Entries |
Document | Title | Date |
20090016539 | A/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 |
20090129603 | METHOD 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 |
20100046759 | METHOD 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 |
20100046760 | AUDIO 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 |
20100046761 | EFFICIENT 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 |
20100080397 | AUDIO DECODING METHOD AND APPARATUS - A decoded sound analysis unit ( | 04-01-2010 |
20100310081 | Multi-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 |
20100322429 | Joint 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 |
20100329466 | DEVICE 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 |
20100329467 | REMOVING 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 |
20110002469 | Apparatus 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 |
20110044457 | APPARATUS 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 |
20110044458 | SLOT 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 |
20110044459 | 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 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 |
20110051938 | METHOD 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 |
20110051939 | METHOD 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 |
20110051940 | DECODING 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 |
20110058679 | Method, 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 (L | 03-10-2011 |
20110085670 | TIME 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 |
20110091045 | Audio Encoding and Decoding - An audio encoder ( | 04-21-2011 |
20110091046 | BINAURAL 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 |
20110096931 | CROSSTALK 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 |
20110096932 | PARAMETRIC STEREO UPMIX APPARATUS, A PARAMETRIC STEREO DECODER, A PARAMETRIC STEREO DOWNMIX APPARATUS, A PARAMETRIC STEREO ENCODER - A parametric stereo upmix apparatus ( | 04-28-2011 |
20110103592 | Apparatus 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 |
20110142245 | Output 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 |
20110158415 | Audio 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 |
20110164756 | Cue-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 |
20110182432 | CODING 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 |
20110182433 | DECODING APPARATUS, DECODING METHOD, ENCODING APPARATUS, ENCODING METHOD, AND EDITING APPARATUS - A decoding apparatus ( | 07-28-2011 |
20110200196 | APPARATUS 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 |
20110200197 | Methods 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 |
20110211703 | 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 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 |
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 |
20110249822 | ADVANCED 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 |
20110261969 | BIPHASE 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 |
20110268279 | AUDIO ENCODING DEVICE, DECODING DEVICE, METHOD, CIRCUIT, AND PROGRAM - Provided is an encoding device ( | 11-03-2011 |
20110268280 | AUDIO 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 |
20110293099 | System, 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 |
20110305343 | Method 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 |
20110305344 | METHOD 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 |
20110311063 | EMBEDDING 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 |
20110317842 | APPARATUS, 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 |
20120002818 | Advanced 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 |
20120033819 | SIGNAL 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 |
20120039477 | AUDIO 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 |
20120045067 | ENCODING 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 |
20120057710 | APPARATUS 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 |
20120063604 | SCALABLE 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 |
20120070007 | APPARATUS 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 |
20120076308 | ACOUSTIC 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 |
20120076309 | MULTI-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 |
20120082316 | MULTI-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 |
20120093321 | APPARATUS 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 |
20120093322 | METHOD 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 |
20120128162 | MIXED 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 |
20120155653 | METHOD 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 |
20120163606 | Method and Apparatus for Processing Audio Signals - An apparatus ( | 06-28-2012 |
20120163607 | MATRIX 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 |
20120177204 | Audio 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 |
20120183148 | SYSTEM 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 |
20120189127 | STEREO 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 |
20120201388 | APPARATUS 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 |
20120207311 | OPTIMIZED 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 |
20120213376 | AUDIO 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 |
20120213377 | EFFICIENT 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 |
20120213378 | Spectral 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 |
20120213379 | APPARATUS 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 |
20120224702 | PARAMETRIC ENCODING AND DECODING - An encoder for a multi-channel audio signal which comprises a down-mixer ( | 09-06-2012 |
20120230497 | SYSTEM 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 |
20120237039 | AUDIO 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 | |
20120243690 | APPARATUS 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 |
20120243691 | WIRELESS 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 |
20120243692 | Decoding 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 |
20120263308 | APPARATUS, 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 |
20120269352 | ELECTRONIC 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 DM | 10-25-2012 |
20120269353 | AUDIO 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 |
20120275607 | SBR 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 |
20120275608 | METHOD 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 (S | 11-01-2012 |
20120275609 | MULTI-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 |
20120281841 | APPARATUS 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 |
20120281842 | METHOD, 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 |
20120288100 | METHOD 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 |
20120294447 | APPARATUS 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 |
20120294448 | METHOD, 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 |
20120294449 | METHOD 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 |
20120308016 | MATRIX 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 |
20120308017 | METHOD, 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 |
20120308018 | STEREO 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 |
