| Patents for H04S 3 - Systems employing more than two channels, e.g. quadraphonic (4,597) |
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| 08/07/1996 | CN1128481A Plug-in voice box for car |
| 07/31/1996 | EP0724378A2 Surround signal processing apparatus |
| 06/25/1996 | US5530760 Apparatus and method for adjusting levels between channels of a sound system |
| 06/18/1996 | US5528694 Audio signal processing arrangement for deriving a centre channel signal and also an audio visual reproduction system comprising such a processing arrangement |
| 06/04/1996 | US5524054 Method for generating a multi-channel audio decoder matrix |
| 05/22/1996 | EP0712564A1 Multi-channel transmitter/receiver system providing matrix-decoding compatible signals |
| 05/15/1996 | EP0712264A2 Method and apparatus for multi-channel sound reproduction |
| 05/15/1996 | EP0520068B1 Encoder/decoder for multidimensional sound fields |
| 05/14/1996 | US5517570 Sound reproducing array processor system |
| 05/09/1996 | WO1996013962A1 Method and apparatus for efficient presentation of high-quality three-dimensional audio |
| 04/16/1996 | US5509017 Process for simultaneous transmission of signals from N signal sources |
| 04/09/1996 | US5506907 Channel audio signal encoding method |
| 04/03/1996 | CN1119902A Method and apparatus for compressing, method for transmitting, and method and apparatus for expanding compressed multi-channel sound signals |
| 04/02/1996 | US5504819 Surround sound processor with improved control voltage generator |
| 03/05/1996 | US5497425 Multi channel surround sound simulation device |
| 02/29/1996 | WO1996006515A1 Sound recording and reproduction systems |
| 01/31/1996 | EP0695109A1 Device for reproducing video signal and audio signal |
| 01/30/1996 | US5488665 Multi-channel perceptual audio compression system with encoding mode switching among matrixed channels |
| 12/21/1995 | WO1995035012A1 The recording and reproduction of waver patterns |
| 12/21/1995 | WO1995034883A1 Signal processor and sound reproducing device |
| 12/14/1995 | WO1995034186A1 System for producing directional sound in computer-based virtual environments |
| 12/13/1995 | EP0687129A2 Generating a common bass signal |
| 11/22/1995 | EP0682850A1 Method and apparatus for compressing, method for transmitting, and method and apparatus for expanding compressed multi-channel sound signals, and recording medium for compressed multi-channel sound signals |
| 11/09/1995 | WO1995030322A1 Apparatus and method for adjusting levels between channels of a sound system |
| 10/31/1995 | US5463424 Multi-channel transmitter/receiver system providing matrix-decoding compatible signals |
| 10/19/1995 | DE19514105A1 Head phone room noise adaptation circuit |
| 10/18/1995 | EP0677235A1 Sound image manipulation apparatus and method for sound image enhancement |
| 10/17/1995 | US5459790 For providing sound effects to a listener |
| 09/28/1995 | WO1995026083A1 Process for coding a plurality of audio signals |
| 09/27/1995 | CN1109255A Video matrix stereo audio recording and playing system |
| 09/21/1995 | DE4409368A1 Verfahren zum Codieren mehrerer Audiosignale A method for encoding a plurality of audio signals |
| 09/20/1995 | CN1108856A High-fidelity sound-system voice box without frequency divider |
| 08/17/1995 | WO1995022235A1 Device for reproducing video signal and audio signal |
| 08/09/1995 | EP0666702A2 Sound image positioning apparatus |
| 08/03/1995 | WO1995020866A1 Audio reproducing device and headphones |
| 08/03/1995 | CA2141623A1 Apparatus for cross fading out of the head sound locations |
| 08/02/1995 | EP0664943A1 Adaptive rematrixing of matrixed audio signals. |
| 07/25/1995 | US5436975 Apparatus for cross fading out of the head sound locations |
| 06/27/1995 | US5428687 Control voltage generator multiplier and one-shot for integrated surround sound processor |
| 06/20/1995 | US5426720 Neurocontrolled adaptive process control system |
| 06/20/1995 | US5426702 System for deriving a center channel signal from an adapted weighted combination of the left and right channels in a stereophonic audio signal |
| 06/15/1995 | WO1995016333A1 Method and apparatus for compressing, method for transmitting, and method and apparatus for expanding compressed multi-channel sound signals, and recording medium for compressed multi-channel sound signals |
| 05/31/1995 | EP0655876A1 Perceptual coding of audio signals |
| 05/18/1995 | WO1995013690A1 Angle detector and audio playback apparatus using the detector |
| 05/02/1995 | US5412731 Automatic stereophonic manipulation system and apparatus for image enhancement |
| 04/26/1995 | EP0649588A1 Transmission and storage of multi-channel audio-signals when using a bit rate-reducing coding process. |
