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Dolby International Ab patents


Recent patent applications related to Dolby International Ab. Dolby International Ab is listed as an Agent/Assignee. Note: Dolby International Ab may have other listings under different names/spellings. We're not affiliated with Dolby International Ab, we're just tracking patents.

ARCHIVE: New 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 | Company Directory "D" | Dolby International Ab-related inventors


Layered representation and delivery of high dynamic range video

In a method to reconstruct a high dynamic range video signal, a decoder receives a base layer standard dynamic range video signal, an enhancement layer video signal, a metadata bitstream for a reference processing unit and a crc code related to the metadata. A decoder reconstructs a high-dynamic range video output signal based on the base layer video signal, the enhancement layer video signal, and the data syntax and metadata specified by the metadata bitstream.. ... Dolby International Ab

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, and offers significantly reduced computational complexity. ... Dolby International Ab

Layered coding for compressed sound or sound field representations

The present document relates to a method of layered encoding of a compressed sound representation of a sound or sound field. The compressed sound representation comprises a basic compressed sound representation comprising a plurality of components, basic side information for decoding the basic compressed sound representation to a basic reconstructed sound representation of the sound or sound field, and enhancement side information including parameters for improving the basic reconstructed sound representation. ... Dolby International Ab

Parametric reconstruction of audio signals

An encoding system (400) encodes an n-channel audio signal (x), wherein n≥3, as a single-channel downmix signal (y) together with dry and wet upmix parameters ({tilde over (c)}, {tilde over (p)}). In a decoding system (200), a decorrelating section (101) outputs, based on the downmix signal, an (n−1)-channel decorrelated signal (z); a dry upmix section (102) maps the downmix signal linearly in accordance with dry upmix coefficients (c) determined based on the dry upmix parameters; a wet upmix section (103) populates an intermediate matrix based on the wet upmix parameters and knowing that the intermediate matrix belongs to a predefined matrix class, obtains wet upmix coefficients (p) by multiplying the intermediate matrix by a predefined matrix, and maps the decorrelated signal linearly in accordance with the wet upmix coefficients; and a combining section (104) combines outputs from the upmix sections to obtain a reconstructed signal ({circumflex over (x)}) corresponding to the signal to be reconstructed.. ... Dolby International Ab

Layered coding and data structure for compressed higher-order ambisonics sound or sound field representations

The present document relates to a method of layered encoding of a frame of a compressed higher-order ambisonics, hoa, representation of a sound or sound field. The compressed hoa representation comprises a plurality of transport signals. ... Dolby International Ab

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. ... Dolby International Ab

Method for frame-wise combined decoding and rendering of a compressed hoa signal and apparatus for frame-wise combined decoding and rendering of a compressed hoa signal

Higher order ambisonics (hoa) signals can be compressed by decomposition into a predominant sound component and a residual ambient component. The compressed representation comprises pre-dominant sound signals, coefficient sequences of the ambient component and side information. ... Dolby International Ab

Audio decoder and decoding method

A method for representing a second presentation of audio channels or objects as a data stream, the method comprising the steps of: (a) providing a set of base signals, the base signals representing a first presentation of the audio channels or objects; (b) providing a set of transformation parameters, the transformation parameters intended to transform the first presentation into the second presentation; the transformation parameters further being specified for at least two frequency bands and including a set of multi-tap convolution matrix parameters for at least one of the frequency bands.. . ... Dolby International Ab

Implicit signaling of scalability dimension identifier information in a parameter set

A system for decoding a video bitstream includes receiving a frame of the video that includes at least one slice and at least one tile and where each of the at least one slice and the at least one tile are not all aligned with one another.. . ... Dolby International Ab

Method and apparatus for generating from an hoa signal representation a mezzanine hoa signal representation

From an hoa signal representation (c(t)) of a sound field having an order of n and a number 0=(n+1)2 of coefficient sequences a mezzanine hoa signal representation (wmezz(t)) is generated that consists of an arbitrary number i<0 of virtual loudspeaker signals wmezz1(t), wmezz,2(t), . . ... Dolby International Ab

Low bit rate parametric encoding and transport of haptic-tactile signals

Techniques for low bit rate parametric encoding of haptic-tactile signals. The techniques encompass a parametric encoding method. ... Dolby International Ab

Advanced quantizer

The present document relates an audio encoding and decoding system (referred to as an audio codec system). In particular, the present document relates to a transform-based audio codec system which is particularly well suited for voice encoding/decoding. ... Dolby International Ab

Method for performing audio restauration, and apparatus for performing audio restauration