20120314874 | TWO-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 |
20120314875 | METHOD 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 |
20120314876 | APPARATUS 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 |
20120321090 | SYSTEM, 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 |
20130010971 | METHOD 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 2 | 01-10-2013 |
20130028425 | Stereo 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 H | 01-31-2013 |
20130028426 | MDCT-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 |
20130028427 | SIGNAL 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 |
20130034232 | METHOD 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 |
20130064377 | SIGNAL 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 |
20130089209 | AUDIO-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 |
20130094654 | SPATIAL 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 |
20130170652 | FRONT 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 |
20130202118 | SIGNAL 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 |
20130208901 | QUANTIZATION 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 |
20130208902 | ENCODING 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 |
20130230176 | Method and an Apparatus for Encoding/Decoding a Multichannel Audio Signal - A method and apparatus for decoding a multichannel audio signal comprising the steps of receiving a downmix audio signal and an interchannel cross correlation parameter; deriving an interchannel phase difference parameter from the received interchannel cross correlation parameter; and calculating a decoded multichannel audio signal for the received downmix audio signal depending on the derived interchannel phase difference parameter. | 09-05-2013 |
20130230177 | Downmix Limiting - The invention relates to downmixing techniques by which output audio signals are obtained from input audio signals partitioned into subgroups. A variable common gain limiting factor is applied to all downmix coefficients that govern the contributions from the input signals in a subgroup. While preserving the proportions between signal values within a subgroup, the invention makes it possible to limit the gain of different input signal subgroups to different extents, so that relatively more perceptible signals can be limited relatively less. It then becomes possible to achieve a consistent dialogue level while transitioning in a less perceptible fashion between signal portions with and without gain limiting. Embodiments of the invention include a method, a mixing system and a computer-program product. | 09-05-2013 |
20130236022 | DEVICE AND METHOD FOR POSTPROCESSING A DECODED MULTI-CHANNEL AUDIO SIGNAL OR A DECODED STEREO SIGNAL - According to the invention, a device ( | 09-12-2013 |
20130266145 | MDCT-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 method comprises performing frequency-domain modifications selectively before or after upmixing. | 10-10-2013 |
20130279702 | DEVICE AND METHOD FOR POSTPROCESSING A DECODED MULTI-CHANNEL AUDIO SIGNAL OR A DECODED STEREO SIGNAL - According to the invention, a device for post-processing at least one channel signal of a plurality of channel signals of a multi-channel signal is described, the at least one channel signal being generated from a decoded downmix signal by a low-bit-rate audio coding/decoding system, the device comprising: a receiver for receiving the at least one channel signal generated from the decoded downmix signal, a time envelope of the decoded downmix signal, an interchannel time difference between the channel signal and the downmix signal, and a classification indication indicating a transient type of the downmix signal; and a post-processor for post-processing the at least one channel signal based on the time envelope of the decoded downmix signal weighted by a respective weighting factor and in dependence on the classification indication and the interchannel time difference. | 10-24-2013 |
20130294606 | ADVANCED ENCODING OF MUSIC FILES - Example embodiments allow for the creation, distribution, and use of flexible media formats. Example embodiments may allow individual content files to be rendered in multiple formats and versions. In addition, example embodiments may provide for granular rights management, which may allow users to access content files on a feature-by-feature basis. | 11-07-2013 |
20130294607 | BROADCAST TRANSMITTING APPARATUS AND BROADCAST TRANSMITTING METHOD FOR PROVIDING AN OBJECT-BASED AUDIO, AND BROADCAST PLAYBACK APPARATUS AND BROADCAST PLAYBACK METHOD - A broadcast transmitting apparatus and method, and a broadcast playback apparatus and method for providing an object-based audio by encoding and decoding a multichannel audio signal are provided. The broadcast transmitting apparatus may generate audio identification information used to determine whether the multichannel audio signal is an object-based audio signal. When the multichannel audio signal is determined to be the object-based audio signal, based on the audio identification information, the broadcast playback apparatus may control and output the multichannel audio signal for each channel. | 11-07-2013 |
20130301836 | METHOD AND APPARATUS FOR AUDIO MATRIX DECODING - An audio matrix decoder is provided for decoding input signals L | 11-14-2013 |
20130329892 | Method And Apparatus For Delivery Of Aligned Multi-Channel Audio - There is provided a method of encoding audio and including said encoded audio into a digital transport stream, comprising receiving at an encoder input a plurality of temporally co-located audio signals, assigning identical time stamps per unit time to all of the plurality of temporally co-located audio signals and incorporating the identically time stamped audio signals into the digital transport stream. There is also provided a method decoding said encoded data, and encoding apparatus and decoding apparatus. | 12-12-2013 |
20130343551 | METHOD AND APPARATUS FOR ENCODING/DECODING STEREO AUDIO - Provided are a method and apparatus for encoding/decoding stereo audio. In the method for encoding stereo audio, stereo audio is encoded based on at least one of the phase difference between first and second channel audios and information on an angle made by a vector on the intensity of mono-audio and a vector on the intensity of the first channel audio or a vector on the intensity of the second channel audio. Thus, the number of encoded parameters is minimized so that a compression ratio in the encoding of the stereo audio is improved. | 12-26-2013 |
20140016785 | AUDIO ENCODER AND DECODER HAVING A FLEXIBLE CONFIGURATION FUNCTIONALITY - An audio decoder for decoding an encoded audio signal, the encoded audio signal including a first channel element and a second channel element in a payload section of a data stream and first decoder configuration data for the first channel element and second decoder configuration data for the second channel element in a configuration section of the data stream, includes: a data stream reader for reading the configuration data for each channel element in the configuration section and for reading the payload data for each channel element in the payload section; a configurable decoder for decoding the plurality of channel elements; and a configuration controller for configuring the configurable decoder so that the configurable decoder is configured in accordance with the first decoder configuration data when decoding the first channel element and in accordance with the second decoder configuration data when decoding the second channel element. | 01-16-2014 |
