| Entries |
| Document | Title | Date |
|---|
| 20080219455 | METHOD AND APPARATUS FOR ENCODING AND DECODING NOISE SIGNAL - Provided is a method and apparatus for encoding/decoding an audio signal. Sections which are not used to output noise components near important spectral components and sub-bands which are not used to output noise components, are determined to be encoded or decoded, so that the efficiency of encoding and decoding an audio signal increases, and sound quality can be improved using less bits. | 09-11-2008 |
| 20080267414 | VOICE OUTPUTTING APPARATUS AND VOICE OUTPUTTING METHOD - According to one embodiment, an audio outputting apparatus comprises: an audio outputting apparatus comprising: a first input unit to which a first compressed audio stream is input with respect to each frame, the first compressed audio stream including a compressed audio data and an extended data; a second input unit to which a second compressed audio stream is input with respect to each frame, the second compressed audio stream including a compressed audio data; a multiplex unit that inserts the second compressed audio stream into an extended data region of a corresponding frame of the first compressed audio stream to generate a multiplexed compressed audio stream; and an output unit that externally outputs the multiplexed compressed audio stream in a predetermined transmission mode. | 10-30-2008 |
| 20090316914 | 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. | 12-24-2009 |
| 20100014679 | Multi-channel encoding and decoding method and apparatus - Provided are a multi-channel encoding and decoding method and apparatus capable of encoding and decoding residual signal by removing redundant information between a plurality of channels without a downmixed signal. In the method and apparatus, a reference signal which is to be used for encoding from a plurality of channel signals, the phase differences between the respective channel signals and the reference signal, gains which are the ratios of the amplitudes of the respective channel signals to the amplitude of the reference signal, and residual signals which correspond to differences between predicted signals and the actual channel signals, are encoded or decoded. The predicted signals are obtained by applying the phase differences and gains to the reference signal. | 01-21-2010 |
| 20100014680 | Method and an Apparatus for Decoding an Audio Signal - A method for processing an audio signal, comprising: receiving a downmix signal, an object information, and a mix information; generating a multi-channel information including at least one gain modification factor using the object information and the mix information, wherein the gain modification factor corresponds to a time-subband-variant factor for controlling gain of the downmix signal is disclosed. | 01-21-2010 |
| 20100046762 | 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 |
| 20100061558 | APPARATUS, METHOD AND COMPUTER PROGRAM FOR PROVIDING A SET OF SPATIAL CUES ON THE BASIS OF A MICROPHONE SIGNAL AND APPARATUS FOR PROVIDING A TWO-CHANNEL AUDIO SIGNAL AND A SET OF SPATIAL CUES - An apparatus for providing a set of spatial cues associated with an upmix audio signal having more than two channels on the basis of a two-channel microphone signal has a signal analyzer and a spatial side information generator. The signal analyzer is configured to obtain a component energy information and a direction information on the basis of the two-channel microphone signal, such that the component energy information describes estimates of energies of a direct sound component of the two-channel microphone signal and of a diffuse sound component of the two-channel microphone signal, and such that the directional information describes an estimate of a direction from which the direct sound component of the two-channel microphone signal originates. The spatial side information generator is configured to map the component energy information and the direction information onto a spatial cue information describing the set of spatial cues associated with an upmix audio signal having more than two channels. | 03-11-2010 |
| 20110002470 | Method for Representing Multi-Channel Audio Signals - A multi-channel input signal having at least three original channels is represented by a parameter representation of the multi-channel signal. A first balance parameter, a first coherence parameter, or a first inter-channel time difference between a first channel pair and a second balance parameter, or a second coherence parameter, or a second inter-channel time difference parameter between a second channel pair are calculated. This set of parameters is the parameter representation of the original signals. The first channel pair has two channels, which are different from two channels of a second channel pair. Furthermore, each channel of the two channel pairs is one of the original channels, or a weighted combination of the original channels, and the first channel pair and the second channel pair include information on the three original channels. | 01-06-2011 |
| 20110085671 | Apparatus and Method for Encoding a Multi-Channel Audio Signal - An encoding apparatus comprises a frame processor ( | 04-14-2011 |
| 20110103593 | Method and System For a Pipelined Dual Audio Path Processing Audio Codec - Methods and systems for a pipelined dual audio path processing audio CODEC are disclosed and may comprise centrally generating multiplexer (MUX) select signals for clock domains in an audio CODEC including a plurality of audio inputs and audio processing paths. The MUX select signals may be generated in a single clock domain. Each of the audio processing paths may traverse a plurality of clock domains and may include infinite impulse response (IIR) and cascaded integrator comb (CIC) filters. One or more adders may be shared in the CIC filters, and one or more multipliers and one or more adders may be shared in the IIR filters. The clock domains may be synchronized utilizing the centrally generated enable signals. An output signal of the IIR filters may be buffered in each of the audio paths utilizing a first-in-first-out buffer. The MUX select signals may be generated utilizing a finite state machine. | 05-05-2011 |
| 20110200198 | Low Bitrate Audio Encoding/Decoding Scheme with Common Preprocessing - An audio encoder has a common preprocessing stage, an information sink based encoding branch such as spectral domain encoding branch, a information source based encoding branch such as an LPC-domain encoding branch and a switch for switching between these branches at inputs into these branches or outputs of these branches controlled by a decision stage. An audio decoder has a spectral domain decoding branch, an LPC-domain decoding branch, one or more switches for switching between the branches and a common post-processing stage for post-processing a time-domain audio signal for obtaining a post-processed audio signal. | 08-18-2011 |
| 20110235810 | APPARATUS AND METHOD FOR GENERATING A MULTI-CHANNEL SYNTHESIZER CONTROL SIGNAL, MULTI-CHANNEL SYNTHESIZER, METHOD OF GENERATING AN OUTPUT SIGNAL FROM AN INPUT SIGNAL AND MACHINE-READABLE STORAGE MEDIUM - An apparatus and a method for generating a multi-channel synthesizer control signal, a multi-channel synthesizer, a method of generating an output signal from an input signal and a machine-readable storage medium are provided. On an encoder-side, a multi-channel input signal is analyzed for obtaining smoothing control information, which is to be used by a decoder-side multi-channel synthesis for smoothing quantized transmitted parameters or values derived from the quantized transmitted parameters for providing an improved subjective audio quality in particular for slowly moving point sources and rapidly moving point sources having tonal material such as fast moving sinusoids. | 09-29-2011 |
| 20110317843 | STEREO ENCODING METHOD, STEREO ENCODING DEVICE, AND ENCODER - A stereo encoding method, a stereo encoding device, and an encoder are provided. The stereo encoding method includes: obtaining a left channel energy relation coefficient and a right channel energy relation coefficient; obtaining a left energy sum and a right energy sum respectively; performing cross correlation between sub-bands of a first monophonic signal at a wave trough and sub-bands of the left channel signal according to the left channel energy relation coefficient, and performing cross correlation between sub-bands of the first monophonic signal at the wave trough and sub-bands of the right channel signal according to the right channel energy relation coefficient; obtaining a scaling factor by using the left energy sum, the right energy sum, and cross correlation results; and encoding the stereo left and right channel signals according to the scaling factor. | 12-29-2011 |
