| Patents for H04S 3 - Systems employing more than two channels, e.g. quadraphonic (4,597) |
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| 02/02/2000 | EP0977464A2 Audio signal processing circuit |
| 02/02/2000 | EP0976306A1 Surround sound reproduction system, sound/visual reproduction system, surround signal processing unit and method for processing an input surround signal |
| 02/01/2000 | US6021386 Coding method and apparatus for multiple channels of audio information representing three-dimensional sound fields |
| 02/01/2000 | US6021206 Methods and apparatus for processing spatialised audio |
| 01/27/2000 | WO2000004744A1 Multi-channel audio surround system |
| 01/26/2000 | EP0975158A1 Circuit for selecting audio sources |
| 01/20/2000 | WO2000003562A1 Audio signal processor and audio device |
| 01/18/2000 | US6016473 Low bit-rate spatial coding method and system |
| 01/18/2000 | US6016295 Audio system which not only enables the application of the surround sytem standard to special playback uses but also easily maintains compatibility with a surround system |
| 01/13/2000 | WO2000002357A1 Transcoders for fixed and variable rate data streams |
| 01/12/2000 | EP0971560A2 Multiple voicecoil and driver transducing |
| 01/12/2000 | EP0910928B1 Coding and decoding of audio signals by using intensity stereo and prediction processes |
| 01/05/2000 | EP0968625A1 Audiochannel mixing |
| 12/29/1999 | EP0966865A2 Multidirectional audio decoding |
| 12/28/1999 | US6009179 Method and apparatus for electronically embedding directional cues in two channels of sound |
| 12/22/1999 | EP0966179A2 A method of synthesising an audio signal |
| 12/22/1999 | EP0965247A1 Multi-channel audio enhancement system for use in recording and playback and methods for providing same |
| 12/21/1999 | US6005949 Surround sound effect control device |
| 12/21/1999 | US6005948 Audio channel mixing |
| 12/15/1999 | EP0963682A1 Six-axis surround sound processor with improved matrix and cancellation control |
| 12/14/1999 | US6002775 Method and apparatus for electronically embedding directional cues in two channels of sound |
| 12/01/1999 | EP0961523A1 Music spatialisation system and method |
| 11/25/1999 | WO1999033325A3 Surround signal processing apparatus and method |
| 11/24/1999 | EP0959644A2 Method of modifying a filter for implementing a head-related transfer function |
| 11/16/1999 | US5987142 System of sound spatialization and method personalization for the implementation thereof |
| 11/11/1999 | WO1999057941A1 Matrix-encoded surround-sound channels in a discrete digital sound format |
| 11/02/1999 | US5978762 Digitally encoded machine readable storage media using adaptive bit allocation in frequency, time and over multiple channels |
| 10/27/1999 | EP0951800A1 Six-axis surround sound processor with automatic balancing and calibration |
| 10/26/1999 | US5974380 Multi-channel audio decoder |
| 10/19/1999 | US5970152 Audio enhancement system for use in a surround sound environment |
| 10/14/1999 | WO1999052326A1 Low bit-rate spatial coding method and system |
| 10/13/1999 | EP0949845A2 Qsound surround synthesis from stereo |
| 10/13/1999 | EP0948875A1 Processing audio signals |
| 10/09/1999 | CA2268378A1 Qsound surround synthesis from stereo |
| 10/07/1999 | WO1999051063A1 Headtracked processing for headtracked playback of audio signals |
| 10/07/1999 | WO1999051062A1 Formulation of complex room impulse responses from 3-d audio information |
| 10/06/1999 | CN1230867A Sound reproducing device, earphone device and signal processing device therefor |
| 09/30/1999 | WO1999049574A1 Audio signal processing method and apparatus |
| 09/29/1999 | EP0946079A1 Method and apparatus for presenting digital surround sound data |
| 09/29/1999 | CN1230331A Recording and play-back two-channel system for providing holophonic reproduction of sounds |
| 09/29/1999 | CN1045360C Video matrix stereo audio recording and playing system |
| 09/28/1999 | US5960037 Encoding of a plurality of information signals |
| 09/23/1999 | WO1999048327A1 In-home theater surround sound speaker system |
| 09/23/1999 | CA2324224A1 In-home theater surround sound speaker system |
| 09/21/1999 | US5956674 Multi-channel predictive subband audio coder using psychoacoustic adaptive bit allocation in frequency, time and over the multiple channels |
| 09/16/1999 | WO1999004498A3 Method and apparatus for encoding and decoding multiple audio channels at low bit rates |
| 09/14/1999 | US5953067 Multichannel television sound stereo and surround sound encoder |
| 09/08/1999 | CN1228237A Multichannel active matrix sound reproduction with maximum lateral separation |
| 08/31/1999 | CA2160840C Surround sound processor with improved control voltage generator |
| 08/19/1999 | WO1999041947A1 Surround sound reproduction system, sound/visual reproduction system, surround signal processing unit and method for processing an input surround signal |
