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Variable decoder

Subclass of:

381 - Electrical audio signal processing systems and devices

381001000 - BINAURAL AND STEREOPHONIC

381019000 - Quadrasonic

381020000 - Matrix

381021000 - 4-2-4

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DocumentTitleDate
20130028425Stereo Decoding System - A system for decoding a stereo multiplex signal, including one or more devices operable to convert the stereo multiplex signal into a sum signal (L+R) and a difference signal (L−R). The sum signal and the difference signal may be derived from a left stereo signal (L) and right stereo signal (R). The system may also be operable to determine a first transfer function H01-31-2013
20120201388APPARATUS AND METHOD FOR RESTORING MULTI-CHANNEL AUDIO SIGNAL USING HE-AAC DECODER AND MPEG SURROUND DECODER - Provided is a method for controlling synchronizing downmix signals and MPEG surround side information signals by controlling a delay according to the kind of downmix audio signals in an MPEG surround decoder. When multi-channel audio signals are restored using an HE-AAC decoder and a low-power MPEG surround decoder and complex QMF signals outputted from the HE-AAC decoder are used as downmix signals, a delay unit compensates for a delay caused in a real-to-complex converter. Anther delay unit delays spatial parameters to compensate for a delay caused in QMF and Nyquist banks when time-domain downmix signals are used. Also, when multi-channel audio signals are restored using an HE-AAC decoder and a high-quality MPEG surround decoder and complex QMF signals outputted from the HE-AAC decoder are used as downmix signals, a delay unit compensates for a delay caused in a real-to-complex converter.08-09-2012
20130028427SIGNAL PROCESSING APPARATUS AND SIGNAL PROCESSING METHOD, ENCODER AND ENCODING METHOD, DECODER AND DECODING METHOD, AND PROGRAM - The present invention relates to a signal processing apparatus and a signal processing method, an encoder and an encoding method, a decoder and a decoding method, and a program capable of reproducing music signal having a better sound quality by expansion of frequency band.01-31-2013
20130028426MDCT-Based Complex Prediction Stereo Coding - The invention provides methods and devices for stereo encoding and decoding using complex prediction in the frequency domain. In one embodiment, a decoding method, for obtaining an output stereo signal from an input stereo signal encoded by complex prediction coding and comprising first frequency-domain representations of two input channels, comprises the upmixing steps of: (i) computing a second frequency-domain representation of a first input channel; and (ii) computing an output channel on the basis of the first and second frequency-domain representations of the first input channel, the first frequency-domain representation of the second input channel and a complex prediction coefficient. The upmixing can be suspended responsive to control data.01-31-2013
20100080397AUDIO DECODING METHOD AND APPARATUS - A decoded sound analysis unit (04-01-2010
20100046761EFFICIENT 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, which are transmitted and subsequently used for control of a stereo generator at the decoder side. Furthermore, the invention bridges the gap between simple pseudo-stereo methods, and current methods of true stereo-coding, by using a new form of parametric stereo coding. A stereo-balance parameter is introduced, which enables more advanced stereo modes, and in addition forms the basis of a new method of stereo-coding of spectral envelopes, of particular use in systems where guided HFR (High Frequency Reconstruction) is employed. As a special case, the application of this stereo-coding scheme in scalable HFR-based codecs is described.02-25-2010
20100046760AUDIO ENCODING METHOD AND DEVICE - Audio encoding method and device comprising the transmission, in addition to the data representing a frequency-limited signal, of information relating to a temporal filter that is to be applied to the entire enhanced signal, both in its transmitted low-frequency part and in its reconstituted high-frequency part. The application of this filter for reshaping the reconstituted high-frequency part and the correction of compression artefacts present in the transmitted low-frequency part. In this way, the application of the temporal filter, simple and inexpensive, to all or part of the reconstituted signal, makes it possible to obtain a signal of good perceived quality.02-25-2010
20100046759METHOD AND APPARATUS FOR PROCESSING AN AUDIO SIGNAL - A method for processing an audio signal, comprising the steps of extracting an ancillary signal for generating the audio signal and an extension signal included in the ancillary signal from a received bit stream, checking a level of the bit stream, selectively decoding the extension signal according to the level of the bit stream, and generating the audio signal using the ancillary signal. Accordingly, in case of processing the audio signal by the present invention, it is able to reduce a corresponding load of operation to enable efficient processing and enhance a sound quality.02-25-2010
20130034232METHOD AND APPARATUS FOR DOWN-MIXING MULTI-CHANNEL AUDIO SIGNAL - A method of down-mixing a multi-channel audio signal is provided. The method including restoring sub-band Pulse Coded Modulation (PCM) samples for each channel of the multi-channel audio signal by decoding the multi-channel audio-signal and then dequantizing a sub-band coded multi-channel audio signal, scaling the restored sub-band PCM samples for each channel with a coefficient corresponding to a down-mixing configuration, generating sub-band PCM samples corresponding to predetermined channels by down-mixing the scaled sub-band PCM samples for each channel into the predetermined channels, and performing inverse sub-band filtering on the generated sub-band PCM samples corresponding to the predetermined channels.02-07-2013
20120263308APPARATUS, METHOD AND COMPUTER PROGRAM FOR PROVIDING ONE OR MORE ADJUSTED PARAMETERS FOR PROVISION OF AN UPMIX SIGNAL REPRESENTATION ON THE BASIS OF A DOWNMIX SIGNAL REPRESENTATION AND A PARAMETRIC SIDE INFORMATION ASSOCIATED WITH THE DOWNMIX SIGNAL REPRESENTATION, USING AN AVERAGE VALUE - An apparatus for providing one or more adjusted parameters for a provision of an upmix signal representation on the basis of a downmix signal representation and a parametric side information associated with the downmix signal representation has a parameter adjuster. The parameter adjuster is configured to receive one or more parameters and to provide, on the basis thereof, one or more adjusted parameters. The parameter adjuster is configured to provide the one or more adjusted parameters in dependence on an average value of a plurality of parameter values, such that a distortion of the upmix signal representation caused by the use of non-optimal parameters is reduced at least for parameters deviating from optimal parameters by more than a predetermined deviation.10-18-2012
20120183148SYSTEM FOR MULTICHANNEL MULTITRACK AUDIO AND AUDIO PROCESSING METHOD THEREOF - A multichannel multitrack audio system and an audio processing method are provided. The audio processing method down-mixes and encodes a first audio object constituting the audio from multiple channels to a lower number of channels. Thus, the method for down-mixing audio objects of the audio from the multichannel to the lower number of channels generates the multichannel multi-object audio and reproduces the generated multichannel multi-object audio. Abrupt data increase can be addressed in processing the multichannel multi-object audio.07-19-2012
20120213379APPARATUS FOR ENCODING/DECODING MULTICHANNEL SIGNAL AND METHOD THEREOF - Provided is an encoding/decoding apparatus and method of multi-channel signals. The encoding apparatus and method of multi-channel signals may encode phase information of the multi-channel signals using a quantization scheme and a lossless encoding scheme, and the decoding apparatus and method of multi-channel signals may decode the phase information using an inverse-quantization scheme and a lossless decoding scheme.08-23-2012
20130089209AUDIO-SIGNAL PROCESSING DEVICE, AUDIO-SIGNAL PROCESSING METHOD, PROGRAM, AND RECORDING MEDIUM - An audio-signal processing device includes a decoding unit that decodes a compressed audio stream to obtain audio signals for a predetermined number of channels; a signal processing unit that generates 2-channel audio signals including left-channel audio signals and right-channel audio signals, on the basis of the predetermined-number-of-channels audio signals; and a coefficient setting unit that sets filter coefficients corresponding to the impulse responses for the digital filters, on the basis of format information of the compressed audio stream. The signal processing unit uses digital filters to convolve impulse responses for paths from sound-source positions of the channels to the left and right ears of a listener with the corresponding predetermined-number-of-channels audio signals and adds corresponding results of the convolutions for the channels to generate the left-channel audio signals and the right-channel audio signals.04-11-2013