20140029752 | AUDIO DECODING DEVICE AND AUDIO DECODING METHOD - An audio decoding device includes a processor; and a memory which stores a plurality of instructions, which when executed by the processor, cause the processor to execute, decoding, using a first channel signal and a second channel signal included in a plurality of channels of an audio signal having a first frequency range and a second frequency range, a first prediction coefficient of the first frequency range and a second prediction coefficient of the second frequency range, both selected from a code book when prediction-encoding a third channel signal that is not subjected to prediction encoding and that is included in the plurality of channels; decoding a residual signal included in the first frequency range, the residual signal representing an error occurring in prediction encoding; and prediction-decoding the third channel signal subjected to prediction-encoding in the second frequency range from the first channel signal, the second channel signal. | 01-30-2014 |
20140093086 | Audio Encoding Method and Apparatus, Audio Decoding Method and Apparatus, and Encoding/Decoding System - Embodiments of the present invention disclose an audio encoding method. The method includes: obtaining audio data of N channels; and performing channel interleaving and packetization on the obtained audio data of the N channels to obtain data packets, where each data packet includes X*N segments of audio data, where X is a ratio of an amount of audio data included in one data packet to an amount of audio data included in one audio frame, X is an integer greater than or equal to 1, and in the X*N segments of audio data, at least X+1 segments of audio data belong to different audio frames. | 04-03-2014 |
20140126725 | TEMPORAL AND SPATIAL SHAPING OF MULTI-CHANNEL AUDIO SIGNAL - A selected channel of a multi-channel signal which is represented by frames composed from sampling values having a high time resolution can be encoded with higher quality when a wave form parameter representation representing a wave form of an intermediate resolution representation of the selected channel is derived, the wave form parameter representation including a sequence of intermediate wave form parameters having a time resolution lower than the high time resolution of the sampling values and higher than a time resolution defined by a frame repetition rate. The wave form parameter representation with the intermediate resolution can be used to shape a reconstructed channel to retrieve a channel having a signal envelope close to that one of the selected original channel. The time scale on which the shaping is performed is shorter than the time scale of a framewise processing, thus enhancing the quality of the reconstructed channel. On the other hand, the shaping time scale is larger than the time scale of the sampling values, significantly reducing the amount of data needed by the wave form parameter representation. | 05-08-2014 |
20140133661 | AUDIO SIGNAL PROCESSOR FOR PROCESSING ENCODED MULT-CHANNEL AUDIO SIGNALS AND METHOD THEREFOR - An audio signal processor receives a plurality of encoded multi-channel audio signals. A multi-channel decoder ( | 05-15-2014 |
20140161261 | METHOD AND AN APPARATUS FOR PROCESSING AN AUDIO SIGNAL - A method of processing an audio signal, the method including receiving a downmix signal including at least one object signal, and object information extracted when the downmix signal is generated, the at least one object signal including a background object and at least one independent object; receiving mix information including mode selection information, the mix information for controlling the at least object signal; receiving enhanced object information corresponding to a residual signal generated when the at least one object signal is downmixed to the downmix signal; generating downmix processing information by using the object information and the mix information; generating an output signal by applying the downmix processed information to the downmix signal; and extracting the background object and the at least one independent object from the downmix signal, by using the enhanced object information. | 06-12-2014 |
20140177848 | METHOD AND AN APPARATUS FOR PROCESSING AN AUDIO SIGNAL - A method for processing an audio signal at an audio decoder, the method including receiving a downmix signal, a residual signal, and object information; extracting a background-object signal and a foreground-object signal from the downmix signal using the residual signal and object information; receiving mix information including gain information for the background-object signal; generating a downmix processing information based on the object information and the mix information; and generating an output signal including a modified background-object signal and a modified foreground-object signal. The modified background-object signal is obtained by modifying a gain of the background-object signal using the mix information. The modified foreground-object signal is obtained by modifying a gain of the foreground-object signal using the downmix processing information. | 06-26-2014 |
20140177849 | APPARATUS AND METHOD FOR ENCODING AND DECODING MULTI-CHANNEL SIGNAL - Provided are an encoding apparatus and a decoding apparatus of a multi-channel signal. The encoding apparatus of the multi-channel signal may process a phase parameter associated with phase information between a plurality of channels constituting the multi-channel signal, based on a characteristic of the multi-channel signal. The encoding apparatus may generate an encoded bitstream with respect to the multi-channel signal using the processed phase parameter and a mono signal extracted from the multi-channel signal. | 06-26-2014 |
20140205101 | ENCODING DEVICE AND METHOD, DECODING DEVICE AND METHOD, AND PROGRAM - The present technology relates to an encoding device and method, a decoding device and method, and a program that enable audio of a high audio quality to be obtained with a smaller code amount. | 07-24-2014 |
20140211947 | METHOD AND APPARATUS FOR GENERATING AND RESTORING DOWNMIXED SIGNAL - An embodiment of the present invention provides a method for generating a downmixed signal, including: performing a time-frequency transform on a received left sound channel signal and a received right sound channel signal to obtain a frequency domain signal, and dividing the frequency domain signal into several frequency bands; calculating a sound channel energy ratio and a sound channel phase difference of each frequency band; calculating a phase difference between the downmixed signal and a first sound channel signal in each frequency band according to the sound channel energy ratio and the sound channel phase difference; and calculating a frequency domain downmixed signal according to the left sound channel signal, the right sound channel signal, and the phase difference between the downmixed signal and the first sound channel signal in each frequency band. This method effectively improves quality of stereo encoding and decoding. | 07-31-2014 |
