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Class 381/22 - Variable decoder


Subclass of Class 381 - Electrical audio signal processing systems and devices
Definition: Subject matter where the two more complex signals are combined
No. of patents: 179
Last issue date: 02/14/2012


1          
NumberTitleIssue Date
8116459Enhanced method for signal shaping in multi-channel audio reconstruction
The present invention is based on the finding that a reconstructed output channel, reconstructed with a multi-channel reconstructor using at least one downmix channel derived by downmixing a plurality of original channels and using a parameter representation includi...
02/14/2012
8111830Method 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 speak...
02/07/2012
8081763Efficient and scalable parametric stereo coding for low bitrate audio coding applications
The present invention provides improvements to prior art audio codecs that generate a stereo-illusion through post-processing of a received mono signal. These improvements are accomplished by extraction of stereo-image describing parameters at the encoder side, whic...
12/20/2011
8064608Audio decoding techniques for mid-side stereo
This disclosure describes decoding techniques for audio information encoded according to mid-side (MS) stereo encoding. The techniques involve a number of audio decoding tasks that are performed in a non-conventional order. By rearranging the order of the decoding t...
11/22/2011
8027479Binaural multi-channel decoder in the context of non-energy conserving upmix rules
A multi-channel decoder for generating a binaural signal from a downmix signal using upmix rule information on an energy-error introducing upmix rule for calculating a gain factor based on the upmix rule information and characteristics of head related transfer funct...
09/27/2011
8009837Multi-channel compatible stereo recording
An encoder for mixing a plurality of independent mono audio channels into a stereo recording and generating a restricted set of additional parameters used to master an audio track of a storage device is described. The plurality of independent mono audio channels are...
08/30/2011
8005229Method and an apparatus for decoding an audio signal
A method for processing an audio signal, comprising: receiving a downmix signal, an object information, and a mix information; generating a downmix processing information using the object information and the mix information; processing the downmix signal using the d...
08/23/2011
7986788Method and an apparatus for decoding an audio signal
A method for processing an audio signal, comprising: receiving a downmix signal, an object information, and a mix information; generating a downmix processing information using the object information and the mix information; processing the downmix signal using the d...
07/26/2011
7983424Envelope shaping of decorrelated signals
The envelope of a decorrelated signal derived from an original signal can be shaped without introducing additional distortion, when a spectral flattener is used to spectrally flatten the spectrum of the decorrelated signal and the original signal prior to using the ...
07/19/2011
7965848Reduced number of channels decoding
An intermediate channel representation of a multi-channel signal can be reconstructed highly efficient and with high fidelity, when upmix parameters for upmixing a transmitted downmix signal to the intermediate channel representation are derived that allow for an up...
06/21/2011
7961889Apparatus and method for processing multi-channel audio signal using space information
An apparatus for and a method of processing a multi-channel audio signal using space information. The apparatus includes: a main coding unit down mixing a multi-channel audio signal by applying space information to surround components included in the multi-channel a...
06/14/2011
7957538Method and apparatus to decode audio matrix
A method of audio matrix decoding in which a moving sound image is restored includes decoding multichannel signals from stereo signals, extracting strengths and positions of virtual sound sources existing between channels based on power vectors of the decoded multic...
06/07/2011
7945055Filter smoothing in multi-channel audio encoding and/or decoding
A first signal representation of one or more of the multiple channels is encoded in a first encoding process, and a second signal representation of one or more of the multiple channels is encoded in a second, filter-based encoding process. Filter smoothing can be us...
05/17/2011
7916873Stereo 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 ...
03/29/2011
7864964Multichannel 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 ste...
01/04/2011
7864965Multichannel 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 ste...
01/04/2011
7792304Multichannel 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 ste...
09/07/2010
7783050Method and an apparatus for decoding an audio signal
A method for processing an audio signal, comprising: receiving a downmix signal and a downmix processing information; and, processing the downmix signal using a downmix processing information, comprising: de-correlating the downmix signal; and, mixing the downmix si...
08/24/2010
7783051Method and an apparatus for decoding an audio signal
A method for processing an audio signal, comprising: receiving a downmix signal, an object information, and a mix information; generating a multi-channel information including at least one gain modification factor using the object information and the mix information...
08/24/2010
7783048Method and an apparatus for decoding an audio signal
A method for processing an audio signal, comprising: receiving a downmix signal, an object information, and a mix information; generating a downmix processing information using the object information and the mix information; processing the downmix signal using the d...
08/24/2010
7783049Method and an apparatus for decoding an audio signal
A method for processing an audio signal, comprising: receiving a downmix signal in time domain; if the downmix signal corresponds to a mono signal, bypassing the downmix signal; if the number of channel of the downmix signal corresponds to at least two, decomposing ...
08/24/2010
7773757Multichannel 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 ste...