20130064377SIGNAL PROCESSING METHOD AND ENCODING AND DECODING APPARATUS - An encoding apparatus includes a down-mixing unit for down-mixing first and second input signals, and controlling a spatial parameter comprising or not comprising a first parameter which indicates a correlation between the first and second input signals to be transmitted to a decoding apparatus according to whether any one of the first and second input signals has a magnitude that is equal to or less than a predetermined threshold value; and a transmitting unit for transmitting the spatial parameter to the decoding apparatus.03-14-2013
20120237039AUDIO DECODER AND DECODING METHOD USING EFFICIENT DOWNMIXING - A method, an apparatus, a computer readable storage medium configured with instructions for carrying out a method, and logic encoded in one or more computer-readable tangible medium to carry out actions. The method is to decode audio data that includes N.n channels to M.m decoded audio channels, including unpacking metadata and unpacking and decoding frequency domain exponent and mantissa data; determining transform coefficients from the unpacked and decoded frequency domain exponent and mantissa data; inverse transforming the frequency domain data; and in the case M09-20-2012
20110096931CROSSTALK SUPPRESSION - A crosstalk suppression arrangement for a stereo audio system, wherein the stereo audio system comprises a left stereo channel and a right stereo channel, each comprising a driving circuit, an output impedance of the driving circuit comprising at least a first output impedance part, and a load impedance, and wherein the load impedances of the left and the right stereo channels are connected to a reference voltage via a common reference voltage impedance, the crosstalk suppression arrangement comprising: a crosstalk suppression impedance having an impedance value based on the reference voltage impedance, at least one of the load impedances and at least one of the output impedances, wherein the crosstalk suppression impedance is connected at one end to a point between the load impedance and the output impedance of the left stereo channel and at another end to a point between the load impedance and the output impedance of the right stereo channel.04-28-2011
20110293099System, medium and method of encoding/decoding multi-channel audio signals - An system, method, and method of encoding/decoding a multi-channel audio signal, including a decoding level generation unit producing decoding-level information that helps a bitstream including a number of audio channel signals and space information to be decoded into a number of audio channel signals, wherein the space information includes information about magnitude differences and/or similarities between channels, and an audio decoder decoding the bitstream according to the decoding-level information. Accordingly, even a single input bitstream can be decoded into a suitable number of channels depending on the type of a speaker configuration used. Scalable channel decoding can be achieved by partially decoding an input bitstream. In the scalable channel decoding, a decoder may set decoding levels and outputs audio channel signals according to the decoding levels, thereby reducing decoding complexity.12-01-2011
20120033819SIGNAL PROCESSING METHOD, ENCODING APPARATUS THEREFOR, DECODING APPARATUS THEREFOR, AND INFORMATION STORAGE MEDIUM - Provided are a signal processing method capable of inserting additional information into a bitstream without departing from the AC-3 standard or the Enhanced AC-3 standard. The signal processing method includes: extracting additional information which is for performing at least one of a channel number expansion of an audio signal in an encoding apparatus and a three-dimensional (3D) reproduction of the audio signal in the encoding apparatus; encoding the audio signal according to a predetermined standard; formatting the encoded audio signal into a bitstream including bitstream information, at least one audio block and an auxiliary data field; and inserting the additional information into at least one of additional bitstream information included in the bitstream information, a skip field included in the audio block and auxiliary data bits included in the auxiliary data field.02-09-2012
20110200196APPARATUS FOR DETERMINING A SPATIAL OUTPUT MULTI-CHANNEL AUDIO SIGNAL - An apparatus for determining a spatial output multi-channel audio signal based on an input audio signal and an input parameter. The apparatus includes a decomposer for decomposing the input audio signal based on the input parameter to obtain a first decomposed signal and a second decomposed signal different from each other. Furthermore, the apparatus includes a renderer for rendering the first decomposed signal to obtain a first rendered signal having a first semantic property and for rendering the second decomposed signal to obtain a second rendered signal having a second semantic property being different from the first semantic property. The apparatus comprises a processor for processing the first rendered signal and the second rendered signal to obtain the spatial output multi-channel audio signal.08-18-2011
20110200197Methods and Apparatuses for Encoding and Decoding Object-Based Audio Signals - An audio decoding method and apparatus and an audio encoding method and apparatus which can efficiently process object-based audio signals are provided. The audio decoding method includes receiving a downmix signal and object-based side information, the downmix signal comprising at least two downmix channel signals; extracting gain information from the object-based side information and generating modification information for modifying the downmix channel signals on a channel-by-channel basis based on the gain information; and modifying the downmix channel signals by applying the modification information to the downmix channel signals.08-18-2011
20120294448METHOD, MEDIUM, AND SYSTEM ENCODING/DECODING MULTI-CHANNEL SIGNAL - A multi-channel signal decoding method is provided. A down-mixed signal representative of a multi-channel signal is decoded, and parameters representing characteristic relations between channels of the multi-channel signal are decoded. An additional parameter is estimated by using the decoded parameters, and the decoded down-mixed signal is up-mixed by using the decoded parameters and the estimated parameter so as to decode the multi-channel signal.11-22-2012
20120294447APPARATUS AND METHOD FOR ENCODING/DECODING MULTICHANNEL SIGNAL - An apparatus and method for encoding/decoding a multi-channel signal may be provided. The apparatus of encoding a multi-channel signal may insert information about whether to encode a phase parameter indicating phase information of a plurality of channels, included in the multi-channel signal, in a bitstream of the multi-channel signal. The apparatus of decoding a multi-channel signal may determine whether to up-mix a mono signal using the phase parameter based on the information about whether to encode.11-22-2012
20120294449METHOD AND APPARATUS FOR CONTROL OF RANDERING MULTIOBJECT OR MULTICHANNEL AUDIO SIGNAL USING SPATIAL CUE - The present research relates to controlling rendering of multi-object or multi-channel audio signals. The present research provides a method and apparatus for controlling rendering of multi-object or multi-channel audio signals based on spatial cues in a process of decoding the multi-object or multi-channel audio signals. To achieve the purpose, the method suggested in the research controls rendering in a spatial cue domain in the process of decoding the multi-object or multi-channel audio signals.11-22-2012
20110268279AUDIO ENCODING DEVICE, DECODING DEVICE, METHOD, CIRCUIT, AND PROGRAM - Provided is an encoding device (11-03-2011
20110268280AUDIO SIGNAL DECODING DEVICE AND METHOD OF BALANCE ADJUSTMENT - Disclosed is an audio signal decoding device and a method of balance adjustment that reduces a fluctuation of a decoded signal orientation and maintains a stereo perception. An interchannel correlation computation unit (11-03-2011