20140211948 | DECODING DEVICE, DECODING METHOD, ENCODING DEVICE, ENCODING METHOD, AND PROGRAM - The present technique relates to a decoding device, a decoding method, an encoding device, an encoding method, and a program which can obtain a high-quality realistic sound. | 07-31-2014 |
20140294181 | ORTHOGONAL TRANSFORM APPARATUS, ORTHOGONAL TRANSFORM METHOD, ORTHOGONAL TRANSFORM COMPUTER PROGRAM, AND AUDIO DECODING APPARATUS - An orthogonal transform apparatus computes either one of the real and imaginary components of the quadrature mirror filter coefficient contained in a first subinterval of a plurality of subintervals among which a coefficient sequence containing a plurality of quadrature mirror filter coefficients is divided so that the values of basis functions are symmetrically placed, by computing a sum of products of the plurality of modified discrete cosine transform coefficients and the basis functions corresponding to the subinterval, computes the other one of the real and imaginary components of the quadrature mirror filter coefficient contained in the first subinterval and the real and imaginary components of the quadrature mirror filter coefficient contained in another subintervals by performing a butterfly operation using a computed value produced as a result of the sum of products and computes each quadrature mirror filter coefficient by combining the real component and imaginary component thereof. | 10-02-2014 |
20140355767 | METHOD AND APPARATUS FOR PERFORMING AN ADAPTIVE DOWN- AND UP-MIXING OF A MULTI-CHANNEL AUDIO SIGNAL - A method and apparatus for performing an adaptive down-mixing of a multichannel audio signal comprising a number of input channels, wherein a signal adaptive transformation of said input channels is performed by multiplying the input channels with a downmix block matrix comprising a fixed block for providing a set of backward compatible primary channels and a signal adaptive block for providing a set of secondary channels | 12-04-2014 |
20140362998 | DIRECTIONAL CODING CONVERSION - A directional coding conversion method and system includes receiving input audio signals that comprise directional audio coded signals into which directional audio information is encoded according to a first loudspeaker setup and extracting the directional audio coded signals from the received input audio signals. The method and system further includes decoding, according to the first loudspeaker setup, the extracted directional audio coded signals to provide at least one absolute audio signal and corresponding absolute directional information and processing the at least one absolute audio signal and the absolute directional information to provide first output audio signals coded according to a second loudspeaker setup. | 12-11-2014 |
20150030161 | Decoding 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. | 01-29-2015 |
20150098572 | METHOD AND APPARATUS FOR COMPRESSING AND DECOMPRESSING A HIGHER ORDER AMBISONICS SIGNAL REPRESENTATION - Higher Order Ambisonics (HOA) represents a complete sound field in the vicinity of a sweet spot, independent of loudspeaker set-up. The high spatial resolution requires a high number of HOA coefficients. In the invention, dominant sound directions are estimated and the HOA signal representation is decomposed into dominant directional signals in time domain and related direction information, and an ambient component in HOA domain, followed by compression of the ambient component by reducing its order. The reduced-order ambient component is transformed to the spatial domain, and is perceptually coded together with the directional signals. At receiver side, the encoded directional signals and the order-reduced encoded ambient component are perceptually decompressed, the perceptually decompressed ambient signals are transformed to an HOA domain representation of reduced order, followed by order extension. The total HOA representation is recomposed from the directional signals, the corresponding direction information, and the original-order ambient HOA component. | 04-09-2015 |
20150104021 | SYSTEM FOR MAINTAINING REVERSIBLE DYNAMIC RANGE CONTROL INFORMATION ASSOCIATED WITH PARAMETRIC AUDIO CODERS - On the basis of a bitstream (P), an n-channel audio signal (X) is reconstructed by deriving an m-channel core signal (Y) and multichannel coding parameters (α) from the bitstream, where 1≦m04-16-2015 | |
20150124973 | METHOD AND APPARATUS FOR LAYOUT AND FORMAT INDEPENDENT 3D AUDIO REPRODUCTION - A method for encoding audio signals, for later reproduction in arbitrary three-dimensional loudspeaker layouts, based on the generation of an intermediate channel-independent representation, which enables the creation, manipulation and reproduction of sounds with complex apparent size and shape, including multiple disconnected shapes. | 05-07-2015 |
20150124974 | APPARATUS 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. | 05-07-2015 |
20150131800 | Efficient Encoding and Decoding of Multi-Channel Audio Signal with Multiple Substreams - The present document relates to audio encoding/decoding. In particular, the present document relates to a method and system for improving the quality of encoded multi-channel audio signals. An audio encoder configured to encode a multi-channel audio signal according to a total available data-rate is described. The multi-channel audio signal is representable as a basic group ( | 05-14-2015 |
20150294672 | Method 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 (HOA) uses spherical harmonics of at least 2 | 10-15-2015 |
20150325244 | SYSTEM, 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. | 11-12-2015 |
20150325245 | LOUDSPEAKER BEAMFORMING - In one embodiment, a method comprising receiving at a microphone located at a first location audio received from plural speakers, the audio received at a first amplitude level; and responsive to moving the microphone away from the first location to a second location, causing adjustment of the audio provided by the plural speakers to target the first amplitude level at the microphone. | 11-12-2015 |
20150332682 | SPATIAL RELATION CODING FOR HIGHER ORDER AMBISONIC COEFFICIENTS - A device for decoding audio data comprises a memory to store the audio data; and one or more processors coupled to the memory and configured to obtain spatial information for a spatial relation of non-zero order higher-order ambisonic (HOA) coefficients associated with a spherical basis function having an order greater than zero, with zero-order HOA coefficients associated with a spherical basis function having an order of zero, the spatial information resulting in an error between the non-zero order HOA coefficients and a signal model of the non-zero order HOA coefficients that represents at least one directional component of the non-zero order HOA coefficients in the spatial relation with the zero-order HOA coefficients, wherein the one or more processors are further configured to obtain sign information for the non-zero order HOA coefficients when reconstructing the non-zero order HOA coefficients using the spatial relation. | 11-19-2015 |