| 04/20/1995 | WO1995010831A1 Improvements in reverberators for use in wide band assisted reverberation systems |
| 03/30/1995 | DE4332504A1 System for providing multi-channel supply to four-channel stereo headphones |
| 03/22/1995 | EP0643886A1 Dynamic loader. |
| 03/22/1995 | EP0434691B1 Improvements in or relating to sound reproduction systems |
| 03/21/1995 | US5400433 Decoder for variable-number of channel presentation of multidimensional sound fields |
| 02/22/1995 | EP0639933A2 Method and apparatus for processing an audio signal by surround modes |
| 02/15/1995 | EP0639038A2 Circuit for converting a stereo signal |
| 02/14/1995 | US5390256 Dynamic loader |
| 02/09/1995 | WO1995004442A1 Multi-channel transmitter/receiver system providing matrix-decoding compatible signals |
| 01/24/1995 | US5384855 Audio system for vehicular application |
| 01/18/1995 | EP0634881A1 Determination of position |
| 01/11/1995 | EP0632944A1 Process for transmitting or storing digitalized, multi-channel audio signals |
| 01/10/1995 | US5381482 Sound field controller |
| 12/28/1994 | EP0631458A1 Method for obtaining a multi-channel decoder matrix |
| 12/21/1994 | EP0630168A1 Improved Dolby prologic decoder |
| 12/21/1994 | EP0629335A1 Surround sound apparatus |
| 11/22/1994 | US5367612 Neurocontrolled adaptive process control system |
| 11/22/1994 | US5367506 Sound collecting system and sound reproducing system |
| 11/09/1994 | EP0624050A2 Audio apparatus |
| 11/09/1994 | CN1026547C Surround sound effect control device |
| 10/27/1994 | WO1994024835A1 Method of reproducing sound |
| 09/07/1994 | CN1091889A Stereophonic manipulation apparatus and method for sound image enhancement |
| 08/17/1994 | EP0610282A1 Process for simultaneously transmitting audio signals from n-signal sources |
| 08/16/1994 | US5339363 Apparatus for enhancing monophonic audio signals using phase shifters |
| 08/03/1994 | EP0608937A1 Audio signal processing arrangement for deriving a centre channel signal and also an audio visual reproduction system comprising such a processing arrangement |
| 08/03/1994 | EP0608930A1 Digital 3-channel transmission of left and right stereo signals and a center signal |
| 07/26/1994 | US5333201 Multi dimensional sound circuit |
| 07/21/1994 | WO1994016538A1 Sound image manipulation apparatus and method for sound image enhancement |
| 07/21/1994 | WO1994016537A1 Stereophonic manipulation apparatus and method for sound image enhancement |
| 07/21/1994 | CA2153062A1 Sound image manipulation apparatus and method for sound image enhancement |
| 07/20/1994 | EP0606968A1 Multi-dimensional sound circuit |
| 06/28/1994 | US5325435 Sound field offset device |
| 06/14/1994 | CA1330200C Surround-sound system |
| 06/07/1994 | US5319713 Multi dimensional sound circuit |
| 04/28/1994 | WO1994009608A1 Adaptive rematrixing of matrixed audio signals |
| 04/26/1994 | US5307418 Center channel speaker having multiple interconnected backload amplifying chambers for surround sound stereo audio systems |
| 04/26/1994 | US5307415 Surround processor with antiphase blending and panorama control circuitry |
| 04/20/1994 | EP0593128A1 Deriving system for deriving a centre channel signal from a stereophonic audio signal |
| 04/05/1994 | US5301237 Surround sound loudspeakers |
| 03/22/1994 | US5297211 Acoustic device for custom installation |
| 03/22/1994 | US5297209 System for calibrating sound field |
| 03/15/1994 | US5295189 Control voltage generator for surround sound processor |
| 03/01/1994 | US5291557 Adaptive rematrixing of matrixed audio signals |
| 02/23/1994 | CN1082802A Hi-Fi sound system sound resonator without frequency divider |
| 01/26/1994 | EP0325650B1 Extended imaging split mode loudspeaker system |
| 01/20/1994 | WO1994001980A1 Transmission and storage of multi-channel audio-signals when using a bit rate-reducing coding process |
| 01/20/1994 | WO1993019542A3 Process for transmitting or storing digitalized, multi-channel audio signals |
| 01/18/1994 | US5280528 Band pass filter circuit for rear channel filtering in a surround processor |
| 01/13/1994 | DE4222623A1 Übertragung und Speicherung von mehrkanaligen Tonsignalen bei Anwendung von bitratenreduzierenden Codierverfahren Transmission and storage of multi-channel audio signals when using bitrate reducing coding |
| 12/28/1993 | US5274740 Decoder for variable number of channel presentation of multidimensional sound fields |
| 12/23/1993 | WO1993026134A1 Stereophonic sound reproduction device using several loudspeakers in each channel |
| 12/23/1993 | CA2137695A1 Strereophonic sound reproduction device using several loudspeakers in each channel |
| 12/09/1993 | WO1993025016A1 Dynamic loader |
| 12/01/1993 | EP0571638A1 Acoustic equipment and method of displaying operating thereof |