20090129603METHOD 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 multichannel signals, comparing the strengths and positions of the extracted previous and current virtual sound sources to predict position movement and the strengths of the virtual sound sources, and redistributing powers to positions of channel speakers in a multichannel arrangement based on the predicted position of a sound image.05-21-2009
20120070007APPARATUS AND METHOD FOR BANDWIDTH EXTENSION FOR MULTI-CHANNEL AUDIO - A method and apparatus of effectively encoding and decoding a high-frequency signal of a multi-channel audio are provided. A multi-channel audio decoding apparatus may down-mix a multi-channel audio input signal, expand a number of channels of the down-mixed signal, select at least one of the expanded channel signal, extract a parameter indicating a characteristic relation between the selected signal and the multi-channel audio input signal, and encode the down-mixed signal and the extracted parameter.03-22-2012
20110142245Output control apparatus, output controlling method, program, and output control system - Provided is an output control apparatus connected to an audio output apparatus controlling output of audio data, including: a receiving unit configured to receive encoded data obtained by encoding multi-channel audio data; a decoding unit configured to decode the encoded data; an output control unit configured to control output of a predetermined number of channels of audio data among the multi-channel audio data obtained by the decoding; a transmitting unit configured to transmit any one of audio data different from the audio data of which the output is controlled by the output control unit among the multi-channel audio data obtained by the decoding and the encoded data to an audio output apparatus connected through an integrated cable formed by integrating at least a video line, an audio line, and a control line; and a control unit configured to control the audio output apparatus through the integrated cable.06-16-2011
20110103592Apparatus and method encoding/decoding with phase information and residual information - Provided is an apparatus and method of encoding and decoding multiple channel signals based upon phase information and one or more residual signals.05-05-2011
20110058679Method, Device, Encoder Apparatus, Decoder Apparatus and Audio System - A method and a device are described for processing a stereo signal obtained from an encoder, which encodes an N-channel audio signal into spatial parameters (P) and a stereo down-mix comprising first and second stereo signals (L03-10-2011
20100310081Multi-channel Audio Signal Decoding Method and Device - A multi-channel audio signal decoding method and device is provided. The multi-channel audio signal decoding method includes receiving a first multi-channel audio signal; performing a first decoding procedure on the first multi-channel audio signal to generate a second multi-channel audio signal; performing a second decoding procedure on a first single-channel audio data of the second multi-channel audio signal to generate a first single-channel audio signal when the first single-channel audio data belongs to a first classification; and performing a third decoding procedure on a second single-channel audio data of the second multi-channel audio signal to generate a second single-channel audio signal when the second single-channel audio data belongs to a second classification. The number of instructions of the third decoding procedure is less than that of the second decoding procedure.12-09-2010
20100322429Joint Enhancement of Multi-Channel Audio - An overall encoding procedure and associated decoding procedure are presented. The encoding procedure involves at least two signal encoding processes operating on signal representations of a set of audio input channels. Local synthesis is used in connection with a first encoding process to generate a locally decoded signal, including a representation of the encoding error of the first encoding process. This locally decoded signal is applied as input to a second encoding process. The overall encoding procedure generates at least two residual encoding error signals from at least one of said encoding processes, including at least said second encoding process. The residual error signals are then subjected to compound residual encoding in a further encoding process, preferably based on correlation between the residual error signals.12-23-2010
20110044457APPARATUS AND METHOD FOR RESTORING MULTI-CHANNEL AUDIO SIGNAL USING HE-AAC DECODER AND MPEG SURROUND DECODER - Provided is a method for controlling synchronizing downmix signals and MPEG surround side information signals by controlling a delay according to the kind of downmix audio signals in an MPEG surround decoder. When multi-channel audio signals are restored using an HE-AAC decoder and a low-power MPEG surround decoder and complex QMF signals outputted from the HE-AAC decoder are used as downmix signals, a delay unit compensates for a delay caused in a real-to-complex converter. Anther delay unit delays spatial parameters to compensate for a delay caused in QMF and Nyquist banks when time-domain downmix signals are used. Also, when multi-channel audio signals are restored using an HE-AAC decoder and a high-quality MPEG surround decoder and complex QMF signals outputted from the HE-AAC decoder are used as downmix signals, a delay unit compensates for a delay caused in a real-to-complex converter.02-24-2011
20110044459SLOT 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 bitstream includes one or more data structures (e.g., frames) that contain ordered sets of slots for which parameters can be applied. The data structures can be fixed or variable. The data structure can include position information that can be used by a decoder to identify the correct slot for which a given parameter set is applied. The slot position information can be encoded with either a fixed number of bits or a variable number of bits based on the data structure type.02-24-2011
20120243690APPARATUS FOR PROVIDING AN UPMIX SIGNAL REPRESENTATION ON THE BASIS OF A DOWNMIX SIGNAL REPRESENTATION, APPARATUS FOR PROVIDING A BITSTREAM REPRESENTING A MULTI-CHANNEL AUDIO SIGNAL, METHODS, COMPUTER PROGRAM AND BITSTREAM USING A DISTORTION CONTROL SIGNALING - An apparatus for providing an upmix signal representation on the basis of a downmix signal representation and an object-related parametric information, which are included in a bitstream representation of an audio content, and in dependence on a rendering information, has a distortion limiter configured to adjust upmix parameters using a distortion control scheme to avoid or limit audible distortions which are caused by an inappropriate choice of rendering parameters. The distortion limiter is configured to obtain a distortion limitation control parameter, which is included in the bitstream representation of the audio content, and to adjust a distortion control scheme in dependence on the distortion limitation control parameter.09-27-2012
20110211703Stereo 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 a parameter combiner is used to generate the parametric representation by combining a one or more spatial parameters and a stereo parameter resulting in a parametric representation having a decoder usable stereo parameter and an information on the one or more spatial parameters that represents, together with the decoder usable stereo parameter, the one or more spatial parameters.09-01-2011
20120230497SYSTEM FOR DYNAMICALLY CREATING AND RENDERING AUDIO OBJECTS - Embodiments of systems and methods are described for providing backwards compatibility for legacy devices that are unable to natively render non-channel based audio objects. These systems and methods can also be beneficially used to produce a reduced set of audio objects for compatible object-based decoders with low computing resources.09-13-2012
20120243692Decoding of Multichannel Audio Encoded Bit Streams Using Adaptive Hybrid Transformation - The processing efficiency of a process used to decode frames of an enhanced AC-3 bit stream is improved by processing each audio block in a frame only once. Audio blocks of encoded data are decoded in block order rather than in channel order. Exemplary decoding processes for enhanced bit stream coding features such as adaptive hybrid transform processing and spectral extension are disclosed.09-27-2012
