatic balancing and calibration |
| 10/28/1997 | US5682461 Method of transmitting or storing digitalized, multi-channel audio signals |
| 10/28/1997 | US5682433 Audio signal processor for simulating the notional sound source |
| 10/21/1997 | US5680464 Sound field controlling device |
| 10/16/1997 | WO1997038494A1 Encoding apparatus for encoding a plurality of information signals |
| 10/16/1997 | WO1997038493A1 Encoding of a plurality of information signals |
| 10/15/1997 | EP0712564B1 Multi-channel transmitter/receiver system providing matrix-decoding compatible signals |
| 10/09/1997 | WO1997037512A1 Six-axis surround sound processor with improved matrix and cancellation control |
| 09/18/1997 | WO1997025834A3 Method and device for processing a multi-channel signal for use with a headphone |
| 09/09/1997 | US5666424 Six-axis surround sound processor with automatic balancing and calibration |
| 09/09/1997 | US5666136 Audio equipment and method of displaying operation thereof |
| 09/04/1997 | WO1997032449A1 Sound reproducing array processor system |
| 08/26/1997 | US5661812 Head mounted surround sound system |
| 08/20/1997 | EP0790753A1 System for sound spatial effect and method therefor |
| 08/14/1997 | WO1997029555A1 N-channel transmission, compatible with 2-channel transmission and 1-channel transmission |
| 08/14/1997 | WO1997029554A1 7-channel transmission, compatible with 5-channel transmission and 2-channel transmission |
| 08/13/1997 | EP0788723A1 Method and apparatus for efficient presentation of high-quality three-dimensional audio |
| 07/31/1997 | WO1997027724A1 Sound system |
| 07/17/1997 | WO1997025834A2 Method and device for processing a multi-channel signal for use with a headphone |
| 07/17/1997 | WO1997021310A3 A method and device for encoding, transferring and decoding a non-pcm bitstream between a digital versatile disc device and a multi-channel reproduction apparatus |
| 07/03/1997 | WO1997024012A1 Surround sound processor with improved control voltage generator |
| 07/02/1997 | EP0782372A2 5-2-5 Matrix system |
| 07/02/1997 | CN1153367A Audio system which not only enables application of surround system standard to special playback uses but also easily maintains compatibility with surround system |
| 07/01/1997 | US5644640 Surround sound processor with improved control voltage generator |
| 06/24/1997 | US5642423 Digital surround sound processor |
| 06/24/1997 | US5642422 Digital surround sound method and apparatus |
| 06/17/1997 | CA2073615C System for calibrating sound field |
| 06/12/1997 | WO1997021310A2 A method and device for encoding, transferring and decoding a non-pcm bitstream between a digital versatile disc device and a multi-channel reproduction apparatus |
| 06/12/1997 | WO1997021211A1 Multi-channel predictive subband coder using psychoacoustic adaptive bit allocation |
| 06/11/1997 | EP0664943B1 Adaptive rematrixing of matrixed audio signals |
| 06/10/1997 | US5638452 Expandable multi-dimensional sound circuit |
| 06/10/1997 | US5638451 Transmission and storage of multi-channel audio-signals when using bit rate-reducing coding methods |
| 06/04/1997 | EP0776592A1 Sound recording and reproduction systems |
| 06/03/1997 | US5636283 Processing audio signals |
| 05/27/1997 | US5633981 Method and apparatus for adjusting dynamic range and gain in an encoder/decoder for multidimensional sound fields |
| 05/20/1997 | US5632005 Encoder/decoder for multidimensional sound fields |
| 05/20/1997 | US5631964 Audio apparatus |
| 04/29/1997 | US5625696 Six-axis surround sound processor with improved matrix and cancellation control |
| 04/09/1997 | EP0645070B1 Stereophonic sound reproduction device using several loudspeakers in each channel |
| 04/08/1997 | US5619220 Sound image display method and apparatus |
| 03/13/1997 | WO1997009851A1 In-home theater surround sound speaker system |
| 03/13/1997 | CA2214045A1 In-home theater surround sound speaker system |
| 03/11/1997 | US5610986 Linear-matrix audio-imaging system and image analyzer |
| 03/11/1997 | US5610985 Digital 3-channel transmission of left and right stereo signals and a center signal |
| 03/05/1997 | EP0760197A1 Three-dimensional virtual audio display employing reduced complexity imaging filters |
| 03/04/1997 | US5608805 Dynamic loader |
| 02/11/1997 | US5602923 Theater sound system with upper surround channels |
| 02/11/1997 | US5602922 Method and apparatus for processing an audio signal by surround modes |
| 02/06/1997 | WO1997004621A1 Process for reducing redundancy during the coding of multichannel signals and device for decoding redundancy-reduced multichannel signals |
| 02/05/1997 | EP0757506A2 Compatible audio system for special playback applications with surround system |
| 02/04/1997 | US5600727 Determination of position |
| 02/04/1997 | CA2047037C Surround sound effect control device |
| 01/23/1997 | DE19526366A1 Verfahren zur Redundanzreduktion bei der Codierung von mehrkanaligen Signalen und Vorrichtung zur Dekodierung von redundanzreduzierten, mehrkanaligen Signalen A method for reducing redundancy during the coding of multichannel signals and apparatus for decoding redundancy-reduced multichannel signals |
| 01/21/1997 | US5596644 Method and apparatus for efficient presentation of high-quality three-dimensional audio |
| 01/14/1997 | US5594800 Sound reproduction system having a matrix converter |
| 01/02/1997 | EP0750811A1 Process for coding a plurality of audio signals |
| 01/02/1997 | EP0649588B1 Transmission and storage of multi-channel audio-signals when using a bit rate-reducing coding process |
| 12/31/1996 | US5590207 Sound reproducing array processor system |
| 12/31/1996 | US5590204 Device for reproducing 2-channel sound field and method therefor |
| 12/31/1996 | US5590094 System and methd for reproducing sound |
| 12/24/1996 | CA2126903C Digital surround sound method and apparatus |
| 12/17/1996 | US5585587 Acoustic image localization apparatus for distributing tone color groups throughout sound field |
| 12/12/1996 | WO1996039754A1 Ultrasonic sound system and method for producing virtual sound |
| 12/10/1996 | US5583962 For encoding two or more audio channels |
| 12/04/1996 | EP0746177A2 Apparatus for generating surround sound from stereo signals of an audio source |
| 11/26/1996 | US5579395 Stereo decoder with cross-talk compensation |
| 10/30/1996 | EP0740487A2 Stereophonic sound field expansion device |
| 10/24/1996 | WO1996033591A1 An acoustical audio system for producing three dimensional sound image |
| 10/24/1996 | CA2218608A1 An acoustical audio system for producing three dimensional sound image |
| 10/17/1996 | DE19513720A1 Audio signal supply for stereo-headsets e.g. for CD or DAT player |
| 10/16/1996 | EP0519055B1 Decoder for variable-number of channel presentation of multidimensional sound fields |
| 10/02/1996 | EP0735796A2 Method and apparatus for reproducing three-dimensional virtual space sound |
| 10/01/1996 | CA2171370A1 Method and apparatus for reproducing three-dimensional virtual space sound |
| 09/25/1996 | EP0643886B1 Dynamic loader |
| 09/25/1996 | CN1131894A Triple-path high-fidelity acoustics system |
| 09/04/1996 | EP0730365A2 Audio communication control unit |
| 08/13/1996 | US5546465 Audio playback apparatus and method |