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| Number | Title | Issue Date |
| 7016501 | Directional decoding The degree of correlation between two audio signals is determined and the channels are normalized according to first and second normalization modes responsive to correlation and uncorrelation respectively. ... | 03/21/2006 |
| 6963646 | Sound signal encoding apparatus and method A sound signal encoding apparatus for encoding two different sound signals, comprising: compression level calculating means for calculating a compression level for each of the sound signal sections; compression level judging means for judging whether or not the calc... | 11/08/2005 |
| 6934394 | Universal four-channel surround sound speaker system for multimedia computer audio sub-systems A universal four-channel multimedia computer speaker system is connectable to audio sub-system control circuits (e.g., “sound cards”) of both the four-channel type and the conventional two-channel (stereo) type. With the audio sub-system control circuit being of... | 08/23/2005 |
| 6934395 | Surround sound field reproduction system and surround sound field reproduction method A surround sound field reproduction system and method is disclosed by which, in such a case that a listener changes its posture so that a portion of a video image to which attention should be paid may be observed in front of the listener, a sound image can be locali... | 08/23/2005 |
| 6813360 | Audio conferencing with three-dimensional audio encoding An apparatus and method for assigning each conferee to a conference a three-dimensional position with respect to a central listening position and the other conferees. Each conferees audio stream is encoded with the assigned three-dimensional position to produce an e... | 11/02/2004 |
| 6760448 | Compatible matrix-encoded surround-sound channels in a discrete digital sound format Three surround sound channels are provided within the current formats of the Dolby Digital, Sony SDDS and DTS digital soundtrack systems in a manner that provides compatibility with conventional two surround channel playback in standard 5.1 channel and 7.1 channel s... | 07/06/2004 |
| 6721425 | Sound signal mixing A method of down mixing a plurality of signals including at least a left surround signal, a right surround signal, a left signal and a right signal into a stereophonic pair that is a left transmitted signal and a right transmitted signal includes summing the left su... | 04/13/2004 |
| 6711266 | Surround sound channel encoding and decoding Surround sound encoding and decoding includes apparatus and techniques for encoding a number of major channels of a surround sound signal, such as left, right, center, left surround and right surround, into a lesser number of channels, such as left transmitted and r... | 03/23/2004 |
| 6691086 | Digital sub-band transmission system with transmission of an additional signal Reproduction accuracy of a digital signal, representing for example stereo audio signals, is improved by transmitting sample data which have been encoded to form transmission signals. The transmission signals are arranged in consecutive frames, each frame... | 02/10/2004 |
| 6665407 | Three channel panning system A technique for panning over four speakers utilizes an internal three-channel representation (Left, Right, W) where all channel weights are positive. The three channels are combined by a decoder to drive pairs of front and back speakers.... | 12/16/2003 |
| 6529604 | Scalable stereo audio encoding/decoding method and apparatus A scalable stereo audio encoding/decoding method and apparatus are provided. The method includes the steps of signal-processing input audio signals and quantizing the same for each predetermined coding band, coding the quantized data corresponding to the ... | 03/04/2003 |
| 6453047 | Matrix encoding system with improved behavior frequency A conveyor mat built up from hingedly intercoupled plastic modules, each module consisting of a number of substantially equally spaced apart hinge plates extending throughout the length of the module and provided with hinge loops at both ends thereof, the... | 09/17/2002 |
| 6446037 | Scalable coding method for high quality audio Scalable coding of audio into a core layer in response to a desired noise spectrum established according to psychoacoustic principles supports coding augmentation data into augmentation layers in response to various criteria including offset of such desir... | 09/03/2002 |
| 6341165 | Coding and decoding of audio signals by using intensity stereo and prediction processes In the coding and decoding of stereo audio spectral values both the intensity stereo process and prediction are used in order to achieve high data compression. If intensity stereo coding is active in one section of scale factor bands, the prediction for t... | 01/22/2002 |
| 6275589 | Method and apparatus for error masking in multi-channel audio signals For audio coding, the MPEG-2 standard provides for a spatial representation by multi-channel reproduction. In order to ensure backwards compatibility with MPEG-1 signals, the signals of the multi-channel sound channels are matrixed. Before being matrixed,... | 08/14/2001 |
| 6252965 | Multichannel spectral mapping audio apparatus and method A method and circuit for deriving a set of multichannel audio signals from a conventional monaural or stereo audio signal uses an auxiliary multichannel spectral mapping data stream. Audio can be played back in stereo and multichannel formats from a conve... | 06/26/2001 |
| 6198827 | 5-2-5 Matrix system A matrix system encodes five discrete audio signals down to a two-channel stereo recording and decodes the recorded stereo signal into at least five stand alone, independent channels to allow placement of specific sounds at any one of 5 or more predetermi... | 03/06/2001 |
| 6154545 | Method and apparatus for two channels of sound having directional cues The system and method of the present invention provides enhanced surround sound effects. In one embodiment, 90° phase shift and copy of the modified head related transfer functions (HRTF) are applied to each rear sound signal. The modified HRTF for each ... | 11/28/2000 |
| 6023490 | Encoding apparatus for encoding a plurality of information signals An apparatus for encoding a plurality of n digital information signals is provided with at least a first, second and third input terminal (1,2,3) for receiving a first, a second and a third digital information signal (L,R,C). A matrixing unit (10) is prov... | 02/08/2000 |
| 5910995 | DSP decoder for decoding analog SR encoded audio signals A decoder capable of decoding audio signals encoded using analog noise reduction techniques, particularly Dolby SR, is implemented by means of digital signal processing. The typical decoding paradigm used by analog Dolby SR decoders is modified to overcom... | 06/08/1999 |