20110249822ADVANCED ENCODING OF MULTI-CHANNEL DIGITAL AUDIO SIGNALS - A method is provided for coding a multi-channel audio signal representing a sound scene comprising a plurality of sound sources. The method comprises decomposing the multi-channel signal into frequency bands and the following performed per frequency band: obtaining data representative of the direction of the sound sources of the sound scene, selecting a set of sound sources constituting principal sources, adapting the data representative of the direction of the selected principal sources, as a function of restitution characteristics of the multi-channel signal, determining a matrix for mixing the principal sources as a function of the adapted data, matrixing the principal sources by the matrix determined so as to obtain a sum signal with a reduced number of channels and coding the data representative of the direction of the sound sources and forming a binary stream comprising the coded data, the binary stream being transmittable in parallel with the sum signal.10-13-2011
20110044458SLOT POSITION CODING OF RESIDUAL SIGNALS OF SPATIAL AUDIO CODING 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 bitstream includes one or more data structures (e.g., frames) that contain ordered sets of slots for which parameters can be applied. The data structures can be fixed or variable. The data structure can include position information that can be used by a decoder to identify the correct slot for which a given parameter set is applied. The slot position information can be encoded with either a fixed number of bits or a variable number of bits based on the data structure type.02-24-2011
20110249821 ENCODING OF MULTICHANNEL DIGITAL AUDIO SIGNALS - A method for coding a multi-channel audio signal representing a sound scene comprising a plurality of sound sources is provided. This method comprises decomposing the multi-channel signal into frequency bands and, per frequency band, obtaining directivity information per sound source of the sound scene, the information being representative of the spatial distribution of the sound source in the sound scene, of selecting a set of sound sources of the sound scene constituting principal sources, of matrixing the selected principal sources to obtain a sum signal with a reduced number of channels and, of coding the directivity information and of forming a binary stream comprising the coded directivity information, the binary stream being transmittable in parallel with the sum signal. A decoding method is also provided that is able to decode the sum signal and the directivity information to obtain a multi-channel signal, to an adapted coder and an adapted decoder.10-13-2011
20120275609MULTI-OBJECT AUDIO ENCODING AND DECODING METHOD AND APPARATUS THEREOF - Provided are a multi-object audio encoding and decoding method and an apparatus thereof. The multi-object encoding method includes generating a down-mix signal and a residual signal by down-mixing a foreground audio object and a background audio object, and generating a bitstream including the down-mix signal and the residual signal.11-01-2012
20090016539A/V AMPLIFIER AND METHOD FOR DRIVING THE SAME - For achieving an audio reproduction with high sound quality, in a multi-channel A/V amplifier, front speakers are driven with a parallel-drive bi-amplifier arrangement upon stereo reproduction. In the case of the multi-channel reproduction mode, the switching circuit allows an output signal of each channel of the decoder to be sent to speakers via amplifiers for each channel in one-to-one correspondence. On the other hand, in the case of the 2-channel stereo reproduction mode, the switching circuit allows at least two amplifiers among the plurality of amplifiers to be connected in parallel between the output signal for each of the channels L and R of the decoder and the speakers for each of the channels L and R, and also allows the timing of the output signals of the respective amplifiers to be varied.01-15-2009
20110164756Cue-Based Audio Coding/Decoding - Generic and specific C-to-E binaural cue coding (BCC) schemes are described, including those in which one or more of the input channels are transmitted as unmodified channels that are not downmixed at the BCC encoder and not upmixed at the BCC decoder. The specific BCC schemes described include 5-to-2, 6-to-5, 7-to-5, 6.1-to-5.1, 7.1-to-5.1, and 6.2-to-5.1, where “.1” indicates a single low-frequency effects (LFE) channel and “.2” indicates two LFE channels.07-07-2011
20100329467REMOVING TIME DELAYS IN SIGNAL PATHS - The disclosed embodiments include systems, methods, apparatuses, and computer-readable mediums for compensating one or more signals and/or one or more parameters for time delays in one or more signal processing paths.12-30-2010
20100329466DEVICE AND METHOD FOR CONVERTING SPATIAL AUDIO SIGNAL - An audio processor for converting a multi-channel audio input signal, such as a B-format sound field signal, into a set of audio output signals, such as a set of two or more audio output signals arranged for headphone reproduction or for playback over an array of loudspeakers. A filter bank splits each of the input channels into frequency bands. The input signal is decomposed into plane waves to determine one or two dominant sound source directions. The(se) are used to determine a set of virtual loudspeaker positions selected such that the dominant direction(s) coincide(s) with virtual loudspeaker positions. The input signal is decoded into virtual loudspeaker signals corresponding to each of the virtual loudspeaker positions, and the virtual loudspeaker signals are processed with transfer functions suitable to create the illusion of sound emanating from the directions of the virtual loudspeakers. A high spatial fidelity is obtained due to the coincidence of virtual loudspeaker positions and the determined dominant sound source direction(s). Improved performance can be obtained in the case where Head-Related Transfer Functions are used by differentiating the phase of a high frequency part of the HRTFs with respect to frequency, followed by a corresponding integration of this part with respect to frequency after combining the components of HRTFs from different directions.12-30-2010
20110261969BIPHASE MARK CODE DECODER AND METHOD OF OPERATION - Biphase mark codes (BMC) are used in digital communications. Most BMC formats use preambles for rate determination and synchronization. A decoder compares the intervals of continuous high or continuous low voltages in a BMC stream to predetermined minimum and maximum values of half cell, full cell and one-and-a-half cell intervals for all supported sampling rates. If a pattern matching a preamble is found, the sampling rate is locked in and the decoder is synchronized to the BMC stream. Once locked, the decoder uses the predetermined minimum and maximum values at the locked rate to generate half cell, full cell and one-and-a-half cell indicators for a decoding state machine which decodes data in the BMC stream or decodes expected preambles.10-27-2011
20110096932PARAMETRIC STEREO UPMIX APPARATUS, A PARAMETRIC STEREO DECODER, A PARAMETRIC STEREO DOWNMIX APPARATUS, A PARAMETRIC STEREO ENCODER - A parametric stereo upmix apparatus (04-28-2011
20110051940DECODING DEVICE, CODING AND DECODING DEVICE, AND DECODING METHOD - There was no method of positioning virtual sound sources of object signals obtained from received coded object information, in a listening space on a receiving site side. Provided are an object decoding unit (03-03-2011
20110051939METHOD AND APPARATUS FOR ENCODING AND DECODING STEREO AUDIO - A method of encoding stereo audio that minimizes a number of pieces of side information required for parametric-encoding and parametric-decoding of the stereo audio. The side information may include parameters about interchannel intensity difference (IID), interchannel correlation (IC), overall phase difference (OPD), and interchannel phase difference (IPD), which are required to restore the mono audio to the stereo audio.03-03-2011
20110051938METHOD AND APPARATUS FOR ENCODING AND DECODING STEREO AUDIO - A method of encoding stereo audio that minimizes a number of pieces of side information required for parametric-encoding and parametric-decoding of the stereo audio. The side information may include parameters about interchannel intensity difference (IID), interchannel correlation (IC), overall phase difference (OPD), and interchannel phase difference (IPD), which are required to restore the mono audio to the stereo audio.03-03-2011
20110085670TIME SLOT POSITION CODING OF MULTIPLE FRAME TYPES - 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 bitstream includes one or more data structures (e.g., frames) that contain ordered sets of slots for which parameters can be applied. The data structures can be fixed or variable. The data structure can include position information that can be used by a decoder to identify the correct slot for which a given parameter set is applied. The slot position information can be encoded with either a fixed number of bits or a variable number of bits based on the data structure type.04-14-2011