| 20120020482 | APPARATUS AND METHOD FOR ENCODING AND DECODING MULTI-CHANNEL AUDIO SIGNAL - Disclosed is an apparatus for encoding and decoding a multi-channel audio signal. The apparatus for encoding the multi-channel audio signal groups channels of a multi-channel audio signal, eliminates redundant information between channels using a mixing matrix including phase information, converts a frequency of the signal, and encodes the signal. | 01-26-2012 |
| 20120087503 | MULTI-CHANNEL AUDIO OVER STANDARD WIRELESS PROTOCOL - A wireless multi-channel audio system including an audio source with a wireless transceiver configured to communicate according to a standard wireless protocol and an audio controller, which are collectively configured to establish wireless communications with multiple audio sinks via a corresponding wireless link, to assign each audio sink a corresponding audio channel, to synchronize timing with each audio sink, and to transmit audio information for each audio channel to a corresponding audio sink via a corresponding wireless link. The audio source may inquire as to supported audio parameters, such as sample rate and audio codec, and selects a commonly supported configuration. The audio source may separate audio information into queues for each audio channel for each audio sink. The audio source transmits frames with timestamps and a common start time for synchronization, and the audio sinks use this information to synchronize timing and remain virtually synchronized with each other. | 04-12-2012 |
| 20120087504 | 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. | 04-12-2012 |
| 20120093323 | AUDIO SYSTEM AND METHOD OF DOWN MIXING AUDIO SIGNALS USING THE SAME - An audio system that provides an optimized sense of realism and an optimized three-dimensional effect to a user, the audio system including: a horizontal plane speaker set including a center channel speaker that is disposed at a reference point, a left channel speaker and a right channel speaker that are disposed at points in right and left directions of the reference point, and at least one first channel speaker and at least one second channel speaker that are disposed in right and left directions of the reference point, respectively; and a vertical plane speaker set including a left height channel speaker and a right height channel speaker that are respectively disposed in right and left directions of the reference point and in a vertical direction of the reference point, and a center height channel speaker that is disposed in the vertical direction of the reference point. | 04-19-2012 |
| 20120134501 | METHOD AND APPARATUS FOR ENCODING AND DECODING STEREO SIGNAL AND MULTI-CHANNEL SIGNAL - Provided are a method and apparatus for encoding and decoding a stereo signal or a multi-channel signal. According to the method and apparatus, a stereo signal or a multi-channel signal can be encoded and/or decoded by generating parameters based on a mono signal. | 05-31-2012 |
| 20120163608 | ENCODER, ENCODING METHOD, AND COMPUTER-READABLE RECORDING MEDIUM STORING ENCODING PROGRAM - An encoder includes, a degree-of-importance calculating unit that calculates a degree of importance of each of a first number of signals included in input signals; a signal converting unit that converts the first number of signals included in the input signals into a second number of signals; a degree-of-importance converting unit that converts a first number of degrees of importance, a number of which is equal to the first number of signals, calculated by the degree-of-importance calculating unit into a second number of degrees of importance, a number of which is equal to the second number of signals; a number-of-bits determining unit that determines a number of bits for use in quantizing each of the second number of signals obtained by the conversion performed by the signal converting; and a quantizing unit that quantizes each of the second number. | 06-28-2012 |
| 20120163609 | APPARATUS FOR PROCESSING A MULTI-CHANNEL AUDIO SIGNAL AND METHOD THEREOF - A multi-channel audio signal transmitting apparatus of the present invention includes an encoding unit configured to encode a predetermined audio signal and a controller configured to transmit the encoded audio signal to a predetermined device based on an HDAI (high definition audio interface) protocol. | 06-28-2012 |
| 20120201389 | PROCESSING OF SOUND DATA ENCODED IN A SUB-BAND DOMAIN - Processing of sound data encoded in a sub-band domain, for dual-channel playback of binaural or transaural® type is provided, in which a matrix filtering is applied so as to pass from a sound representation with N channels with N>0, to a dual-channel representation. This sound representation with N channels comprises considering N virtual loudspeakers surrounding the head of a listener, and, for each virtual loudspeaker of at least some of the loudspeakers: a first transfer function specific to an ipsilateral path from the loudspeaker to a first ear of the listener, facing the loudspeaker, and a second transfer function specific to a contralateral path from said loudspeaker to the second ear of the listener, masked from the loudspeaker by the listener's head. The matrix filtering comprises a multiplicative coefficient defined by the spectrum, in the sub-band domain, of the second transfer function deconvolved with the first transfer function. | 08-09-2012 |
| 20120207312 | PRESERVING MATRIX SURROUND INFORMATION IN ENCODED AUDIO/VIDEO SYSTEM AND METHOD - A method and apparatus for preserving matrix-surround information in encoded audio/video includes a receiver operative to receive matrix-surround encoded audio signals via a modem, separate the audio signals into a frequency spectrum having discrete audio frequencies, and determine a cutoff threshold used to encode the matrix-surround encoded audio signals. The method and apparatus further includes a decoder operative to decode a first set of the audio frequencies below the determined cutoff threshold using a first matrix-surround preserving audio encoding method and to decode a second set of audio frequencies above the cutoff threshold using a second non matrix-surround preserving audio encoding method. | 08-16-2012 |
| 20120207313 | Coding of Multi-Channel Signals - A system comprises: first and second base stations; and a plurality of relay nodes, each of said relay nodes connected to the first base station, each of said relay nodes being connected to at least one other relay node, whereby at least one relay node is configured to at least one of receive and send information for another of said relays nodes; wherein when at least one of the plurality of relay nodes is handed over to a second base station the at least one relay node is configured to receive and/or send information via another of the relay nodes connected to the first base station. | 08-16-2012 |
| 20120224703 | AUDIO CODING DEVICE, AUDIO CODING METHOD, AND COMPUTER-READABLE RECORDING MEDIUM STORING AUDIO CODING COMPUTER PROGRAM - An audio coding device includes a time frequency transform unit that, with respect to each of a plurality of channels included in an audio signal, generates a time frequency signal indicating frequency components at each time by performing a time frequency transform on a signal of the channel; a transient detection unit that detects a transient with respect to each of the plurality of channels so as to obtain a transient detection time; a transient time correction unit that, when a difference in transient detection times between an early detection channel in which the transient detection time is earliest and a late detection channel that is a channel other than the early detection channel among the plurality of channels is within a range in which the transient; a grid determination unit that, with respect to each of the plurality of channels, and a coding unit that codes. | 09-06-2012 |
| 20120314877 | Sparse Audio - A method comprising: sampling received audio at a first rate to produce a first audio signal; transforming the first audio signal into a sparse domain to produce a sparse audio signal; re-sampling of the sparse audio signal to produce a re-sampled sparse audio signal; and providing the re-sampled sparse audio signal, wherein bandwidth required for accurate audio reproduction is removed but bandwidth required for spatial audio encoding is retained AND/OR a method comprising: receiving a first sparse audio signal for a first channel; receiving a second sparse audio signal for a second channel; and processing the first sparse audio signal and the second sparse audio signal to produce one or more inter-channel spatial audio parameters. | 12-13-2012 |