20150371645 | ENCODING/DECODING APPARATUS FOR PROCESSING CHANNEL SIGNAL AND METHOD THEREFOR - An encoding/decoding apparatus and method for controlling a channel signal is disclosed, wherein the encoding apparatus may include an encoder to encode an object signal, a channel signal, and rendering information for the channel signal, and a bit stream generator to generate, as a bit stream, the encoded object signal, the encoded channel signal, and the encoded rendering information for the channel signal. | 12-24-2015 |
20150380001 | MDCT-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:
| 12-31-2015 |
20150380002 | APPARATUS AND METHOD FOR MULTICHANNEL DIRECT-AMBIENT DECOMPOSTION FOR AUDIO SIGNAL PROCESSING - An apparatus for generating one or more audio output channel signals depending on two or more audio input channel signals is provided. Each of the two or more audio input channel signals comprises direct signal portions and ambient signal portions. The apparatus comprises a filter determination unit for determining a filter by estimating first power spectral density information and by estimating second power spectral density information. Moreover, the apparatus comprises a signal processor for generating the one or more audio output channel signals by applying the filter on the two or more audio input channel signals. The first power spectral density information indicates power spectral density information on the two or more audio input channel signals, and the second power spectral density information indicates power spectral density information on the ambient signal portions of the two or more audio input channel signals. | 12-31-2015 |
20150382125 | METHOD FOR PROCESSING A MULTICHANNEL SOUND IN A MULTICHANNEL SOUND SYSTEM - The invention relates to a method for processing a multichannel sound in a multichannel sound system, wherein the input signals L and R are decoded, preferably as stereo signals. The aim of the invention is to develop the method such that a further improvement of the spatial reproduction of the input signals L and R is achieved on the basis of an extraction of direction components. According to the invention, this is achieved in that the signals R and L are decoded at least into two signals of the form nL-mR, in which n, m=1, 2, 3, 4. | 12-31-2015 |
20160005407 | Methods for Parametric Multi-Channel Encoding - The present document relates to audio coding systems. In particular, the present document relates to efficient methods and systems for parametric multi-channel audio coding. An audio encoding system ( | 01-07-2016 |
20160012825 | AUDIO ENCODER AND DECODER | 01-14-2016 |
20160027445 | STEREO AUDIO SIGNAL ENCODER - An apparatus comprising a mapper configured to map an instance of a parameter according to a first mapping to generate a first mapped instance; a remapper configured to remap the first mapped instance dependent on the frequency distribution of mapped instances to generate a remapped instance with an associated order position; and an encoder configured to encode the remapped instance dependent on an order position of the remapped instance. | 01-28-2016 |
20160027446 | Stereo Audio Encoder and Decoder - The present disclosure provides methods, devices and computer program products for encoding and decoding a stereo audio signal based on an input signal. According to the disclosure, a hybrid approach of using both parametric stereo coding and a discrete representation of the stereo audio signal is used which may improve the quality of the encoded and decoded audio for certain bitrates. | 01-28-2016 |
20160055854 | Methods and Apparatuses for Generating and Using Low-Resolution Preview Tracks with High-Quality Encoded Object and Multichannel Audio Signals - A low-quality rendition of a complex soundtrack is created, synchronized and combined with the soundtrack. The low-quality rendition may be monitored in mastering operations, for example, to control the removal, replacement or addition of aural content in the soundtrack without the need for expensive equipment that would otherwise be required to render the soundtrack. | 02-25-2016 |
20160055856 | Inter-Channel Level Difference Processing Method and Apparatus - An inter-channel level difference (ICLD) processing method and apparatus are disclosed. A stereo audio signal is received, and the stereo audio signal is parsed frame by frame, to obtain an ICLD of each sub-band of each subframe of each frame of the stereo audio signal; a sum of absolute values of the ICLDs of each subframe of any frame of the stereo audio signal is calculated; and when an absolute value of a difference between the sums of the absolute values of the ICLDs of each two subframes of the any frame is less than a preset threshold, a weighted ICLD value of each sub-band of the any frame is calculated in a first weighting manner; or otherwise, a weighted ICLD value of each sub-band of the any frame is calculated in a second weighting manner. | 02-25-2016 |
20160071522 | ENCODER AND ENCODING METHOD FOR MULTI-CHANNEL SIGNAL, AND DECODER AND DECODING METHOD FOR MULTI-CHANNEL SIGNAL - An encoder and an encoding method for a multi-channel signal, and a decoder and a decoding method for a multi-channel signal are disclosed. A multi-channel signal may be efficiently processed by consecutive downmixing or upmixing. | 03-10-2016 |
20160071523 | METHOD AND APPARATUS FOR ENCODING/DECODING SCALABLE DIGITAL AUDIO USING DIRECT AUDIO CHANNEL DATA AND INDIRECT AUDIO CHANNEL DATA - Apparatuses and methods for encoding/decoding scalable digital audio are disclosed. An apparatus for decoding scalable digital audio according to the present invention includes: an audio packet reception unit configured to receive a digital audio packet, including a plurality of pieces of direct audio channel data mapped to respective physical channels and a plurality of pieces of indirect audio channel data indirectly mapped to respective physical channels; an indirect audio channel extraction unit configured to extract the digital audio packet from the pieces of indirect audio channel data; an indirect audio channel decoding unit configured to generate pieces of audio channel data corresponding to a number of physical channels more than the number of pieces of indirect audio channel data using the pieces of indirect audio channel data; and an audio channel output unit configured to match the pieces of audio channel data to the respective physical channels and perform output. | 03-10-2016 |
20160088415 | METHOD AND APPARATUS FOR COMPRESSING AND DECOMPRESSING A HIGHER ORDER AMBISONICS REPRESENTATION - Higher Order Ambisonics represents three-dimensional sound independent of a specific loudspeaker set-up. However, transmission of an HOA representation results in a very high bit rate. Therefore compression with a fixed number of channels is used, in which directional and ambient signal components are processed differently. The ambient HOA component is represented by a minimum number of HOA coefficient sequences. The remaining channels contain either directional signals or additional coefficient sequences of the ambient HOA component, depending on what will result in optimum perceptual quality. This processing can change on a frame-by-frame basis. | 03-24-2016 |