A method for performing audio inpainting, wherein missing portions in an input audio signal are recovered and a recovered audio signal is obtained, comprises computing a short-time fourier transform (stft) on portions of the input audio signal, computing conditional expectations of the source power spectra of the input audio signal, wherein estimated source power spectra p(f, n, j) are obtained and wherein the variance tensor v and complex short-time fourier transform (stft) coefficients of the input audio signals are used, iteratively re-calculating the variance tensor v from the estimated power spectra p(f, n, j) and re-calculating updated estimated power spectra p(f, n, j), computing an array of stft coefficients Ⓢ from the resulting variance tensor v according to Ⓢ(f, n, j)=e{s(f, n, j). . ... Dolby International Ab

Video decoder with reduced dynamic range transform with inverse transform shifting memory

A method for decoding video includes receiving quantized coefficients representative of a block of video representative of a plurality of pixels. The quantized coefficients are dequantized based upon a function of a remainder. ... Dolby International Ab

07/05/18 / #20180192055

Nested entropy encoding

Methods and systems for improving coding decoding efficiency of video by providing a syntax modeler, a buffer, and a decoder. The syntax modeler may associate a first sequence of symbols with syntax elements. ... Dolby International Ab

06/28/18 / #20180182404

Cross product enhanced subband block based harmonic transposition

The invention provides an efficient implementation of cross-product enhanced high-frequency reconstruction (hfr), wherein a new component at frequency qΩ+rΩ0 is generated on the basis of existing components at Ω and Ω+Ω0. The invention provides a block-based harmonic transposition, wherein a time block of complex subband samples is processed with a common phase modification. ... Dolby International Ab

06/28/18 / #20180182402

Method and apparatus for encoding/decoding of directions of dominant directional signals within subbands of a hoa signal representation

Encoding of higher order ambisonics (hoa) signals commonly results in high data rates. For data rate reduction, a method (100) for encoding direction information for frames of an input hoa signal comprises determining (s101) active candidate directions (i) among predefined global directions having global direction indices, dividing (s102) the input hoa signal into frequency subbands (ii), determining (s103) for each frequency subband active subband directions among the active candidate directions, assigning (s104) a relative direction index to each direction per subband, assembling (s105) direction information for the frame, the direction information comprising the active candidate directions (i), for each subband and each active candidate direction a bit indicating whether or not the active candidate direction is an active subband direction for the respective frequency subband, and for each frequency subband the relative direction indices of active subband directions in the second set of subband directions, and transmitting (s106) the assembled direction information.. ... Dolby International Ab

06/21/18 / #20180176606

Methods, devices and systems for parallel video encoding and decoding

A method for decoding a video bitstream is disclosed. The method comprises: entropy decoding a first portion of a video bitstream, wherein first portion of video bitstream is associated with a video frame, thereby producing a first portion of decoded data; entropy decoding a second portion of video bitstream, wherein second portion of video bitstream is associated with video frame, thereby producing a second portion of decoded data, wherein entropy decoding second portion of video bitstream is independent of entropy decoding first portion of video bitstream; and reconstructing a first portion of video frame associated with video bitstream using first portion of decoded data and second portion of decoded data.. ... Dolby International Ab

06/14/18 / #20180167756

Rendering of audio objects with apparent size to arbitrary loudspeaker layouts

Multiple virtual source locations may be defined for a volume within which audio objects can move. A set-up process for rendering audio data may involve receiving reproduction speaker location data and pre-computing gain values for each of the virtual sources according to the reproduction speaker location data and each virtual source location. ... Dolby International Ab

06/14/18 / #20180167628

Signaling scalability information in a parameter set

A system for decoding a video bitstream includes receiving a frame of the video that includes at least one slice and at least one tile and where each of the at least one slice and the at least one tile are not all aligned with one another.. . ... Dolby International Ab

06/07/18 / #20180160249

Method and apparatus for decoding stereo loudspeaker signals from a higher-order ambisonics audio signal

Decoding of ambisonics representations for a stereo loudspeaker setup is known for first-order ambisonics audio signals. But such first-order ambisonics approaches have either high negative side lobes or poor localisation in the frontal region. ... Dolby International Ab

06/07/18 / #20180160236

Dialog enhancement complemented with frequency transposition

A method, a system and a computer program product are disclosed for enhancing an audio signal in relation to a hearing impairment. An input signal is obtained comprising input sub-band signals in a frequency range comprising a source range and a target range. ... Dolby International Ab

05/31/18 / #20180151186

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.. ... Dolby International Ab

05/24/18 / #20180146288

Digital filterbank for spectral envelope adjustment

An apparatus and method are disclosed for processing an audio signal. The apparatus includes an input interface, a digital filterbank having an analysis part and a synthesis part, a first phase shifter, a spectral envelope adjuster, a second phase shifter, and an output interface. ... Dolby International Ab

05/24/18 / #20180144753

Processing of audio signals during high frequency reconstruction

The application relates to hfr (high frequency reconstruction/regeneration) of audio signals. In particular, the application relates to a method and system for performing hfr of audio signals having large variations in energy level across the low frequency range which is used to reconstruct the high frequencies of the audio signal. ... Dolby International Ab