| 20120314878 | MULTICHANNEL AUDIO STREAM COMPRESSION - A method for compressing an audio stream, including a plurality of signals, describing a sound scene produced by a plurality of sources in a space, by: identifying the sources from an audio stream; determining a frequency band, energy level and spatial position in the space for each of the identified sources; determining, for each identified source, a spatial resolution corresponding to the smallest difference in position of said source in the space which a listener is capable of perceiving, on the basis of: the frequency band, the energy level, and the spatial position of said source; and, on the frequency band, energy level, and spatial position of at least one subset of the other identified sources; generating a compressed stream comprising the information required to restore each identified source with at least the same corresponding spatial resolution. | 12-13-2012 |
| 20120314879 | PARAMETRIC JOINT-CODING OF AUDIO SOURCES - The following coding scenario is addressed: A number of audio source signals need to be transmitted or stored for the purpose of mixing wave field synthesis, multi-channel surround, or stereo signals after decoding the source signals. The proposed technique offers significant coding gain when jointly coding the source signals, compared to separately coding them, even when no redundancy is present between the source signals. This is possible by considering statistical properties of the source signals, the properties of mixing techniques, and spatial hearing. The sum of the source signals is transmitted plus the statistical properties of the source signals which mostly determine the perceptually important spatial cues of the final mixed audio channels. Source signals are recovered at the receiver such that their statistical properties approximate the corresponding properties of the original source signals. Subjective evaluations indicate that high audio quality is achieved by the proposed scheme. | 12-13-2012 |
| 20130003980 | AUDIO ENCODER, AUDIO ENCODING METHOD AND PROGRAM - There is provided an audio encoder comprising a determination part determining, based on frequency spectra of audio signals of a plurality of channels, a mixing ratio as a ratio, relative to a frequency spectrum after mixing for each channel of the plurality of channels, of the frequency spectrum for another channel, a mixing part mixing the frequency spectra of the plurality of channels for each channel based on the mixing ratio determined by the determination part, and an encoding part encoding the frequency spectra of the plurality of channels after mixing by the mixing part. | 01-03-2013 |
| 20130016843 | COMPATIBLE MULTI-CHANNEL CODING/DECODING - In processing a multi-channel audio signal having at least three original channels, a first downmix channel and a second downmix channel are provided, which are derived from the original channels. For a selected original channel, channel side information are calculated such that a downmix channel or a combined downmix channel including the first and the second downmix channels, when weighted using the channel side information, results in an approximation of the selected original channel. The channel side information and the first and second downmix channels form output data to be transmitted to a decoder, which, in case of a low level decoder only decodes the first and second downmix channels or, in case of a high level decoder provides a full multi-channel audio signal based on the downmix channels and the channel side information. | 01-17-2013 |
| 20130034233 | AUDIO SIGNAL ENCODING METHOD AND DEVICE - An audio signal encoding device includes: a window determination unit for determining the type of window of each channel; a correction unit for correcting the number of available bits; and a quantization unit for quantizing the audio signal of each channel sequentially so that the number of bits is equal to or less than the corrected number of available bits while adding the number of bits left unused, and the correction unit includes: a use rate history calculation unit for calculating a bit use rate in quantization of each type of window; and a corrected bit number calculation unit for correcting the number of available bits so that the rate of used bits to the number of available bits of each channel on the assumption that quantization is performed with the calculated bit use rate in quantization approaches the same. | 02-07-2013 |
| 20130077793 | METHOD AND APPARATUS FOR DOWN-MIXING MULTI-CHANNEL AUDIO - Provided are a multi-channel audio down-mixing method and apparatus for selecting down-mix target channels based on a calculation of correlations between channels and then down-mixing the down-mix target channels. The method includes: calculating correlations between channels of multi-channel audio; selecting a first channel and a second channel, among the channels of the multi-channel audio, that are to be down-mixed, based on the calculated correlations; and down-mixing the selected first channel and the selected second channel. | 03-28-2013 |
| 20130094655 | Method and Apparatus for Generating Sideband Residual Signal - Embodiments of the present invention provide a method and an apparatus for generating a sideband residual signal. The method includes: comparing energy of a first signal input by a first sound channel with energy of a second signal input by a second sound channel; if the energy of the first signal is greater than the energy of the second signal, generating a sideband residual signal by allocating a monophonic quantization error to the first signal; and if the energy of the first signal is smaller than the energy of the second signal, generating a sideband residual signal by allocating a monophonic quantization error to the second signal. By using the method and apparatus provided in the embodiments of the present invention, it can be avoided that a monophonic quantization error has a greater impact on a signal whose energy is smaller. | 04-18-2013 |
| 20130129096 | Audio Signal Synthesizer - The invention relates to an audio signal synthesizer, the audio signal synthesizer comprises a transformer for transforming the down-mix audio signal into frequency domain to obtain a transformed audio signal; a signal generator for generating a first auxiliary signal, for generating a second auxiliary signal, and for generating a third auxiliary signal upon the basis of the transformed audio signal; a de-correlator for generating a first de-correlated signal, and for generating a second de-correlated signal from the third auxiliary signal, the first de-correlated signal and the second de-correlated signal being at least partly de-correlated; and a combiner for combining the first auxiliary signal with the first de-correlated signal to obtain a first audio signal, and for combining the second auxiliary signal with the second de-correlated signal to obtain the second audio signal, the first audio signal and the second audio signal forming the multi-channel audio signal. | 05-23-2013 |
| 20130142341 | APPARATUS AND METHOD FOR MERGING GEOMETRY-BASED SPATIAL AUDIO CODING STREAMS - An apparatus for generating a merged audio data stream is provided. The apparatus includes a demultiplexer for obtaining a plurality of single-layer audio data streams, wherein each input audio data stream includes one or more layers, wherein the demultiplexer is adapted to demultiplex each one of one or more input audio data streams having one or more layers into two or more demultiplexed audio data streams having exactly one layer. Furthermore, the apparatus includes a merging module for generating the merged audio data stream based on the plurality of single-layer audio data streams. Each layer of the input data audio streams, of the demultiplexed audio data streams, of the single-layer data streams and of the merged audio data stream includes a pressure value of a pressure signal, a position value and a diffuseness value as audio data. | 06-06-2013 |
| 20130182854 | AUDIO CODING DEVICE AND METHOD - An audio coding device that uses a first-channel signal, a second-channel signal, and a plurality of channel prediction coefficients included in a code book, according to which predictive coding is performed on a third-channel signal, the first-channel signal, the second-channel signal, and the third-channel signal being included in a plurality of channels of an audio signal, the device includes, a processor; and a memory which stores a plurality of instructions, which when executed by the processor, cause the processor to execute, determining a distribution of error defined by a difference between the third-channel signal before predictive coding and the third-channel signal after predictive coding as a given curved surface according to the first-channel signal, the second-channel signal, and the third-channel signal before predictive coding; and calculating channel prediction coefficients, included in the code book. | 07-18-2013 |