20160093308 | PREDICTIVE VECTOR QUANTIZATION TECHNIQUES IN A HIGHER ORDER AMBISONICS (HOA) FRAMEWORK - A device configured to decode a bitsream comprising a memory and one or more processors may be configured to perform the techniques herein. The memory may be configured to store a reconstructed plurality of weights used to approximate the multi-directional V-vector in the higher order ambisonics domain from a past time segment; and the one or more processors may be configured to extract, from the bitstream, a weight index, retrieve, from the memory, the reconstructed plurality of weights from the past time segment, vector dequantize the weight index to determine a plurality of residual weight error, and reconstruct a plurality of weights for a current time segment based on the plurality of residual weight errors and the reconstructed plurality of weights used to approximate the multi-directional V-vector in the higher order ambisonics domain from the past time segment. | 03-31-2016 |
20160093311 | SWITCHING BETWEEN PREDICTIVE AND NON-PREDICTIVE QUANTIZATION TECHNIQUES IN A HIGHER ORDER AMBISONICS (HOA) FRAMEWORK - A device comprising a memory and one or more processors may be configured extract, from the bitstream, a type of quantization mode. The one or more processors may also be configured to switch, based on the type of quantization mode, between non-predictive vector dequantization to reconstruct a first set of one or more weights used to approximate the multi-directional V-Vector in the higher order ambisonics domain, and predictive vector dequantization to reconstruct a second set of one or more weights used to approximate the multi-directional V-Vector in the higher order ambisonics domain. The memory may be configured to store the reconstructed first set of one or more weights used to approximate the multi-directional V-Vector in the higher order ambisonics domain, and the reconstructed second set of one or more weights used to approximate the multi-directional V-Vector in the higher order ambisonics domain. | 03-31-2016 |
20160099001 | NORMALIZATION OF AMBIENT HIGHER ORDER AMBISONIC AUDIO DATA - In general, techniques are directed to performing normalization with respect to ambient higher order ambisonic audio data. A device configured to decode higher order ambisonic audio data may perform the techniques. The device may include a memory and one or more processors. The memory may be configured to store an audio channel that provides a normalized ambient higher order ambisonic coefficient representative of at least a portion of an ambient component of a soundfield. The one or more processors may be configured to perform inverse normalization with respect to the audio channel. | 04-07-2016 |
20160099002 | APPARATUS 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 audio signal, generating side information using the multi-channel audio signal or a stereo signal of a down-mixed result, coding the stereo signal and the side information, and transmitting the coded result as a coding signal; and a main decoding unit receiving the coding signal, decoding the stereo signal and the side information using the received coding signal, up mixing the decoded stereo signal using the decoded side information, and restoring the multi-channel audio signal. | 04-07-2016 |
20160104491 | AUDIO SIGNAL PROCESSING METHOD FOR SOUND IMAGE LOCALIZATION - An audio signal processing method for sound image localization according to the present invention comprises the steps of: receiving a bit sequence including an object signal of an audio and object location information of the audio; decoding the object signal and the object location information using the received bit sequence; receiving past object location information, which is past object location information corresponding to the object location information, from a storage medium; generating an object moving path using the received past object location information and the decoded object location information; generating a variable gain value according to time using the generated object moving path; generating a corrected variable gain value using the generated variable gain value and a weighting function; and generating a channel signal from the decoded object signal using the corrected variable gain value. | 04-14-2016 |
20160104493 | SIGNALING LAYERS FOR SCALABLE CODING OF HIGHER ORDER AMBISONIC AUDIO DATA - In general, techniques are described for signaling layers for scalable coding of higher order ambisonic audio data. A device comprising a memory and a processor may be configured to perform the techniques. The memory may be configured to store the bitstream. The processor may be configured to obtain, from the bitstream, an indication of a number of layers specified in the bitstream, and obtain the layers of the bitstream based on the indication of the number of layers. | 04-14-2016 |
20160104494 | SIGNALING CHANNELS FOR SCALABLE CODING OF HIGHER ORDER AMBISONIC AUDIO DATA - In general, techniques are described for signaling channels for scalable coding of higher order ambisonic audio data. A device comprising a memory and a processor may be configured to perform the techniques. The memory may be configured to store the bitstream. The processor may be configured to obtain, from the bitstream, an indication of a number of channels specified in one or more layers in the bitstream, and obtain the channels specified in the one or more layers in the bitstream based on the indication of the number of channels. | 04-14-2016 |
20160104495 | SCREEN RELATED ADAPTATION OF HOA CONTENT - This disclosure describes techniques for coding of higher-order ambisonics audio data comprising at least one higher-order ambisonic (HOA) coefficient corresponding to a spherical harmonic basis function having an order greater than one. This disclosure describes techniques for adjusting HOA soundfields to potentially improve spatial alignment of the acoustic elements to the visual component in a mixed audio/video reproduction scenario. In one example, a device for rendering an HOA audio signal includes one or more processors configured to render the HOA audio signal over one or more speakers based on one or more field of view (FOV) parameters of a reference screen and one or more FOV parameters of a viewing window. | 04-14-2016 |
20160104496 | EFFICIENT CODING OF AUDIO SCENES COMPRISING AUDIO OBJECTS - There is provided encoding and decoding methods for encoding and decoding of object based audio. An exemplary encoding method includes inter alia calculating M downmix signals by forming combinations of N audio objects, wherein M≦N, and calculating parameters which allow reconstruction of a set of audio objects formed on basis of the N audio objects from the M downmix signals. The calculation of the M downmix signals is made according to a criterion which is independent of any loudspeaker configuration. | 04-14-2016 |