| 08/12/1999 | WO1999040756A1 Headphone apparatus |
| 08/04/1999 | EP0933006A1 Transaural stereo device |
| 08/04/1999 | EP0677235B1 Sound image manipulation apparatus for sound image enhancement |
| 07/28/1999 | EP0932324A2 Sound reproducing device, earphone device and signal processing device therefor |
| 07/27/1999 | US5930370 In-home theater surround sound speaker system |
| 07/22/1999 | WO1999037120A1 Microphone apparatus for producing signals for surround reproduction |
| 07/22/1999 | DE19860600A1 Car audio system producing phase shift in front section of car |
| 07/14/1999 | CN1223064A Audio enhancement system for use in surround sound environment |
| 07/13/1999 | CA2170545C Audio communication control unit |
| 07/01/1999 | WO1999033325A2 Surround signal processing apparatus and method |
| 06/30/1999 | CN1221283A Television set comprising loudspeakers and decoder with surround-sound audio signals |
| 06/23/1999 | EP0923848A1 Multichannel active matrix sound reproduction with maximum lateral separation |
| 06/17/1999 | WO1999030532A1 Apparatus for the creation of a desirable acoustical virtual reality |
| 06/15/1999 | US5912976 System for processing at least four discrete audio signals |
| 06/08/1999 | US5910990 Apparatus and method for automatic equalization of personal multi-channel audio system |
| 06/02/1999 | EP0919109A1 Recording and play-back two-channel system for providing a holophonic reproduction of sounds |
| 06/01/1999 | US5909664 Method and apparatus for encoding and decoding audio information representing three-dimensional sound fields |
| 05/27/1999 | WO1999026455A1 Post-amplification stereophonic to surround sound decoding circuit |
| 05/27/1999 | CA2308576A1 Post-amplification stereophonic to surround sound decoding circuit |
| 05/26/1999 | CN1217627A Acoustic-image positioning treatment apparatus and method thereof |
| 05/25/1999 | US5907827 Channel synchronized audio data compression and decompression for an in-flight entertainment system |
| 05/19/1999 | EP0917400A2 An apparatus for localizing a sound image and a method for localizing the same |
| 05/12/1999 | EP0629335B1 Surround sound apparatus |
| 04/28/1999 | EP0910928A1 Coding and decoding of audio signals by using intensity stereo and prediction processes |
| 04/21/1999 | EP0910226A2 Television set comprising loudspeakers and a decoder for surround-sound audio signals |
| 04/20/1999 | US5896456 Automatic stereophonic manipulation system and apparatus for image enhancement |
| 04/20/1999 | US5896358 Audio system which not only enables the application of the surround system standard to special playback uses but also easily maintains compatibility with a surround system |
| 04/15/1999 | WO1998035495A8 Multichannel television sound stereo and surround sound encoder |
| 04/07/1999 | CN1213107A Memory allocation for real-time audio processing |
| 03/30/1999 | US5890125 Method and apparatus for encoding and decoding multiple audio channels at low bit rates using adaptive selection of encoding method |
| 03/30/1999 | US5889867 Stereophonic Reformatter |
| 03/25/1999 | WO1999014983A1 Utilisation of filtering effects in stereo headphone devices to enhance spatialization of source around a listener |
| 03/25/1999 | DE19843634A1 Memory location assignment method for real-time audio data |
| 03/24/1999 | EP0903057A1 Method and apparatus for providing sound in a spatial environment |
| 03/16/1999 | US5883961 Sound system |
| 03/11/1999 | WO1999012386A1 5-2-5 matrix encoder and decoder system |
| 03/11/1999 | WO1998058522A3 Sound reproduction system |
| 03/02/1999 | US5878080 N-channel transmission, compatible with 2-channel transmission and 1-channel transmission |
| 02/24/1999 | EP0897651A1 Audio enhancement system for use in a surround sound environment |
| 02/17/1999 | CN1208489A Multi-channel predictive subband coder using psychoacoustic adaptive bit allocation |
| 02/16/1999 | US5873065 Two-stage compression and expansion of coupling processed multi-channel sound signals for transmission and recording |
| 02/16/1999 | US5872851 Dynamic stereophonic enchancement signal processing system |
| 02/09/1999 | US5870480 Multichannel active matrix encoder and decoder with maximum lateral separation |
| 02/03/1999 | CN1207008A Sound field equalizer for loudspeak system |
| 01/28/1999 | WO1999004498A2 Method and apparatus for encoding and decoding multiple audio channels at low bit rates |
| 01/21/1999 | WO1998035495A3 Multichannel television sound stereo and surround sound encoder |
| 01/20/1999 | EP0892582A2 Method and apparatus for error masking in multi-channel audio signals |
| 01/20/1999 | CN1205599A Compressed code decoding device and audio decoding device |
| 01/19/1999 | US5862228 For encoding a single digital audio signal |
| 01/19/1999 | US5862227 Sound recording and reproduction systems |