| 20130208903 | REVERBERATION ESTIMATOR - A method comprising determining a reverberation time estimate for an audio signal from a first part of an encoded audio signal representing the audio signal. | 08-15-2013 |
| 20140016786 | SYSTEMS, METHODS, APPARATUS, AND COMPUTER-READABLE MEDIA FOR THREE-DIMENSIONAL AUDIO CODING USING BASIS FUNCTION COEFFICIENTS - Systems, methods, and apparatus for a unified approach to encoding different types of audio inputs are described. | 01-16-2014 |
| 20140016787 | FRAME ELEMENT LENGTH TRANSMISSION IN AUDIO CODING - Frame elements which shall be made available for skipping may are transmitted more efficiently by arranging that a default payload length information is transmitted separately within a configuration block, with the length information within the frame elements, in turn, being subdivided into a default payload length flag followed, if the default payload length flag is not set, by a payload length value explicitly coding the payload length of the respective frame element. However, if the default payload length flag is set, an explicit transmission of the payload length may be avoided. Rather, any frame element, the default extension payload length flag of which is set, has the default payload length and any frame element, the default extension payload length flag of which is not set, has a payload length corresponding to the payload length value. By this measure, transmission effectiveness is increased. | 01-16-2014 |
| 20140050324 | DATA EMBEDDING DEVICE, DATA EMBEDDING METHOD, DATA EXTRACTOR DEVICE, AND DATA EXTRACTION METHOD - A data embedding device includes a processor; and a memory which stores a plurality of instructions, which when executed by the processor, cause the processor to execute, extracting, from a code book storing a plurality of prediction coefficients, a plurality of candidates of prediction coefficients of a channel signal out of a plurality of channel signals, each candidate having a predictive error falling within a specific range of predictive error of predictive encoding of two other channel signals; and selecting from the extracted candidates a prediction coefficient as a result of the predictive encoding in accordance with a specific data embedding rule and embedding embed target data into the selected prediction coefficient. | 02-20-2014 |
| 20140050325 | MULTI-DIMENSIONAL PARAMETRIC AUDIO SYSTEM AND METHOD - Systems and methods for producing multi-dimensional parametric audio are provided. The systems and methods can be configured to determine a desired spatial position of an audio component relative to a predetermined listening position; process the audio component for a predetermined number of output channels, wherein the step of processing the audio component comprises determining the appropriate phase, delay, and gain values for each output channel so that the audio component is created at the desired apparent spatial position relative to the listening position; encode two or more output channels of the audio component with the determined phase, delay, and gain values for each output channel; and modulate the encoded output channels onto respective ultrasonic carriers for emission via a predetermined number of ultrasonic emitters | 02-20-2014 |
| 20140086416 | SYSTEMS, METHODS, APPARATUS, AND COMPUTER-READABLE MEDIA FOR THREE-DIMENSIONAL AUDIO CODING USING BASIS FUNCTION COEFFICIENTS - Systems, methods, and apparatus for a unified approach to encoding different types of audio inputs are described. | 03-27-2014 |
| 20140098963 | PARAMETRIC ENCODER FOR ENCODING A MULTI-CHANNEL AUDIO SIGNAL - The invention relates to a parametric audio encoder, comprising a parameter generator, the parameter generator being configured to determine a first set of encoding parameters and reference audio signal values, wherein the reference audio signal is another audio channel signal or a downmix audio signal derived from at least two audio channel signals of the plurality of multi-channel audio signals, to determine a first encoding parameter average based on the first set of encoding parameters of the audio channel signal, to determine a second encoding parameter average based on the first encoding parameter average of the audio channel signal and at least one other first encoding parameter average of the audio channel signal, and to determine the encoding parameter based on the first encoding parameter average of the audio channel signal and the second encoding parameter average of the audio channel signal. | 04-10-2014 |
| 20140112481 | HIERARCHICAL DECCORELATION OF MULTICHANNEL AUDIO - Provided are methods, systems, and apparatus for hierarchical decorrelation of multichannel audio. A hierarchical decorrelation algorithm is designed to adapt to possibly changing characteristics of an input signal, and also preserves the energy of the original signal. The algorithm is invertible in that the original signal can be retrieved if needed. Furthermore, the proposed algorithm decomposes the decorrelation process into multiple low-complexity steps. The contribution of these steps is generally in a decreasing order, and thus the complexity of the algorithm can be scaled. | 04-24-2014 |
| 20140112482 | Method for Parametric Spatial Audio Coding and Decoding, Parametric Spatial Audio Coder and Parametric Spatial Audio Decoder - A method for parametric spatial audio coding of a multi-channel audio signal comprising a plurality of audio channel signals is provided, the method comprising: calculating at least two different spatial coding parameters for an audio channel signal of the plurality of audio channel signals, selecting at least one spatial coding parameter of the at least two different spatial coding parameters associated with the audio channel signal on the basis of the values of the calculated spatial coding parameters; including a quantized representation of the selected spatial coding parameter into a parameter section of an audio bitstream; and setting a parameter type flag in the parameter section of the audio bitstream indicating the type of the selected spatial coding parameter being included into the audio bitstream. | 04-24-2014 |
| 20140140516 | METHOD AND APPARATUS FOR PROCESSING A MULTI-CHANNEL AUDIO SIGNAL - The invention relates to a method for processing a multi-channel audio signal which carries a plurality of audio channel signals. The method comprises determining a time-scaling position using the plurality of audio channel signals and time-scaling each audio channel signal of the plurality of audio channel signals according to the time-scaling position to obtain a plurality of time scaled audio channel signals. | 05-22-2014 |
| 20140161262 | FM STEREO RADIO RECEIVER BY USING PARAMETRIC STEREO - The invention relates to an apparatus ( | 06-12-2014 |
| 20140192987 | MATRIX ENCODER WITH IMPROVED CHANNEL SEPARATION - An encoder is disclosed for use in a surround sound system wherein at least four audio input signals (FL, FR, RL, RR) representing an original sound field are encoded into two channel signals (L, and the encoded two channel signals are decoded into at least four audio output signals (FL′, FR′, RL′, RR′) corresponding to the four audio input signals. The encoder includes matrix means connected to receive the four audio input signals for encoding the four input signals into two channel (L and R) output signals. The matrix means includes means responsive to the four input signals for producing L | 07-10-2014 |
| 20140211949 | SOUND FIELD REPRODUCTION - In a system and method for reproducing a sound field the orientation of a computing device may be detected. Several orientation indications may be used to detect the computing device orientation. The detected orientation may be relative to a sound field that is a spatial representation of an audible environment associated with the computing device. Audio transducers associated with the computing device may be selected in order to reproduce the sound field based on the detected orientation. A received encoding may be processed and reproduced with the selected audio transducers. | 07-31-2014 |
| 20140211950 | SOUND FIELD ENCODER - In a system and method for encoding a sound field the orientation of a computing device may be detected. Several orientation indications may be used to detect the computing device orientation. The detected orientation may be relative to a sound field that is a spatial representation of an audible environment associated with the computing device. Microphones associated with the computing device may be selected in order to receive the sound field based on the detected orientation. The received sound field may be processed and encoded with associated descriptive information. | 07-31-2014 |