20120308018STEREO SIGNAL DOWN-MIXING METHOD, ENCODING/DECODING APPARATUS AND ENCODING AND DECODING SYSTEM - Embodiments of the present invention provide a stereo signal down-mixing method, encoding/decoding apparatus and system. The down-mixing method includes: converting a first channel time-domain signal and a second channel time-domain signal into a first channel frequency-domain signal and a second channel frequency-domain signal; obtaining a frequency-domain channel signal level difference and a frequency-domain channel signal phase difference between the two channel frequency-domain signals; for each frequency bin in each frequency band, using a function based on the frequency-domain channel signal level difference and frequency-domain channel signal phase difference to obtain a down-mixed signal phase that is located between phases of the two channel frequency-domain signals, and obtaining a down-mixed signal amplitude through calculation; and obtaining a frequency-domain down-mixed signal according to the phase and amplitude.12-06-2012
20120308016MATRIX ENCODER WITH IMPROVED CHANNEL SEPARATION - An encoder and encoding method for use in a surround sound system wherein at least four audio input signals representing an original sound field are encoded into two channel signals and the encoded two channel signals are decoded into at least four audio output signals corresponding to the four audio input signals. The encoder includes matrix structure connected to receive the four audio input signals for encoding the four input signals into two channel output signals. The matrix structure is responsive to the four input signals for producing L and R output signals as follows: 12-06-2012
20120308017METHOD, APPARATUS, AND SYSTEM FOR ENCODING AND DECODING MULTI-CHANNEL SIGNALS - A method, an apparatus, and a system for encoding and decoding multi-channel signals are disclosed. The method for encoding multi-channel signals includes: determining the category of an index corresponding to a channel level difference (CLD) which needs to be quantized in a current frame; quantizing the CLD of at least one frequency band whose index category is the same as the determined category of the index in the current frame, and obtaining quantized data.12-06-2012
20110305343Method and system decoding audio data with selective power control - Provided is an audio data decoding system and method that may selectively transfer compressed audio data from a top system to at least one audio input buffer of a separately provided and/or separately power management controlled subsystem, restore the compressed audio data to digital pulse code modulation (PCM) data using an audio decoding unit of the subsystem, convert the digital PCM data to analog PCM data or an audio output signal, and output the converted audio output signal.12-15-2011
20110305344METHOD AND APPARATUS FOR THREE-DIMENSIONAL ACOUSTIC FIELD ENCODING AND OPTIMAL RECONSTRUCTION - A method and apparatus to encode audio with spatial information in a manner that does not depend on the exhibition setup, and to decode and play out optimally for any given exhibition setup, maximizing the sweet-spot area, and including setups with loudspeakers at different heights, and headphones. The part of the audio that requires very precise localization is encoded into a set of mono tracks with associated directional parameters, whereas the remaining audio is encoded into a set of Ambisonics tracks of a chosen order and mixture. Upon specification of a given exhibition system, the exhibition-independent format is decoded adapting to the specified system, by using different decoding methods for each assigned group.12-15-2011
20120039477AUDIO SIGNAL SYNTHESIZING - An audio synthesizing apparatus receives an encoded signal comprising a downmix signal and parametric extension data for expanding the downmix signal to a multi-sound source signal. A decomposition processor (02-16-2012
20130010971METHOD AND DEVICE FOR DECODING AN AUDIO SOUNDFIELD REPRESENTATION FOR AUDIO PLAYBACK - Soundfield signals such as e.g. Ambisonics carry a representation of a desired sound field. The Ambisonics format is based on spherical harmonic decomposition of the soundfield, and Higher Order Ambisonics uses spherical harmonics of at least 201-10-2013
20110091046BINAURAL 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 function based filters corresponding to upmix channels. The one or more gain factors are used by a filter processor for filtering the downmix signal so that an energy corrected binaural signal having a left binaural channel and a right binaural channel is obtained.04-21-2011
20110091045Audio Encoding and Decoding - An audio encoder (04-21-2011
20110317842APPARATUS, METHOD AND COMPUTER PROGRAM FOR UPMIXING A DOWNMIX AUDIO SIGNAL - An apparatus for upmixing a downmix audio signal describing one or more downmix audio channels into an upmixed audio signal describing a plurality of upmixed audio channels includes an upmixer configured to apply temporally variable upmixing parameters to upmix the downmix audio signal in order to obtain the upmixed audio signal. The apparatus also includes a parameter interpolator, wherein the parameter interpolator is configured to obtain one or more temporally interpolated upmix parameters to be used by the upmixer on the basis of a first complex-valued upmix parameter and a subsequent second complex-valued upmix parameter. The parameter interpolator is configured to separately interpolate between a magnitude value of the first complex-valued upmix parameter and a magnitude value of the second complex-valued upmix parameter, and between a phase value of the first complex-valued upmix parameter and a phase value of the second complex-valued upmix parameter, to obtain the one or more temporally interpolated upmix parameters. A respective method can be implemented, for example, as a computer program.12-29-2011
20120045067ENCODING DEVICE, DECODING DEVICE, AND METHODS THEREFOR - Disclosed are a encoding device, a decoding device, and encoding and decoding methods, wherein when a multi-channel signal is encoded with high efficiency, using an adaptive filter, the number of arithmetic operations to update a filter coefficient of the adaptive filter can be reduced. An update range determination unit (02-23-2012
20120002818Advanced Stereo Coding Based on a Combination of Adaptively Selectable Left/Right or Mid/Side Stereo Coding and of Parametric Stereo Coding - The application relates to audio encoder and decoder systems. An embodiment of the encoder system comprises a downmix stage for generating a downmix signal and a residual signal based on a stereo signal. In addition, the encoder system comprises a parameter determining stage for determining parametric stereo parameters such as an inter-channel intensity difference and an inter-channel cross-correlation. Preferably, the parametric stereo parameters are time- and frequency-variant. Moreover, the encoder system comprises a transform stage. The transform stage generates a pseudo left/right stereo signal by performing a transform based on the downmix signal and the residual signal. The pseudo stereo signal is processed by a perceptual stereo encoder. For stereo encoding, left/right encoding or mid/side encoding is selectable. Preferably, the selection between left/right stereo encoding and mid/side stereo encoding is time- and frequency-variant.01-05-2012
20120207311OPTIMIZED LOW-BIT RATE PARAMETRIC CODING/DECODING - A parametric coding method and apparatus are provided for coding a multichannel digital audio signal. The method includes a coding step for coding a signal from a channel reduction matrixing of the multichannel signal. The coding method also includes: obtaining, for each frame of predetermined length, spatial information parameters of the multichannel signal; dividing the spatial information parameters into a plurality of blocks of parameters; selecting a block of parameters as a function of the index of the current frame; and coding the block of parameters selected for the current frame.08-16-2012
20120057710APPARATUS FOR DETERMINING A SPATIAL OUTPUT MULTI-CHANNEL AUDIO SIGNAL - An apparatus for determining a spatial output multi-channel audio signal based on an input audio signal and an input parameter. The apparatus includes a decomposer for decomposing the input audio signal based on the input parameter to obtain a first decomposed signal and a second decomposed signal different from each other. Furthermore, the apparatus includes a renderer for rendering the first decomposed signal to obtain a first rendered signal having a first semantic property and for rendering the second decomposed signal to obtain a second rendered signal having a second semantic property being different from the first semantic property. The apparatus comprises a processor for processing the first rendered signal and the second rendered signal to obtain the spatial output multi-channel audio signal.03-08-2012