20160111096 | AUDIO SIGNAL PROCESSING METHOD - The present invention relates to an audio signal processing method, comprising the steps of: receiving a bit-stream containing a normal channel signal and an exceptional channel signal; decoding the normal channel signal and the exceptional channel signal from the received bit-stream; generating correlation information using the decoded normal channel signal and the decoded exceptional channel signal; generating a gain value by at least one of a first downmix method applying the same downmix gain value using the correlation information and a second downmix method applying variable gain values over time; and outputting the exceptional channel signal as a plurality of channel signals using the gain value. | 04-21-2016 |
20160111097 | METHODS FOR AUDIO ENCODING AND DECODING, CORRESPONDING COMPUTER-READABLE MEDIA AND CORRESPONDING AUDIO ENCODER AND DECODER - The present disclosure provides methods, devices and computer program products which provide less complex and more flexible control of the introduced decorrelation in an audio coding system. According to the disclosure, this is achieved by calculating and using two weighting factors, one for an approximated audio object and one for a decorrelated audio object, for introduction of decorrelation of audio objects in the audio coding system. | 04-21-2016 |
20160111099 | Reconstruction of Audio Scenes from a Downmix - Audio objects are associated with positional metadata. A received downmix signal comprises downmix channels that are linear combinations of one or more audio objects and are associated with respective positional locators. In a first aspect, the downmix signal, the positional metadata and frequency-dependent object gains are received. An audio object is reconstructed by applying the object gain to an upmix of the downmix signal in accordance with coefficients based on the positional metadata and the positional locators. In a second aspect, audio objects have been encoded together with at least one bed channel positioned at a positional locator of a corresponding downmix channel. The decoding system receives the downmix signal and the positional metadata of the audio objects. A bed channel is reconstructed by suppressing the content representing audio objects from the corresponding downmix channel on the basis of the positional locator of the corresponding downmix channel. | 04-21-2016 |
20160125887 | EFFICIENT CODING OF AUDIO SCENES COMPRISING AUDIO OBJECTS - There is provided encoding and decoding methods for encoding and decoding of object based audio. An exemplary encoding method includes inter alia calculating M downmix signals by forming combinations of N audio objects, wherein M≦N, and calculating parameters which allow reconstruction of a set of audio objects formed on basis of the N audio objects from the M downmix signals. The calculation of the M downmix signals is made according to a criterion which is independent of any loudspeaker configuration. | 05-05-2016 |
20160125890 | METHOD FOR ENCODING AUDIO SIGNALS, APPARATUS FOR ENCODING AUDIO SIGNALS, METHOD FOR DECODING AUDIO SIGNALS AND APPARATUS FOR DECODING AUDIO SIGNALS - The invention introduces a new concept for hierarchical coding of HOA content. A method for encoding a hierarchical audio bitstream comprises rendering a HOA input signal to surround sound, encoding the surround sound for a base layer output signal, decoding the encoded surround sound to obtain a reconstructed surround sound signal, performing dimensionality reduction on the received HOA input signal, calculating a residual between the dimensionality-reduced HOA signal and the reconstructed surround sound signal, encoding the residual signal, and multiplexing structural information about the HOA input signal, the encoded residuals and the encoded surround sound into a bitstream to obtain a hierarchical audio bitstream. | 05-05-2016 |
20160127847 | AUDIO SIGNAL OUTPUT DEVICE AND METHOD, ENCODING DEVICE AND METHOD, DECODING DEVICE AND METHOD, AND PROGRAM - The present technology relates to an audio signal output device and a method, an encoding device and a method, a decoding device and a method, and a program for realizing audio reproduction with a more realistic feeling. | 05-05-2016 |
20160133260 | ENCODING DEVICE AND METHOD, DECODING DEVICE AND METHOD, AND PROGRAM - The present technology relates to an encoding device and method, a decoding device and method, and a program therefor capable of improving audio signal transmission efficiency. | 05-12-2016 |
20160133261 | ENCODING DEVICE AND METHOD, DECODING DEVICE AND METHOD, AND PROGRAM - The present technique relates to an encoding device and a method, a decoding device and a method, and a program capable of obtaining higher quality audio. An encoding unit encodes position information and a gain of an object in a current frame in multiple encoding modes. A compressing unit generates, for each combination of encoding modes of each pieces of position information and gains, encoded meta data including encoding mode information indicating the encoding modes and encoded data which are the encoded position information and gains, and compresses the encoding mode information included in the encoding meta data. A determining unit selects encoded meta data of which amount of data is the least from among the encoded meta data generated for each combination, thus determining the encoding mode of each pieces of position information and gains. The present technique can be applied to an encoder and a decoder. | 05-12-2016 |
20160133262 | REDUCTION OF COMB FILTER ARTIFACTS IN MULTI-CHANNEL DOWNMIX WITH ADAPTIVE PHASE ALIGNMENT - An audio signal processing decoder having at least one frequency band and being configured for processing an input audio signal having a plurality of input channels in the at least one frequency band, wherein the decoder is configured to analyze the input audio signal, wherein inter-channel dependencies between the input channels are identified; and to align the phases of the input channels based on the identified inter-channel dependencies, wherein the phases of input channels are the more aligned with respect to each other the higher their inter-channel dependency is; and to downmix the aligned input audio signal to an output audio signal having a lesser number of output channels than the number of the input channels. | 05-12-2016 |
20160133263 | APPARATUS AND METHOD FOR LOW DELAY OBJECT METADATA CODING - An apparatus for generating one or more audio channels is provided. The apparatus comprises a metadata decoder for generating one or more reconstructed metadata signals from one or more processed metadata signals depending on a control signal, wherein each of the one or more reconstructed metadata signals indicates information associated with an audio object signal of one or more audio object signals, wherein the metadata decoder is configured to generate the one or more reconstructed metadata signals by determining a plurality of reconstructed metadata samples for each of the one or more reconstructed metadata signals. The apparatus comprises an audio channel generator for generating the one or more audio channels depending on the one or more audio object signals and depending on the one or more reconstructed metadata signals. The metadata decoder is configured to receive a plurality of processed metadata samples of each of the one or more processed metadata signals. The metadata decoder is configured to receive the control signal. | 05-12-2016 |