| 20140219459 | ALLOCATION, BY SUB-BANDS, OF BITS FOR QUANTIFYING SPATIAL INFORMATION PARAMETERS FOR PARAMETRIC ENCODING - A method is provided for allocating bits for quantifying spatial information parameters by frequency sub-band for parametric encoding/decoding of a multichannel audio stream representative of a soundstage consisting of a plurality of sound sources. The method includes a step of quantifying or inversely quantifying, by frequency sub-band, spatial information parameters for the sound sources of the soundscape. The method further includes: assessing a spatial resolution of the current sub-band on the basis of the spectral properties of the sub-band; and determining a number of bits to be allocated to the current sub-band, the number of bits to be allocated being inversely proportional to the estimated spatial resolution. Also provided is a device for allocating quantification bits implementing the above-described method. | 08-07-2014 |
| 20140219460 | Method and System for Generating A Matrix-Encoded Two-Channel Audio Signal - In some embodiments, a method for generating a matrix-encoded two-channel audio signal in response to a horizontal B-format signal by performing a mixing operation. In other embodiments, a method for generating a matrix-encoded two-channel audio signal, including steps of generating microphone output signals (by capturing sound with a microphone array), and performing a mixing operation on the microphone output signals, where the mixing operation is equivalent to generating a horizontal B-format signal in response to the microphone output signals, and generating the matrix-encoded two-channel audio signal in response to the horizontal B-format signal. The microphone array is typically a small array of cardiod microphones (e.g., an array consisting of three cardiod microphones). Other aspects include systems (e.g., encoders) programmed or otherwise configured to perform any embodiment of the method for generating a matrix-encoded two-channel audio signal. | 08-07-2014 |
| 20140247946 | TRANSFORMING SPHERICAL HARMONIC COEFFICIENTS - In general, techniques are described for transforming spherical harmonic coefficients. A device comprising one or more processors may perform the techniques. The processors may be configured to parse the bitstream to determine transformation information describing how the sound field was transformed to reduce a number of the plurality of hierarchical elements that provide information relevant in describing the sound field. The processors may further be configured to, when reproducing the sound field based on those of the plurality of hierarchical elements that provide information relevant in describing the sound field, transform the sound field based on the transformation information to reverse the transformation performed to reduce the number of the plurality of hierarchical elements. | 09-04-2014 |
| 20140355768 | PERFORMING SPATIAL MASKING WITH RESPECT TO SPHERICAL HARMONIC COEFFICIENTS - In general, techniques are described by which to perform spatial masking with respect to spherical harmonic coefficients. As one example, an audio encoding device comprising a processor may perform various aspects of the techniques. The processor may be configured to perform spatial analysis based on the spherical harmonic coefficients describing a three-dimensional sound field to identify a spatial masking threshold. The processor may further be configured to render the multi-channel audio data from the plurality of spherical harmonic coefficients, and compress the multi-channel audio data based on the identified spatial masking threshold to generate a bitstream. | 12-04-2014 |
| 20140355769 | ENERGY PRESERVATION FOR DECOMPOSED REPRESENTATIONS OF A SOUND FIELD - In general, techniques are described for performing a vector-based synthesis with respect to higher order ambisonic coefficients (or, in other words, spherical harmonic coefficients). A device comprising a processor may be configured to perform the techniques. The processor may perform the vector-based synthesis with respect to spherical harmonic coefficients to generate decomposed representations of the plurality of spherical harmonic coefficients and determine distinct and background directional information from the directional information. The processor may then reduce an order of the directional information associated with the background audio objects to generate transformed background directional information, and apply compensation to increase values of the transformed directional information to preserve an overall energy of the sound field. | 12-04-2014 |
| 20140355770 | TRANSFORMED HIGHER ORDER AMBISONICS AUDIO DATA - In general, techniques are described for obtaining one or more first vectors describing distinct components of a soundfield and one or more second vectors describing background components of the soundfield, both the one or more first vectors and the one or more second vectors generated at least by performing a transformation with respect to a plurality of spherical harmonic coefficients. | 12-04-2014 |
| 20140355771 | COMPRESSION OF DECOMPOSED REPRESENTATIONS OF A SOUND FIELD - In general, techniques are described for obtaining decomposed versions of spherical harmonic coefficients. In accordance with these techniques, a device comprising one or more processors may be configured to determine a first non-zero set of coefficients of a vector that represent a distinct component of a sound field, the vector having been decomposed from a plurality of spherical harmonic coefficients that describe the sound field. | 12-04-2014 |
| 20150010155 | Method for Determining an Encoding Parameter for a Multi-Channel Audio Signal and Multi-Channel Audio Encoder - The invention relates to a method for determining an encoding parameter for an audio channel signal of a multi-channel audio signal, the method comprising: determining for the audio channel signal a set of functions from the audio channel signal and a reference audio signal; determining a first set of encoding parameters based on a smoothing of the set of functions with respect to a frame sequence of the multi-channel audio signal, the smoothing being based on a first smoothing coefficient; determining a second set of encoding parameters based on a smoothing of the set of functions with respect to the frame sequence of the multi-channel audio signal, the smoothing being based on a second smoothing coefficient; and determining the encoding parameter based on a quality criterion with respect to the first set of encoding parameters and/or the second set of encoding parameters. | 01-08-2015 |
| 20150049872 | MULTI-CHANNEL AUDIO ENCODER AND METHOD FOR ENCODING A MULTI-CHANNEL AUDIO SIGNAL - The invention relates to a method for determining an encoding parameter for an audio channel signal of a multi-channel audio signal, the method comprising: determining a frequency transform of the audio channel signal; determining a frequency transform of a reference audio signal; determining inter channel differences for at least each frequency sub-band of a subset of frequency sub-bands, each inter channel difference indicating a phase difference or time difference between a band-limited signal portion of the audio channel signal and a band-limited signal portion of the reference audio signal in the respective frequency sub-band the inter-channel difference is associated to; determining a first average based on positive values of the inter-channel differences and determining a second average based on negative values of the inter-channel differences; and determining the encoding parameter based on the first average and on the second average. | 02-19-2015 |
| 20150071447 | CODING OF SPHERICAL HARMONIC COEFFICIENTS - In general, techniques are described for coding of spherical harmonic coefficients representative of a three dimensional soundfield. A device comprising a memory and one or more processors may be configured to perform the techniques. The memory may be configured to store a plurality of spherical harmonic coefficients. The one or more processors may be configured to perform an energy analysis with respect to the plurality of spherical harmonic coefficients to determine a reduced version of the plurality of spherical harmonic coefficients. | 03-12-2015 |