20120063604SCALABLE MULTI-CHANNEL AUDIO CODING - An audio encoder adapted to encode a multi-channel audio signal. The encoder comprises an encoder combination module (ECM) for generating a dominant signal part and a residual signal part being a combined representation of first and second audio signals, the dominant and residual signal parts being obtained by applying a mathematical procedure to the first and second audio signals. The mathematical procedure involves a spatial parameter comprising a description of spatial properties of the first and second audio signals. Embodiments include a plurality of interconnected encoder combination module, so that e.g. six independent 5.1 format audio signals can be encoded to a single or two dominant signal parts and a number of parameter sets and residual signal parts.03-15-2012
20120155653METHOD AND APPARATUS FOR ENCODING AND DECODING SUCCESSIVE FRAMES OF AN AMBISONICS REPRESENTATION OF A 2- OR 3-DIMENSIONAL SOUND FIELD - Representations of spatial audio scenes using higher-order Ambisonics HOA technology typically require a large number of coefficients per time instant. This data rate is too high for most practical applications that require real-time transmission of audio signals. According to the invention, the compression is carried out in spatial domain instead of HOA domain. The (N+1)06-21-2012
20120314874TWO-WIRE DIGITAL AUDIO INTERFACE - A digital audio interface may include two signal inputs to transmit audio data. A first signal line may carry digital serial audio data. The second signal line may carry a word clock signal to differentiate the serial audio data transmitted over the first signal line. In the case of stereo audio data, the word clock signal may correspond to a left-right clock signal and may differentiate audio data intended for a right channel from that intended for a left channel. The audio data may also be differentiated differently depending on the configuration, such as in the case that the transmitted audio data include audio for more than two channels. The word clock signal may be scaled to regenerate a bit clock signal used to encode the serial audio data over the first signal line. The encoding bit clock signal need not be transmitted.12-13-2012
20120163607MATRIX DECODER FOR SURROUND SOUND - A decoder and decoding method for use in surround sound system wherein at least four audio input signals representing an original sound field are encoded into two channel signals and said encoded signals are decoded into at least four audio output signals corresponding to the four audio input signals and have an amplitude ratio and a phase relationship. The decoder and method including means for: compensating the said encoded signals for variations in perceived loudness relative to frequency associated with the encoded two channel signals due to non linearity in human hearing response at least at some frequencies; producing steering signals in responsive to the phase relationship of the said compensated signals; decoding said encoded signals to produce audio output signals corresponding to audio input signals by varying at least the amplitude ratio of said encoded signals contained in each of the output signals in response to said steering signals.06-28-2012
20120163606Method and Apparatus for Processing Audio Signals - An apparatus (06-28-2012
20120128162MIXED LOSSLESS AUDIO COMPRESSION - A mixed lossless audio compression has application to a unified lossy and lossless audio compression scheme that combines lossy and lossless audio compression within a same audio signal. The mixed lossless compression codes a transition frame between lossy and lossless coding frames to produce seamless transitions. The mixed lossless coding performs a lapped transform and inverse lapped transform to produce an appropriately windowed and folded pseudo-time domain frame, which can then be losslessly coded. The mixed lossless coding also can be applied for frames that exhibit poor lossy compression performance.05-24-2012
20110182433DECODING APPARATUS, DECODING METHOD, ENCODING APPARATUS, ENCODING METHOD, AND EDITING APPARATUS - A decoding apparatus (07-28-2011
20110182432CODING APPARATUS AND DECODING APPARATUS - A coding apparatus which suppresses an extreme increase in a bit rate, includes: a downmixing and coding unit (07-28-2011
20120213377EFFICIENT 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, which are transmitted and subsequently used for control of a stereo generator at the decoder side. Furthermore, the invention bridges the gap between simple pseudo-stereo methods, and current methods of true stereo-coding, by using a new form of parametric stereo coding. A stereo-balance parameter is introduced, which enables more advanced stereo modes, and in addition forms the basis of a new method of stereo-coding of spectral envelopes, of particular use in systems where guided HFR (High Frequency Reconstruction) is employed. As a special case, the application of this stereo-coding scheme in scalable HFR-based codecs is described.08-23-2012
20120213378Spectral Translation/Folding in the Subband Domain - The present invention relates to a new method and apparatus for improvement of High Frequency Reconstruction (HFR) techniques using frequency translation or folding or a combination thereof. The proposed invention is applicable to audio source coding systems. This is accomplished by means of frequency translation in the frequency domain with spectral envelope adjustment in the same domain. The proposed invention offers a low-complexity HFR method useful in speech and natural audio coding applications.08-23-2012
20120314875METHOD AND APPARATUS FOR ENCODING AND DECODING 3-DIMENSIONAL AUDIO SIGNAL - A method of encoding a multi-channel 3-dimensional (3D) audio signal mixed with a multi-channel 3D object signal is provided. The method includes: obtaining a location parameter indicating a virtual location of the multi-channel 3D object signal on a multi-channel speaker layout based on a gain value of the multi-channel 3D object signal for each channel; and encoding the multi-channel 3D audio signal and the location parameter.12-13-2012
20120213376AUDIO DECODER, AUDIO OBJECT ENCODER, METHOD FOR DECODING A MULTI-AUDIO-OBJECT SIGNAL, MULTI-AUDIO-OBJECT ENCODING METHOD, AND NON-TRANSITORY COMPUTER-READABLE MEDIUM THEREFOR - An audio decoder for decoding a multi-audio-object signal having an audio signal of a first type and an audio signal of a second type encoded therein is described, the multi-audio-object signal having a downmix signal and side information, the side information having level information of the audio signals of the first and second types in a first predetermined time/frequency resolution, and a residual signal specifying residual level values in a second predetermined time/frequency resolution, the audio decoder having a processor for computing prediction coefficients based on the level information; and an up-mixer for up-mixing the downmix signal based on the prediction coefficients and the residual signal to obtain a first up-mix audio signal approximating the audio signal of the first type and/or a second up-mix audio signal approximating the audio signal of the second type.08-23-2012
20120076309MULTI-CHANNEL DECODING SYSTEMS CAPABLE OF REDUCING NOISE AND METHODS THEREOF - A multi-channel decoding method includes: receiving an input signal to generate a channel output signal; providing a first test signal serving as the input signal in a first calibration mode; and adjusting a DC voltage level of the channel output signal with a first calibration signal by reducing a difference between a first predetermined reference signal level and a DC voltage level of the channel output signal generated from the first test signal.03-29-2012
20120076308ACOUSTIC ECHO SUPPRESSION UNIT AND CONFERENCING FRONT-END - An acoustic echo suppression unit according to an embodiment of the present invention includes and input interface for extracting a downmix signal from an input signal, the input signal including the downmix signal and parametric side information, wherein the downmix and the parametric side information together represent a multichannel signal, a calculator for calculating filter coefficients for an adaptive filter, wherein the calculator is adapted to determine the filter coefficients based on the downmix signal and a microphone signal or a signal derived from the microphone signal, and an adaptive filter adapted to filter the microphone signal or the signal derived from the microphone signal based on the filter coefficients to suppress an echo caused by the multichannel signal in the microphone signal.03-29-2012