08/10/2010
7720230Individual channel shaping for BCC schemes and the like
At an audio encoder, cue codes are generated for one or more audio channels, wherein an envelope cue code is generated by characterizing a temporal envelope in an audio channel. At an audio decoder, E transmitted audio channel(s) are decoded to generate C playback a...
05/18/2010
7715569Method and an apparatus for decoding an audio signal
A method for processing an audio signal, comprising: receiving a downmix signal, a first multi-channel information, and an object information; processing the downmix signal using the object information and a mix information; and, transmitting one of the first multi-...
05/11/2010
7668317Audio post processing in DVD, DTV and other audio visual products
The method and system of present invention sequences audio post-processing algorithms to simulate live or theater sound. An audio signal is selectively post-processed according to equipment availability and listener preferences. Downmixing or Prologic algorithms are...
02/23/2010
7613306Audio encoder and audio decoder
An audio encoder, generating a stereo signal based on a multi-channel signal, includes a downmix unit for downmixing a multi-channel signal exceeding two channels to a two-channel stereo signal, a first coding unit for generating a first coded signal by coding the d...
11/03/2009
7583804Music information encoding/decoding device and method
In an audio-information encoding apparatus, in order to encode an audio signal containing a white-noise component, an index iL indicating the energy level of the white-noise component and an index iR designating the start index of a random-number table are introduce...
09/01/2009
7437299Coding of stereo signals
A method of encoding a multichannel signal, such as a stereophonic audio signal, including at least first and second signal components includes transforming at least the first and second signal components by a predetermined transformation into a principal signal inc...
10/14/2008
7428308Transmitting and reproducing stereophonic audio signals
Apparatus and method for transmitting and reproducing stereophonic audio signals are disclosed. The method comprises splitting first and second channels into two frequency bands, combining the lower frequency band signals of the two channels, and transmitting the co...
09/23/2008
7391869Base management systems
Sound processing systems have been developed that create a surround effect without quality degradation experienced by known sound processing systems in non-optimum listening environments. The sound processing systems may include matrix decoding systems that manipula...
06/24/2008
73861325-2-5 matrix encoder and decoder system
A sound reproduction system has been developed, for converting signals on two input channels into surround signals on five or seven output channels and vice-versa. A decoder is included in the sound reproduction system which enhances the correlated component of the ...
06/10/2008
7382886Efficient and scalable parametric stereo coding for low bitrate audio coding applications
The present invention provides improvements to prior art audio codecs that generate a stereo-illusion through post-processing of a received mono signal. These improvements are accomplished by extraction of stereo-image describing parameters at the encoder side, whic...
06/03/2008
7382885Multi-channel audio reproduction apparatus and method for loudspeaker sound reproduction using position adjustable virtual sound images
A multi-channel audio reproduction apparatus and method for loudspeaker reproduction using virtual sound images whose positions can be adjusted is provided. The multi-channel audio reproduction apparatus includes a virtual sound image forming unit for compensating f...
06/03/2008
7333863Recording and playback control system
The invention is a system for recording and reading both program data and acoustical control data and playing back the data to optimize performance of audio reproduction and recreate the effect of an original acoustic environment. The system has a recording apparatu...
02/19/2008
7330555Coding device and method, and recording medium
An L-channel signal and an R-channel signal are input into a subtractor in which the difference between the L-channel signal and the R-channel signal is determined. The resulting signal is input into first and second multipliers. In the first multiplier, a mixed out...
02/12/2008
7330552Multiple positional channels from a conventional stereo signal pair
A method and system accept left and right channel inputs of audio data and provide output audio data for at least three channels in a fashion that may effect a facsimile of the original soundstage on which the left and right inputs were recorded. ...
02/12/2008
7330136Method and device to provide arithmetic decoding of scalable BSAC audio data
A method and device to arithmetically decode scalable bit sliced arithmetic coding (BSAC) audio data are provided. The arithmetic decoding method includes checking whether all side information of a last layer of the BSAC audio data is to be decoded, and performing B...
02/12/2008
7328161Audio decoding method and apparatus which recover high frequency component with small computation
A method and apparatus for performing audio post processing using mode information that indicates the degree of similarity between a right channel signal and a left channel signal in MPEG-1 layer 3 audio data, are provided. If the difference between the two c...
02/05/2008
7302067Audio system for a computer
A computer audio system includes an audio codec and a tone controller. The audio codec is operably coupled to receive audio information, which includes tone control settings, PCM digital audio inputs and PCM digital audio outputs. In addition, the audio codec may re...
11/27/2007
7292973System and method for deploying filters for processing signals
A system, method and computer-readable medium are disclosed for using filter signal processing. The system conveys filter information for a spectrum for a signal at a receiver. The system comprises a module configured to transmit information regarding a first filter...
11/06/2007
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