| 20150131801 | APPARATUS, METHOD AND COMPUTER PROGRAM FOR UPMIXING A DOWNMIX AUDIO SIGNAL USING A PHASE VALUE SMOOTHING - 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 and a parameter determinator. The upmixer is configured to apply temporally variable upmix parameters to upmix the downmix audio signal in order to obtain the upmixed audio signal, wherein the temporally variable upmix parameters include temporally variable smoothened phase values. The parameter determinator is configured to obtain one or more temporally smoothened upmix parameters for usage by the upmixer on the basis of a quantized upmix parameter input information. The parameter determinator is configured to combine a scaled version of a previous smoothened phase value with a scaled version of an input phase information using a phase change limitation algorithm, to determine a current smoothened phase value on the basis of the previous smoothened phase value and the phase input information. | 05-14-2015 |
| 20150310871 | STEREO AUDIO SIGNAL ENCODER - An apparatus comprising: a channel analyser configured to determine at least one set of parameters defining a difference between at least two audio signal channels; a value analyser configured to analyse the at least one set of parameters to determine an initial trend; a mapper configured to map instances of the at least one set of parameters according to a first mapping to generate mapped instances with associated order position instances based on the initial trend; and an encoder configured to encode the mapped instances based on the order position of the mapped instances. | 10-29-2015 |
| 20150317984 | AUDIO-DATA TRANSMISSION SYSTEM AND AUDIO-DATA TRANSMISSION METHOD - The present invention provides an audio-data transmission system including a channel encoder, a data modulator and a speaker. The channel encoder is utilized to receive and encode a bit signal and generates an encoding signal. The data modulator is utilized to receive the encoding signal and modulates it to an audio signal whose frequency is on a frequency band. The audio signal includes at least four different sub-audio signals. The frequency band includes at least four sub-frequency bands with different frequencies. The frequencies of the at least four sub-audio signals are respectively on the at least four sub-frequency bands. The speaker is utilized to transmit the audio signal including the at least four different sub-audio signals. | 11-05-2015 |
| 20150317988 | DOWN-MIXING COMPENSATION FOR AUDIO WATERMARKING - Example methods, apparatus, systems and articles of manufacture to implement down-mixing compensation for audio watermarking are disclosed. Example watermark embedding methods disclosed herein include determining respective attenuation factors for a plurality of audio bands based on energy values associated with down-mixed audio samples corresponding to a first audio channel of a multi-channel audio signal and a second audio channel of the multi-channel audio signal. Disclosed example watermark embedding methods also include embedding a watermark in audio samples of the first audio channel based on the attenuation factors. | 11-05-2015 |
| 20150332679 | METHOD AND APPARATUS FOR COMPRESSING AND DECOMPRESSING A HIGHER ORDER AMBISONICS REPRESENTATION FOR A SOUND FIELD - The invention improves HOA sound field representation compression. The HOA representation is analysed for the presence of dominant sound sources and their directions are estimated. Then the HOA representation is decomposed into a number of dominant directional signals and a residual component. This residual component is transformed into the discrete spatial domain in order to obtain general plane wave functions at uniform sampling directions, which are predicted from the dominant directional signals. Finally, the prediction error is transformed back to the HOA domain and represents the residual ambient HOA component for which an order reduction is performed, followed by perceptual encoding of the dominant directional signals and the residual component. | 11-19-2015 |
| 20150332680 | Object Clustering for Rendering Object-Based Audio Content Based on Perceptual Criteria - Embodiments are directed a method of rendering object-based audio comprising determining an initial spatial position of objects having object audio data and associated metadata, determining a perceptual importance of the objects, and grouping the audio objects into a number of clusters based on the determined perceptual importance of the objects, such that a spatial error caused by moving an object from an initial spatial position to a second spatial position in a cluster is minimized for objects with a relatively high perceptual importance. The perceptual importance is based at least in part by a partial loudness of an object and content semantics of the object. | 11-19-2015 |
| 20150340044 | HIGHER ORDER AMBISONICS SIGNAL COMPRESSION - Systems and techniques for compression and decoding of audio data are generally disclosed. An example device for compressing higher order ambisonic (HOA) coefficients representative of a soundfield includes a memory configured to store audio data and one or more processors configured to: determine when to use ambient HOA coefficients of the HOA coefficients to augment one or more foreground audio objects obtained through decomposition of the HOA coefficients based on one or more singular values also obtained through the decomposition of the HOA coefficients, the ambient HOA coefficients representative of an ambient component of the soundfield. | 11-26-2015 |
| 20150364143 | METHOD AND APPARATUS FOR TRANSMITTING AUDIO DATA - An electronic device that uses a method of transmitting audio data is provided. The method includes encoding first audio data of a first audio stream section included in an audio stream, encoding second audio data of a second audio stream section included in the audio stream, transmitting the encoded first audio data to a first auxiliary device, and transmitting the encoded second audio data to a second auxiliary device after a time corresponding to a predetermined interval. | 12-17-2015 |
| 20150371644 | NON-LINEAR INVERSE CODING OF MULTICHANNEL SIGNALS - Upmix or coding apparatus for an audio signal, having: an inverse coding apparatus for determining a first channel and a second channel by means of linear inverse coding from an input signal; characterized by a first gain ( | 12-24-2015 |
| 20150371646 | Time-Varying Filters for Generating Decorrelation Signals - Decorrelation filter parameters for audio data may be based, at least in part, on audio characteristics such as tonality information and/or transient information. Determining the audio characteristics may involve receiving explicit audio characteristics with the audio data and/or determining audio characteristics based on one or more attributes of the audio data. The decorrelation filter parameters may include dithering parameters and/or randomly selected pole locations for at least one pole of an all-pass filter. The dithering parameters and/or pole locations may involve a maximum stride value for pole movement. In some examples, the maximum stride value may be substantially zero for highly tonal signals of the audio data. The dithering parameters and/or pole locations may be bounded by constraint areas within which pole movements are constrained. The constraint areas may or may not be fixed. In some implementations, different channels of the audio data may share the same constraint areas. | 12-24-2015 |
| 20150380000 | Signal Decorrelation in an Audio Processing System - Audio processing methods may involve receiving audio data corresponding to a plurality of audio channels. The audio data may include a frequency domain representation corresponding to filterbank coefficients of an audio encoding or processing system. A decorrelation process may be performed with the same filterbank coefficients used by the audio encoding or processing system. The decorrelation process may be performed without converting coefficients of the frequency domain representation to another frequency domain or time domain representation. The decorrelation process may involve selective or signal-adaptive decorrelation of specific channels and/or specific frequency bands. The decorrelation process may involve applying a decorrelation filter to a portion of the received audio data to produce filtered audio data. The decorrelation process may involve using a non-hierarchal mixer to combine a direct portion of the received audio data with the filtered audio data according to spatial parameters. | 12-31-2015 |