20160133267 | CONCEPT FOR AUDIO ENCODING AND DECODING FOR AUDIO CHANNELS AND AUDIO OBJECTS - Audio encoder for encoding audio input data to obtain audio output data includes an input interface for receiving a plurality of audio channels, a plurality of audio objects and metadata related to one or more of the plurality of audio objects; a mixer for mixing the plurality of objects and the plurality of channels to obtain a plurality of pre-mixed channels, each pre-mixed channel including audio data of a channel and audio data of at least one object; a core encoder for core encoding core encoder input data; and a metadata compressor for compressing the metadata related to the one or more of the plurality of audio objects, wherein the audio encoder is configured to operate in at least one mode of the group of two modes. | 05-12-2016 |
20160134988 | 3D IMMERSIVE SPATIAL AUDIO SYSTEMS AND METHODS - Provided are methods and systems for delivering three-dimensional, immersive spatial audio to a user over a headphone, where the headphone includes one or more virtual speaker conditions. The methods and systems recreate a naturally sounding sound field at the user's ears, including cues for elevation and depth perception. Among numerous other potential uses and applications, the methods and systems of the present disclosure may be implemented for virtual reality applications. | 05-12-2016 |
20160140968 | APPARATUS AND METHOD FOR DECODING AN ENCODED AUDIO SIGNAL TO OBTAIN MODIFIED OUTPUT SIGNALS - An apparatus for decoding an encoded audio signal to obtain modified output signals includes an input interface for receiving a transmitted downmix signal and parametric data relating to audio objects included in the transmitted downmix signal, the downmix signal being different from an encoder downmix signal, to which the parametric data is related; a downmix modifier for modifying the transmitted downmix signal using a downmix modification function, wherein the downmix modification is performed in such a way that a modified downmix signal is identical to the encoder downmix signal or is more similar to the encoder downmix signal compared to the transmitted downmix signal; an object renderer for rendering the audio objects using the modified downmix signal and the parametric data to obtain output signals; and an output signal modifier for modifying the output signals using an output signal modification function. | 05-19-2016 |
20160140972 | FREQUENCY-DOMAIN AUDIO CODING SUPPORTING TRANSFORM LENGTH SWITCHING - A frequency-domain audio codec is provided with the ability to additionally support a certain transform length in a backward-compatible manner, by the following: the frequency-domain coefficients of a respective frame are transmitted in an interleaved manner irrespective of the signalization signaling for the frames as to which transform length actually applies, and additionally the frequency-domain coefficient extraction and the scale factor extraction operate independent from the signalization. By this measure, old-fashioned frequency-domain audio coders/decoders, insensitive for the signalization, would be able to nevertheless operate without faults and with reproducing a reasonable quality. Concurrently, frequency-domain audio coders/decoders able to support the additional transform length would offer even better quality despite the backward compatibility. As far as coding efficiency penalties due to the coding of the frequency domain coefficients in a manner transparent for older decoders are concerned, same are of comparatively minor nature due to the interleaving. | 05-19-2016 |
20160140974 | NOISE FILLING IN MULTICHANNEL AUDIO CODING - In multichannel audio coding, an improved coding efficiency is achieved by the following measure: the noise filling of zero-quantized scale factor bands is performed using noise filling sources other than artificially generated noise or spectral replica. In particular, the coding efficiency in multichannel audio coding may be rendered more efficient by performing the noise filling based on noise generated using spectral lines from a previous frame of, or a different channel of the current frame of, the multichannel audio signal. | 05-19-2016 |
20160142850 | APPARATUS AND METHOD FOR EFFICIENT OBJECT METADATA CODING - An apparatus for generating one or more audio channels is provided. The apparatus includes a metadata decoder for receiving one or more compressed metadata signals. Each of the one or more compressed metadata signals includes a plurality of first metadata samples. The metadata decoder is configured to generate one or more reconstructed metadata signals and to generate each of the second metadata samples of each reconstructed metadata signal of the one or more reconstructed metadata signals depending on at least two of the first metadata samples of the reconstructed metadata signal. The apparatus includes an audio channel generator for generating the one or more audio channels depending on the one or more audio object signals and depending on the one or more reconstructed metadata signals. An apparatus for generating encoded audio information including one or more encoded audio signals and one or more compressed metadata signals is provided. | 05-19-2016 |
20160142854 | METHOD FOR PROCESSING AN AUDIO SIGNAL IN ACCORDANCE WITH A ROOM IMPULSE RESPONSE, SIGNAL PROCESSING UNIT, AUDIO ENCODER, AUDIO DECODER, AND BINAURAL RENDERER - A method for processing an audio signal in accordance with a room impulse response is described. The audio signal is separately processed with an early part and a late reverberation of the room impulse response, and the processed early part of the audio signal and the reverberated signal are combined. A transition from the early part to the late reverberation in the room impulse response is reached when a correlation measure reaches a threshold, the threshold being set dependent on the correlation measure for a selected one of the early reflections in the early part of the room impulse response. | 05-19-2016 |
20160157039 | Multi-Channel Decorrelator, Multi-Channel Audio Decoder, Multi-Channel Audio Encoder, Methods and Computer Program using a Premix of Decorrelator Input Signals | 06-02-2016 |
20160174008 | METHOD FOR RENDERING MULTI-CHANNEL AUDIO SIGNALS FOR L1 CHANNELS TO A DIFFERENT NUMBER L2 OF LOUDSPEAKER CHANNELS AND APPARATUS FOR RENDERING MULTI-CHANNEL AUDIO SIGNALS FOR L1 CHANNELS TO A DIFFERENT NUMBER L2 OF LOUDSPEAKER CHANNELS | 06-16-2016 |
20160203822 | RECONSTRUCTING AUDIO CHANNELS WITH A FRACTIONAL DELAY DECORRELATOR | 07-14-2016 |
20160203823 | AUDIO DECODER WITH CORE DECODER AND SURROUND DECODER | 07-14-2016 |
20160254001 | DECODER, ENCODER, AND METHOD FOR INFORMED LOUDNESS ESTIMATION IN OBJECT-BASED AUDIO CODING SYSTEMS | 09-01-2016 |
20170236522 | INTER-CHANNEL ENCODING AND DECODING OF MULTIPLE HIGH-BAND AUDIO SIGNALS | 08-17-2017 |
20170236523 | AUDIO DECODER FOR AUDIO CHANNEL RECONSTRUCTION | 08-17-2017 |
20190147891 | METHODS, APPARATUS AND SYSTEMS FOR DECODING A HIGHER ORDER AMBISONICS (HOA) REPRESENTATION OF A SOUND OR SOUNDFIELD | 05-16-2019 |
20190147893 | ENCODING AND DECODING OF INTERCHANNEL PHASE DIFFERENCES BETWEEN AUDIO SIGNALS | 05-16-2019 |
20190147895 | CODING OF MULTIPLE AUDIO SIGNALS | 05-16-2019 |
20190147896 | ENCODING OF MULTIPLE AUDIO SIGNALS | 05-16-2019 |