20120314876APPARATUS AND METHOD FOR EXTRACTING A DIRECT/AMBIENCE SIGNAL FROM A DOWNMIX SIGNAL AND SPATIAL PARAMETRIC INFORMATION - An apparatus for extracting a direct and/or ambience signal from a downmix signal and spatial parametric information, the downmix signal and the spatial parametric information representing a multi-channel audio signal having more channels than the downmix signal, wherein the spatial parametric information has inter-channel relations of the multi-channel audio signal, is described. The apparatus has a direct/ambience estimator and a direct/ambience extractor. The direct/ambience estimator is configured for estimating a level information of a direct portion and/or an ambient portion of the multi-channel audio signal based on the spatial parametric information. The direct/ambience extractor is configured for extracting a direct signal portion and/or an ambient signal portion from the downmix signal based on the estimated level information of the direct portion or the ambient portion.12-13-2012
20120177204Audio Signal Decoder, Method for Decoding an Audio Signal and Computer Program Using Cascaded Audio Object Processing Stages - An audio signal decoder for providing an upmix signal representation in dependence on a downmix signal representation and an object-related parametric information includes an object separator configured to decompose the downmix signal representation, to provide a first audio information describing a first set of one or more audio objects of a first audio object type and a second audio information describing a second set of one or more audio objects of a second audio object type, in dependence on the downmix signal representation and using at least a part of the object-related parametric information.07-12-2012
20120224702PARAMETRIC ENCODING AND DECODING - An encoder for a multi-channel audio signal which comprises a down-mixer (09-06-2012
20120189127STEREO DECODING METHOD AND APPARATUS - A stereo decoding method and apparatus are disclosed. The method includes: restoring a monophonic signal from a received code stream through decoding; restoring an interchannel level difference, a group delay, and a group phase from the received code stream through decoding; and processing the monophonic signal according to the interchannel level difference, group delay, and group phase to obtain a first channel signal and a second channel signal. According to the stereo decoding method and apparatus provided in embodiments of the present invention, the first and second channel signals are obtained according to the monophonic signal, ILD, group delay, and group phase by referring to not only the ILD but also the group delay and group phase, thereby yielding favorable stereo sound field effect for the obtained first and second channel signals.07-26-2012
20120082316MULTI-CHANNEL AUDIO ENCODING AND DECODING - An audio encoder and decoder use architectures and techniques that improve the efficiency of multi-channel audio coding and decoding. The described strategies include various techniques and tools, which can be used in combination or independently. For example, an audio encoder performs a pre-processing multi-channel transform on multi-channel audio data, varying the transform so as to control quality. The encoder groups multiple windows from different channels into one or more tiles and outputs tile configuration information, which allows the encoder to isolate transients that appear in a particular channel with small windows, but use large windows in other channels. Using a variety of techniques, the encoder performs flexible multi-channel transforms that effectively take advantage of inter-channel correlation. An audio decoder performs corresponding processing and decoding. In addition, the decoder performs a post-processing multi-channel transform for any of multiple different purposes.04-05-2012
20110002469Apparatus for Capturing and Rendering a Plurality of Audio Channels - A method comprising selecting a subset of audio sources from a plurality of audio sources, and transmitting signals from said selected subset of audio sources to an apparatus, wherein said subset of audio sources is selected in dependence on information provided by said apparatus.01-06-2011
20120269352ELECTRONIC DEVICE AND DECODING METHOD OF AUDIO DATA THEREOF - A decoding method of audio data is applied to an electronic device. The method includes: calculating difference values of the left and right channel audio signal values; determining time slots, wherein each of the first difference values exceeds a threshold value and a time length of the time slots exceeds a preset time; respectively multiplying the time slots with the left channel audio signal values and the right channel audio signal values to obtains and then making subtraction to obtain DM10-25-2012
20120269353AUDIO SIGNAL DECODER, AUDIO SIGNAL ENCODER, METHOD FOR PROVIDING AN UPMIX SIGNAL REPRESENTATION, METHOD FOR PROVIDING A DOWNMIX SIGNAL REPRESENTATION, COMPUTER PROGRAM AND BITSTREAM USING A COMMON INTER-OBJECT-CORRELATION PARAMETER VALUE - An audio signal decoder for providing an upmix signal representation on the basis of a downmix signal representation and an object-related parametric information and in dependence on a rendering information has an object parameter determinator. The object parameter determinator is configured to obtain inter-object-correlation values for a plurality of pairs of audio objects. The object parameter determinator is configured to evaluate a bitstream signaling parameter in order to decide whether to evaluate individual inter-object-correlation bitstream parameter values to obtain inter-object-correlation values for a plurality of pairs of related audio objects, or to obtain inter-object-correlation values for a plurality of pairs of related audio objects using a common inter-object-correlation bitstream parameter value. The audio signal decoder also has a signal processor configured to obtain the upmix signal representation on the basis of the downmix signal representation and using the inter-object-correlation values for a plurality of pairs of related objects and the rendering information.10-25-2012
20120321090SYSTEM, MEDIUM, AND METHOD OF ENCODING/DECODING MULTI-CHANNEL AUDIO SIGNALS - An system, method, and method of encoding/decoding a multi-channel audio signal, including a decoding level generation unit producing decoding-level information that helps a bitstream including a number of audio channel signals and space information to be decoded into a number of audio channel signals, wherein the space information includes information about magnitude differences and/or similarities between channels, and an audio decoder decoding the bitstream according to the decoding-level information. Accordingly, even a single input bitstream can be decoded into a suitable number of channels depending on the type of a speaker configuration used. Scalable channel decoding can be achieved by partially decoding an input bitstream. In the scalable channel decoding, a decoder may set decoding levels and outputs audio channel signals according to the decoding levels, thereby reducing decoding complexity.12-20-2012
20120281841APPARATUS AND METHOD FOR ENCODING/DECODING A MULTI-CHANNEL AUDIO SIGNAL - Disclosed is an apparatus and method for encoding and decoding a multichannel audio signal. The encoding apparatus may compute a weight matrix from a multichannel audio signal to be encoded, and may extract a base signal from the multichannel audio signal using the computed weight matrix.11-08-2012
20120288100METHOD AND APPARATUS FOR PROCESSING MULTI-CHANNEL DE-CORRELATION FOR CANCELLING MULTI-CHANNEL ACOUSTIC ECHO - Provided are a method and apparatus for multi-channel de-correlation processing for cancelling a multi-channel acoustic echo. The method includes: dividing an input multi-channel audio signal into units of frames to form multi-channel audio signals in units of frames; analyzing eigen values and eigen vectors related to the multi-channel audio signals by using the multi-channel audio signals in units of frames every time contents are modified; and separating the multi-channel audio signals in units of frames into a plurality of signal component spaces by using the analyzed eigen values and eigen vectors.11-15-2012