| 20160005405 | Methods for Audio Signal Transient Detection and Decorrelation Control - Some audio processing methods may involve receiving audio data corresponding to a plurality of audio channels and determining audio characteristics of the audio data, which may include transient information. An amount of decorrelation for the audio data may be based, at least in part, on the audio characteristics. If a definite transient event is determined, a decorrelation process may be temporarily halted or slowed. Determining transient information may involve evaluating the likelihood and/or the severity of a transient event. In some implementations, determining transient information may involve evaluating a temporal power variation in the audio data. Explicit transient information may or may not be received with the audio data, depending on the implementation. Explicit transient information may include a transient control value corresponding to a definite transient event, a definite non-transient event or an intermediate transient control value. | 01-07-2016 |
| 20160005406 | Methods for Controlling the Inter-Channel Coherence of Upmixed Audio Signals - Audio characteristics of audio data corresponding to a plurality of audio channels may be determined. The audio characteristics may include spatial parameter data. Decorrelation filtering processes for the audio data may be based, at least in part, on the audio characteristics. The decorrelation filtering processes may cause a specific inter-decorrelation signal coherence (“IDC”) between channel-specific decorrelation signals for at least one pair of channels. The channel-specific decorrelation signals may be received and/or determined. Inter-channel coherence (“ICC”) between a plurality of audio channel pairs may be controlled. Controlling ICC may involve at receiving an ICC value and/or determining an ICC value based, at least partially, on the spatial parameter data. A set of IDC values may be based, at least partially, on the set of ICC values. A set of channel-specific decorrelation signals, corresponding with the set of IDC values, may be synthesized by performing operations on the filtered audio data. | 01-07-2016 |
| 20160019899 | Audio Processing - An audio processing system ( | 01-21-2016 |
| 20160019900 | METHOD AND APPARATUS FOR LATTICE VECTOR QUANTIZATION OF AN AUDIO SIGNAL - An apparatus comprising: a vector generator configured to generate a first vector of parameters defining at least one audio signal; a vector extender configured to extend the first vector of parameters to a second vector, where the first vector is length n and the second vector is length n, where m is greater than n; a vector transformer configured to transform the second vector, a lattice quantizer configured to lattice quantize the transformed second vector; and a reverse transformer configured to reverse transform the lattice quantized transformed second vector, such that the first n components of a reverse transformed lattice quantized transformed second vector are a lattice quantization of the first vector. | 01-21-2016 |
| 20160029138 | Methods and Systems for Interactive Rendering of Object Based Audio - Methods for generating an object based audio program which is renderable in a personalizable manner, e.g., to provide an immersive, perception of audio content of the program. Other embodiments include steps of delivering (e.g., broadcasting), decoding, and/or rendering such a program. Rendering of audio objects indicated by the program may provide an immersive experience. The audio content of the program may be indicative of multiple object channels (e.g., object channels indicative of user-selectable and user-configurable objects, and typically also a default set of objects which will be rendered in the absence of a selection by a user) and a bed of speaker channels. Another aspect is an audio processing unit (e.g., encoder or decoder) configured to perform, or which includes a buffer memory which stores at least one frame (or other segment) of an object based audio program (or bitstream thereof) generated in accordance with, any embodiment of the method. | 01-28-2016 |
| 20160035357 | AUDIO SIGNAL ENCODER COMPRISING A MULTI-CHANNEL PARAMETER SELECTOR - An apparatus comprising: a channel analyser configured to determine for a first frame of at least one audio signal a set of first frame audio signal multi-channel parameters; a multichannel parameter selector configured to select for the first frame a sub-set of the set of first frame audio signal multi-channel parameters based on a value associated with the first frame; and a multichannel parameter encoder configured to generate an encoded first frame audio signal multi-channel parameter based on the selected sub-set of the set of first frame audio signal multi-channel parameters. | 02-04-2016 |
| 20160035358 | SYSTEMS, METHODS, APPARATUS, AND COMPUTER-READABLE MEDIA FOR THREE-DIMENSIONAL AUDIO CODING USING BASIS FUNCTION COEFFICIENTS - Systems, methods, and apparatus for a unified approach to encoding different types of audio inputs are described. | 02-04-2016 |
| 20160042740 | METHOD AND DEVICE OF EXTRACTING SOUND SOURCE ACOUSTIC IMAGE BODY IN 3D SPACE - The invention provides a method and device of extracting a sound source acoustic image body in 3D space. The method includes: determining a spatial position of a sound source acoustic image and determining a speaker beside the spatial position where the sound source acoustic image is located according to the determined spatial position (ρ, μ, η) of the sound source acoustic image; calculating a correlation of signals of all sound tracks of the selected speaker in the horizontal direction and the vertical direction, and obtaining and storing a parameter set {IC | 02-11-2016 |
| 20160057556 | METHOD AND APPARATUS FOR ENHANCING DIRECTIVITY OF A 1ST ORDER AMBISONICS SIGNAL - Recordings from microphones that provide 1 | 02-25-2016 |
| 20160064003 | Methods and Systems for Generating and Rendering Object Based Audio with Conditional Rendering Metadata - Methods and audio processing units for generating an object based audio program including conditional rendering metadata corresponding to at least one object channel of the program, where the conditional rendering metadata is indicative of at least one rendering constraint, based on playback speaker array configuration, which applies to each corresponding object channel, and methods for rendering audio content determined by such a program, including by rendering content of at least one audio channel of the program in a manner compliant with each applicable rendering constraint in response to at least some of the conditional rendering metadata. Rendering of a selected mix of content of the program may provide an immersive experience. | 03-03-2016 |
| 20160064005 | INTERMEDIATE COMPRESSION FOR HIGHER ORDER AMBISONIC AUDIO DATA - In general, techniques are directed to intermediate compression of higher order ambisonic audio data. For example, a device comprising a processor and a memory may be configured to perform the techniques. The memory may be configured to store an intermediately formatted audio data generated as a result of an intermediate compression of higher order ambisonic audio data. The one or more processors may be configured to process the intermediately formatted audio data. | 03-03-2016 |
| 20160078872 | COMPATIBLE MULTI-CHANNEL CODING/DECODING - In processing a multi-channel audio signal having at least three original channels, a first downmix channel and a second downmix channel are provided, which are derived from the original channels. For a selected original channel, channel side information are calculated such that a downmix channel or a combined downmix channel including the first and the second downmix channels, when weighted using the channel side information, results in an approximation of the selected original channel. The channel side information and the first and second downmix channels form output data to be transmitted to a decoder, which, in case of a low level decoder only decodes the first and second downmix channels or, in case of a high level decoder provides a full multi-channel audio signal based on the downmix channels and the channel side information. | 03-17-2016 |
| 20160078877 | AUDIO SIGNAL ENCODER - An apparatus comprising: a channel analyser configured to determine for a first frame of at least one audio signal a set of first frame audio signal multi-channel parameters; a multichannel difference selector configured to select for the first frame groups of elements of the set of first frame audio signal multi-channel parameters based on a value associated with the first frame; and a multichannel parameter encoder configured to generate an encoded first frame audio signal multi-channel parameter based on the selected groups of elements of the set of first frame audio signal multi-channel parameters. | 03-17-2016 |
| 20160104492 | 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. | 04-14-2016 |