| 5870480 | Multichannel active matrix encoder and decoder with maximum lateral separation A sound reproduction system for converting stereo signals on two input channels, which may have been directionally encoded from a four or five channel original using a phase/amplitude film matrix encoder, such signals including at least one component whic... | 02/09/1999 |
| 5857026 | Space-mapping sound system A sound system is disclosed which, in common with earlier phase-amplitude multichannel "matrix" encode-decode systems, conveys or stores audio programs having multidirectional sound-source localization in a pair of audio-bandwidth channels, whether analog... | 01/05/1999 |
| 5850456 | 7-channel transmission, compatible with 5-channel transmission and 2-channel transmission A 7-channel encoder and corresponding decoder is disclosed for encoding a 7-channel signal into a transmission signal which is backwards compatible, so that prior art MPEG-1 2-channel decoders are capable of decoding the transmission signal into a compati... | 12/15/1998 |
| 5812672 | Method for reducing data in the transmission and/or storage of digital signals of several dependent channels A method for reducing data during the transmission and/or storage of the digital signals of several dependent channels is described in which the dependence of the signals in the channels, e.g. in a left and a right stereo channel, can be used for an addit... | 09/22/1998 |
| 5802181 | Theater sound system with upper surround channels An improved theater surround sound system incorporates a screen top speaker and an overhead speaker driven by corresponding upper surround channels to more accurately reproduce sounds produced from above the listener. These top surround channels are encod... | 09/01/1998 |
| 5796844 | Multichannel active matrix sound reproduction with maximum lateral separation A sound reproduction system for converting stereo signals on two input channels, which may have been directionally encoded from a four or five channel original using a phase/amplitude film matrix encoder, such signals including at least one component whic... | 08/18/1998 |
| 5790500 | Apparatus for recording/reproducing converted four-channel audio signals A recording and reproducing system is arranged to record converted two-channel audio signals obtained by using all four-channel stereophonic audio signals and audio signals of two specific channels included in the four-channel stereophonic audio signals o... | 08/04/1998 |
| 5748746 | Ceiling speaker and signal source A system for controlling distribution of sound in a multi-channel sound system such as a "surround sound" system in a movie theater. Control signals are used to steer, or distribute, portions of the sound signal between designated speakers. In a preferred... | 05/05/1998 |
| 5701346 | Method of coding a plurality of audio signals In a method of coding a plurality of audio signals, the left and the right basic channel as well as the central channel are combined by joint stereo coding so as to obtain a jointly coded signal, which is decoded so as to provide simulated decoded signals... | 12/23/1997 |
| 5632005 | Encoder/decoder for multidimensional sound fields An adaptive high-fidelity perceptual subband encoder for spatially directional multichannel audio signals, using a mixture of individual-channel subband coding with subband-steered composite-channel signal coding that combines the spectral components of t... | 05/20/1997 |
| 5602923 | Theater sound system with upper surround channels An improved theater surround sound system incorporates a screen top speaker and an overhead speaker driven by corresponding upper surround channels to more accurately reproduce sounds produced from above the listener. These top surround channels are encod... | 02/11/1997 |
| 5590204 | Device for reproducing 2-channel sound field and method therefor A method of reproducing a sound field using digital signal processors in which 2-channel stereo signals are received and converted into 4-channel sound field signals through a first DSP and the 4-channel sound field signals are adaptively composed corresp... | 12/31/1996 |
| 5530655 | Digital sub-band transmission system with transmission of an additional signal A transmission channel may be utilized for a combination of wide-band signals and auxiliary signals, while still providing improved reproduction accuracy. Digital sub-signals or subband signals representing at least first and second data-reduced component... | 06/25/1996 |
| 5517570 | Sound reproducing array processor system A method and apparatus for dynamic, adaptive mapping of three-dimensional aural phenomenon to a two-dimensional sound reproducing surface. The surface is comprised of sound pixels that are discrete, addressable output locations. Actual or synthetic record... | 05/14/1996 |
| 5291557 | Adaptive rematrixing of matrixed audio signals In a system in which a low-bit rate encoder and decoder carries matrixed audio signals, an adaptive rematrix rematrixes matrixed signals from an unmodified 4:2 matrix encoder to separate and isolate quiet components from loud ones, thereby avoiding the co... | 03/01/1994 |
| 5278909 | System and method for stereo digital audio compression with co-channel steering Left right and surround components of a stereo signal are coded into a monaural and small co-channel providing volume steering for recreating a stereo effect with a substantially reduced bit rate. The signal is split into a sum and difference signal, the ... | 01/11/1994 |
| 4933768 | Sound reproducer A television receiver includes a volume control circuit (4) for controlling levels of sound signals corresponding to a left channel, a right channel, a center channel and a surround channel and speakers (6 to 10) corresponding to these channels. The telev... | 06/12/1990 |
| 4680796 | Sound encoding system A signal encoding system for generating at least two encoded signals in response to a plurality of information signals containing audio data representative of virtual images of sources of the data so that the encoded signals can be subsequently decoded by... | 07/14/1987 |
| 4251685 | Reproduction of sound In a sound reproduction system which enables the listener to distinguish between signals from in front and behind as well as signals on the left and the right, only two independent transmission channels are employed. The contributions to the signals in th... | 02/17/1981 |
| 4236039 | Signal matrixing for directional reproduction of sound Multidirectional sound signals are optimally matrixed to increase the psychoacoustic directional fidelity as compared with prior systems. Four (or more) azimuthally spaced loudspeakers are fed from two transmission channels with very satisfactory directio... | 11/25/1980 |