20110158415Audio Signal Decoder, Audio Signal Encoder, Encoded Multi-Channel Audio Signal Representation, Methods and Computer Program - An audio signal decoder for providing a decoded multi-channel audio signal representation on the basis of an encoded multi-channel audio signal representation has a time warp decoder configured to selectively use individual audio channel specific time warp contours or a joint multi-channel time warp contour for a reconstruction of a plurality of audio channels represented by the encoded multi-channel audio signal representation. An audio signal encoder for providing an encoded representation of a multi-channel audio signal has an encoded audio representation provider configured to selectively provide an audio representation having a common time warp contour information, commonly associated with a plurality of audio channels of the multi-channel audio signal, or an encoded audio representation having individual time warp contour information, individually associated with the different audio channels of the plurality of audio channels, in dependence on an information describing a similarity or difference between time warp contours associated with the audio channels of the plurality of audio channels.06-30-2011
20120243691WIRELESS HEADSET DEVICE CAPABLE OF PROVIDING BALANCED STEREO AND METHOD THEREOF - A wireless earphone device capable of providing balanced stereo. The wireless headset includes a Bluetooth earphone device, an audio adaptor, and a stereo earphone device for giving balanced sounds on both left and right channels. When the Bluetooth earphone device and the stereo earphone device are connected with the audio adaptor respectively, an audio switching module of the Bluetooth earphone device determines to transmit stereo audio signal with first channel signal and second channel signal to the stereo earphone device through the audio adaptor. Otherwise, only one channel of the stereo audio signal is transmitted from the audio switching module to a mono speaker unit on the Bluetooth earphone device.09-27-2012
20130170652FRONT WAVE FIELD SYNTHESIS (WFS) SYSTEM AND METHOD FOR PROVIDING SURROUND SOUND USING 7.1 CHANNEL CODEC - Provided is a system and method for front wave field synthesis (WFS) to provide a surround sound with a reduced number of loudspeakers. An apparatus for encoding a front WFS signal in the front WFS system may include a content receiving unit to receive WFS content including the first channels corresponding to a front array speaker and the second channels corresponding to a rear surround sound speaker, and an encoding unit to encode the first channels and the second channels using a multichannel encoder corresponding to the number of the channels included in the WFS content.07-04-2013
20130202118SIGNAL PROCESSING APPARATUS AND SIGNAL PROCESSING METHOD, ENCODER AND ENCODING METHOD, DECODER AND DECODING METHOD, AND PROGRAM - The present invention relates to a signal processing apparatus and a signal processing method, an encoder and an encoding method, a decoder and a decoding method, and a program capable of reproducing music signal having a better sound quality by expansion of frequency band.08-08-2013
20120275608METHOD FOR ENCODING/DECODING AN IMPROVED STEREO DIGITAL STREAM AND ASSOCIATED ENCODING/DECODING DEVICE - A method for encoding and decoding a digital audio signal composed of an original right-hand signal (S11-01-2012
20120275607SBR BITSTREAM PARAMETER DOWNMIX - The present document relates to audio decoding and/or audio transcoding. In particular, the present document relates to a scheme for efficiently decoding a number M of audio channels from a bitstream comprising a higher number N of audio channels. In this context a method and system for merging a first and a second source set of spectral band replication (SBR) parameters to a target set of SBR parameters is described. The first and second source set comprise a first and second frequency band partitioning, respectively, which are different from one another. The first source set comprises a first set of energy related values associated with frequency bands of the first frequency band partitioning. The second source set comprises a second set of energy related values associated with frequency bands of the second frequency band partitioning. The target set comprises a target energy related value associated with an elementary frequency band. The method comprises the steps of breaking up the first and the second frequency band partitioning into a joint grid comprising the elementary frequency band; assigning a first value of the first set of energy related values to the elementary frequency band; assigning a second value of the second set of energy related values to the elementary frequency band; and combining the first and second value to yield the target energy related value for the elementary frequency band.11-01-2012
20120281842METHOD, MEDIUM, AND APPARATUS ENCODING AND/OR DECODING EXTENSION DATA FOR SURROUND - A method, medium, and apparatus encoding and/or decoding an audio signal to surround data. While encoding spatial information, which can up-mix an audio signal to a surround signal, to extension data, a length of a payload corresponding to the spatial information is encoded and a payload of the spatial information is decoded using the length of the payload. Accordingly, compatibility of the spatial information can be provided, and the spatial information can be transmitted by effectively embedding the spatial information.11-08-2012
20110311063EMBEDDING AND EXTRACTING ANCILLARY DATA - The invention proposes a method for embedding an ancillary data into a compressed audio signal. This is achieved by replacing Least Significant Bits (LSBs) in at least one frequency subband of the compressed audio signal by the ancillary data. When replacing LSB bits of compressed subband signals with the ancillary data, the subband signal is effectively modified, resulting in a different decoded output. The replaced LSB bits corresponding to the ancillary data are conveyed as part of the bitstream and can be easily extracted at the decoder. In such a way the decoder obtains the ancillary data that can be used for more advanced audio reproduction at the decoder. The compressed audio itself maintains a good audio quality despite the replacement of the LSB bits of the frequency subband, because the LSB bits do not contribute to the audible artefacts.12-22-2011
20130094654SPATIAL AUDIO - In summary, this application describes a psycho-acoustically motivated, parametric description of the spatial attributes of multichannel audio signals. This parametric description allows strong bitrate reductions in audio coders, since only one monaural signal has to be transmitted, combined with (quantized) parameters which describe the spatial properties of the signal. The decoder can form the original amount of audio channels by applying the spatial parameters. For near-CD-quality stereo audio, a bitrate associated with these spatial parameters of 10 kbit/s or less seems sufficient to reproduce the correct spatial impression at the receiving end.04-18-2013
20120093322METHOD AND APPARATUS FOR DOWNMIXING MULTI-CHANNEL AUDIO SIGNALS - Downmixing multi-channel audio signals to target channels by pre-downmixing frequency coefficients that are encoded using a most frequently used block type in stereo channels in the frequency domain, thereby reducing an amount of calculations and an amount of power required to downmix the multi-channel audio signals.04-19-2012
20120093321APPARATUS AND METHOD FOR ENCODING AND DECODING SPATIAL PARAMETER - An apparatus and method for encoding and decoding a spatial parameter are provided. A spatial parameter encoding apparatus may encode a spatial parameter using a correlation between spatial parameters indicating a characteristic relationship between channels of a multi-channel audio signal, so that the multi-channel audio signal may be efficiently encoded.04-19-2012
20130208901QUANTIZATION MATRICES FOR DIGITAL AUDIO - Quantization matrices facilitate digital audio encoding and decoding. An audio encoder generates and compresses quantization matrices; an audio decoder decompresses and applies the quantization matrices. The invention includes several techniques and tools, which can be used in combination or separately. For example, the audio encoder can generate quantization matrices from critical band patterns for blocks of audio data. The encoder can compute the quantization matrices directly from the critical band patterns, which can be computed from the same audio data that is being compressed. The audio encoder/decoder can use different modes for generating/applying quantization matrices depending on the coding channel mode of multi-channel audio data. The audio encoder/decoder can use different compression/decompression modes for the quantization matrices, including a parametric compression/decompression mode.08-15-2013
20130208902ENCODING DEVICE AND METHOD, DECODING DEVICE AND METHOD, AND PROGRAM - The present invention relates to an encoding device and method, and a decoding device and method, and a program which enable music signals to be played with higher sound quality by expanding a frequency band.08-15-2013

Patent applications in class Variable decoder