| 20160111098 | Audio Encoder and Decoder - The present disclosure provides methods, devices and computer program products for encoding and decoding of a vector of parameters in an audio coding system. The disclosure further relates to a method and apparatus for reconstructing an audio object in an audio decoding system. According to the disclosure, a modulo differential approach for coding and encoding a vector of a non-periodic quantity may improve the coding efficiency and provide encoders and decoders with less memory requirements. Moreover, an efficient method for encoding and decoding a sparse matrix is provided. | 04-21-2016 |
| 20160111100 | AUDIO SIGNAL ENCODER - An apparatus comprising: a parameter determiner configured to determine for a frame of at least one audio signal a set of frame audio signal multi-channel parameters; a parameter selector configured to select for the frame a sub-set of the set of frame audio signal multi-channel parameters based on an error value associated with the sub-set of the set of frame audio signal multi-channel parameters; and parameter encoder configured to generate an encoded frame audio signal multi-channel parameter based on the selected sub-set of the set of frame audio signal multi-channel parameters. | 04-21-2016 |
| 20160125888 | CODING OF AUDIO SCENES - Exemplary embodiments provide encoding and decoding methods, and associated encoders and decoders, for encoding and decoding of an audio scene which at least comprises one or more audio objects ( | 05-05-2016 |
| 20160133266 | Multi-Stage Quantization of Parameter Vectors from Disparate Signal Dimensions - A first vector quantization process may be applied to two or more parameter values along a first dimension of the N-dimensional parameter set to produce a first set of quantized values. Two or more parameter prediction values may be calculated for a second dimension of the N-dimensional parameter set based, at least in part, on one or more values of the first set of quantized values. Prediction residual values may be calculated based, at least in part, on the parameter prediction values. A second vector quantization process may be applied to the prediction residual values to produce a second set of quantized values. These processes may be extended to any number of dimensions. Corresponding inverse vector quantization processes may be performed. | 05-12-2016 |
| 20160142844 | IMPROVED RENDERING OF AUDIO OBJECTS USING DISCONTINUOUS RENDERING-MATRIX UPDATES - An audio playback system generates output signals for multiple channels of acoustic transducers by applying a rendering matrix to data representing the aural content and spatial characteristics of audio objects, so that the resulting sound field creates accurate listener impressions of the spatial characteristics. Matrix coefficients are updated to render moving objects. Discontinuous updates of the rendering matrix coefficients are controlled according to psychoacoustic principles to reduce audible artifacts. The updates may also be managed to control the amount of data needed to perform the updates. | 05-19-2016 |
| 20160142845 | Multi-Channel Audio Decoder, Multi-Channel Audio Encoder, Methods and Computer Program using a Residual-Signal-Based Adjustment of a Contribution of a Decorrelated Signal - A multi-channel audio decoder for providing at least two output audio signals on the basis of an encoded representation is configured to perform a weighted combination of a downmix signal, a decorrelated signal and a residual signal, to obtain one of the output audio signals. The multi-channel audio decoder is configured to determine a weight describing a contribution of the decorrelated signal in the weighted combination in dependence on the residual signal. A multi-channel audio encoder for providing an encoded representation of a multi-channel audio signal is configured to obtain a downmix signal on the basis of the multi-channel audio signal, to provide parameters describing dependencies between the channels of the multi-channel audio signal, and to provide a residual signal. The multi-channel audio encoder is configured to vary an amount of residual signal included into the encoded representation in dependence on the multi-channel audio signal. | 05-19-2016 |
| 20160142846 | APPARATUS AND METHOD FOR ENHANCED SPATIAL AUDIO OBJECT CODING - An apparatus for generating one or more audio output channels is provided. The apparatus includes a parameter processor for calculating mixing information and a downmix processor for generating the one or more audio output channels. The downmix processor is configured to receive an audio transport signal including one or more audio transport channels. One or more audio channel signals are mixed within the audio transport signal, and one or more audio object signals are mixed within the audio transport signal, and wherein the number of the one or more audio transport channels is smaller than the number of the one or more audio channel signals plus the number of the one or more audio object signals. The parameter processor is configured to receive downmix information indicating information on how the one or more audio channel signals and the one or more audio object signals are mixed. | 05-19-2016 |
| 20160142847 | APPARATUS AND METHOD FOR REALIZING A SAOC DOWNMIX OF 3D AUDIO CONTENT - An apparatus for generating one or more audio output channels is provided. The apparatus includes a parameter processor for calculating output channel mixing information and a downmix processor for generating the one or more audio output channels. The downmix processor is configured to receive an audio transport signal including one or more audio transport channels, wherein two or more audio object signals are mixed within the audio transport signal, and wherein the number of the one or more audio transport channels is smaller than the number of the two or more audio object signals. The audio transport signal depends on a first mixing rule and on a second mixing rule. The first mixing rule indicates how to mix the two or more audio object signals to obtain a plurality of premixed channels. Moreover, the second mixing rule indicates how to mix the plurality of premixed channels. | 05-19-2016 |
| 20160142853 | APPARATUS AND METHOD FOR MAPPING FIRST AND SECOND INPUT CHANNELS TO AT LEAST ONE OUTPUT CHANNEL - An apparatus for mapping a first input channel and a second input channel of an input channel configuration to at least one output channel of an output channel configuration, wherein each input channel and each output channel has a direction in which an associated loudspeaker is located relative to a central listener position, configured to map the first input channel to a first output channel of the output channel configuration; and despite of the fact that an angle deviation between a direction of the second input channel and a direction of the first output channel is less than an angle deviation between a direction of the second input channel and the second output channel and/or is less than an angle deviation between the direction of the second input channel and the direction of the third output channel, map the second input channel to the second and third output channels by panning between the second and third output channels. | 05-19-2016 |
| 20160150341 | METHOD AND APPARATUS FOR GENERATING FROM A COEFFICIENT DOMAIN REPRESENTATION OF HOA SIGNALS A MIXED SPATIAL/COEFFICIENT DOMAIN REPRESENTATION OF SAID HOA SIGNALS - There are two representations for Higher Order Ambisonics denoted HOA: spatial domain and coefficient domain. The invention generates from a coefficient domain representation a mixed spatial/coefficient domain representation, wherein the number of said HOA signals can be variable. A vector of coefficient domain signals is separated into a vector of coefficient domain signals having a constant number of HOA coefficients and a vector of coefficient domain signals having a variable number of HOA coefficients. The constant-number HOA coefficients vector is transformed to a corresponding spatial domain signal vector. In order to facilitate high-quality coding, without creating signal discontinuities the variable-number HOA coefficients vector of coefficient domain signals is adaptively normalised and multiplexed with the vector of spatial domain signals. | 05-26-2016 |
| 20160180855 | APPARATUS AND METHOD FOR ENCODING AND DECODING MULTI-CHANNEL AUDIO SIGNAL | 06-23-2016 |
| 20160198279 | DETERMINING THE INTER-CHANNEL TIME DIFFERENCE OF A MULTI-CHANNEL AUDIO SIGNAL | 07-07-2016 |
| 20160254002 | METHOD AND APPARATUS FOR ENCODING STEREO PHASE PARAMETER | 09-01-2016 |
| 20190147894 | BINAURAL RENDERING METHOD AND APPARATUS FOR DECODING MULTI CHANNEL AUDIO | 05-16-2019 |
