Class 381/20 - Matrix

Subclass of Class 381 - Electrical audio signal processing systems and devices
Definition: Subject matter where the four independent sound signals
No. of applications: 24
Last issue date: 11/10/2011

Application No.	Application Title	Issue Date
20110274280	Method and System for Frequency Domain Active Matrix Decoding Without Feedback A perceptually motivated, frequency domain active matrix decoder and decoding method which decodes N audio input signals to generate M audio output signals, where M is greater than N, including by generating M streams of output frequency components which determine the a...	11/10/2011
20110166866	SIGNAL SYNTHESIZING A method of synthesizing a first (L) and a second (R) output signal from an input signal (x). The method comprises: filtering (201) the input signal to generate a filtered signal (H07/07/2011
20100177903	Hybrid Derivation of Surround Sound Audio Channels By Controllably Combining Ambience and Matrix-Decoded Signal Components Ambience signal components are obtained from source audio signals, matrix-decoded signal components are obtained from the source audio signals, and the ambience signal components are controllably combined with the matrix-decoded signal components. Obtaining ambience sig...	07/15/2010
20090316913	Spatial resolution of the sound field for multi-channel audio playback systems by deriving signals with high order angular terms Audio signals that represent a sound field with increased spatial resolution are obtained by deriving signals that represent the sound field with high-order angular terms. This is accomplished by analyzing input audio signals representing the sound field with zero-order...	12/24/2009
20090208023	AUDIO CHANNEL SPATIAL TRANSLATION Using an M:N variable matrix, M audio input signals, each associated with a direction, are translated to N audio output signals, each associated with a direction, wherein N is larger than M, M is two or more and N is a positive integer equal to three or more. The variab...	08/20/2009
20090086983	METHOD AND SYSTEM FOR TRANSMITTING AUDIO SIGNALS A system and method of transmitting audio signals. Frequency modulated carrier signals that each have an audio signal are mixed. The mixed signal is converted into a low voltage signal into which a feed voltage is coupled. The coupled signal is transmitted through a sin...	04/02/2009
20080097750	Channel reconfiguration with side information During production, at least one audio signal is processed in order to derive instructions for channel reconfiguring it. The at least one audio signal and the instructions are stored or transmitted. During consumption, the at least one audio signal is channel reconfigure...	04/24/2008
20080008327	Dynamic Decoding of Binaural Audio Signals Inputting of a parametrically encoded audio signal comprising at least one combined signal of a plurality of audio channels and one or more corresponding sets of side information describing a multi-channel sound image and including channel configuration information is s...	01/10/2008
20070291950	Acoustic Image Creation System and Program Therefor With stereophonic sound images of multi-channel audio signals well maintained, 2-channel system audio signals are created. An acoustic image creation system includes: a left-rear localization processing means 2 for outputting a left-rear localization signal by su...	12/20/2007
20070263877	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 conventional stereo ...	11/15/2007
20070211905	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 conventional stereo ...	09/13/2007
20070206814	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 conventional stereo ...	09/06/2007
20070206810	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 conventional stereo ...	09/06/2007
20070206812	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 conventional stereo ...	09/06/2007
20070206813	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 conventional stereo ...	09/06/2007
20070172070	Method and apparatus for audio matrix decoding An enhanced audio matrix decoding method and apparatus to generate a multi-channel audio signal from a stereo channel audio signal includes a front channel canceling unit to generate a surround channel audio signal through feed-forward mixing with a gain and delay, from...	07/26/2007
20070140498	Method and apparatus to provide active audio matrix decoding based on the positions of speakers and a listener An active audio matrix decoding method and apparatus to generate multi-channel audio signals from a stereo channel audio signal. The method includes extracting characteristics of a plurality of speaker signals and angles of each of a plurality of multi-channel speakers ...	06/21/2007
20070140497	METHOD AND APPARATUS TO PROVIDE ACTIVE AUDIO MATRIX DECODING An active audio matrix decoding method and apparatus to generate multi-channel audio signals from a stereo channel audio signal. The method includes: decoding a stereo channel audio signal into a multi-channel signal, extracting a power vector of each channel signal by ...	06/21/2007
20070110250	TRANSAURAL STEREO DEVICE A method of creating an impression of sound from an imaginary source to a listener. The method includes the step of determining an acoustic matrix for an actual set of speakers at an actual location relative to the listener and the step of determining an acoustic matrix...	05/17/2007
20070071247	Slot position coding of syntax of spatial audio application Spatial information associated with an audio signal is encoded into a bitstream, which can be transmitted to a decoder or recorded to a storage media. The bitstream can include different syntax related to time, frequency and spatial domains. In some embodiments, the bit...	03/29/2007
20060165237	Methods for improved performance of prediction based multi-channel reconstruction For a multi-channel reconstruction of audio signals based on at least one base channel, an energy measure is used for compensating energy losses due to an predictive upmix. The energy measure can be applied in the encoder or the decoder. Furthermore, a decorrelated sign...	07/27/2006
20060133618	Stereo compatible multi-channel audio coding A parametric representation of a multi-channel audio signal having parameters suited to be used together with a monophonic downmix signal to calculate a reconstruction of the multi-channel audio signal can efficiently be derived in a stereo-backwards compatible way when...	06/22/2006
20050276420	Audio channel spatial translation Using an M:N variable matrix, M audio input signals, each associated with a direction, are translated to N audio output signals, each associated with a direction, wherein N is larger than M, M is two or more and N is a positive integer equal to three or more. The variab...	12/15/2005
20050074127	Compatible multi-channel coding/decoding In processing a multi-channel audio signal having at least three original channels, a first downmix channel and a second downmix channel are provided, which are derived from the original channels. For a selected original channel of the original channels, channel side in...	04/07/2005

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Class 381/20 - Matrix