05/24/18 / #20180144751

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. ... Dolby International Ab

05/17/18 / #20180139559

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.. ... Dolby International Ab

05/17/18 / #20180139558

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.. ... Dolby International Ab

05/17/18 / #20180139535

Action sound capture using subsurface microphones

Methods and systems for generating an audio mix indicative of action sound captured at an event on a surface (e.g., a sporting event on a field) using a microphone array, where the array includes subsurface microphones (e.g., a large number of sub-surface microphones) positioned under the surface, and optionally also other microphones. In typical embodiments, at least one point of interest (“pi”) on the surface is selected in an automated manner, pi data indicative of a currently selected pi on the surface is generated (e.g., a sequence of pis on the surface is selected, the pi data is indicative of the sequence of pis, and a most recently selected pi in the sequence is the currently selected pi), and the audio mix is generated in response to the pi data. ... Dolby International Ab

05/10/18 / #20180132051

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.. ... Dolby International Ab

05/10/18 / #20180130480

Audio coding with range extension

Disclosed are some examples of systems, apparatus, methods and computer program products implementing techniques for extending the range of a set of decoded parameter values for a sequence of frequency bands in an identifiable time frame of an audio signal. In some implementations, the parameter values vary in relation to a sequence of time frames of the audio signal and in relation to a sequence of frequency bands in each time frame. ... Dolby International Ab

04/19/18 / #20180109898

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.. ... Dolby International Ab

04/19/18 / #20180109897

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.. ... Dolby International Ab

04/19/18 / #20180108366

Model based prediction in a critically sampled filterbank

The present document relates to audio source coding systems. In particular, the present document relates to audio source coding systems which make use of linear prediction in combination with a filterbank. ... Dolby International Ab

04/19/18 / #20180108364

Coding of multichannel audio content

There are provided decoding and encoding methods for encoding and decoding of multichannel audio content for playback on a speaker configuration with n channels. The decoding method comprises decoding, in a first decoding module, m input audio signals into m mid signals which are suitable for playback on a speaker configuration with m channels; and for each of the n channels in excess of m channels, receiving an additional input audio signal corresponding to one of the m mid signals and decoding the input audio signal and its corresponding mid signal so as to generate a stereo signal including a first and a second audio signal which are suitable for playback on two of the n channels of the speaker configuration.. ... Dolby International Ab

04/05/18 / #20180098170

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.. ... Dolby International Ab

04/05/18 / #20180098169

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.. ... Dolby International Ab

04/05/18 / #20180096692

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. ... Dolby International Ab

04/05/18 / #20180095718

System and method for optimizing loudness and dynamic range across different playback devices

Embodiments are directed to a method and system for receiving, in a bitstream, metadata associated with the audio data, and analyzing the metadata to determine whether a loudness parameter for a first group of audio playback devices are available in the bitstream. Responsive to determining that the parameters are present for the first group, the system uses the parameters and audio data to render audio. ... Dolby International Ab

03/29/18 / #20180091914

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.. ... Dolby International Ab

03/22/18 / #20180082698

Method for reduction of aliasing introduced by spectral envelope adjustment in real-valued filterbanks

The present invention proposes a new method for improving the performance of a real-valued filterbank based spectral envelope adjuster. By adaptively locking the gain values for adjacent channels dependent on the sign of the channels, as defined in the application, reduced aliasing is achieved. ... Dolby International Ab

03/22/18 / #20180082695

Adaptive arithmetic coding of audio content

Disclosed is a system and computer program product of encoding audio content and corresponding method. The method includes determining a characteristic of the audio content, the characteristic of the audio content including at least one of a type or a property of the audio content. ... Dolby International Ab

03/15/18 / #20180075865

Subband block based harmonic transposition

The present document relates to audio source coding systems which make use of a harmonic transposition method for high frequency reconstruction (hfr), as well as to digital effect processors, e.g. Exciters, where generation of harmonic distortion add brightness to the processed signal, and to time stretchers where a signal duration is prolonged with maintained spectral content. ... Dolby International Ab

03/01/18 / #20180063541

Image decoding device and image coding device

A reference picture information decoding unit (13) omits decoding of a reference list sorting presence or absence flag and/or a reference list sorting order based on the number of current picture referable pictures.. . ... Dolby International Ab

03/01/18 / #20180061427

Method for reduction of aliasing introduced by spectral envelope adjustment in real-valued filterbanks

The present invention proposes a new method for improving the performance of a real-valued filterbank based spectral envelope adjuster. By adaptively locking the gain values for adjacent channels dependent on the sign of the channels, as defined in the application, reduced aliasing is achieved. ... Dolby International Ab

02/22/18 / #20180053517

Method for reduction of aliasing introduced by spectral envelope adjustment in real-valued filterbanks

The present invention proposes a new method for improving the performance of a real-valued filterbank based spectral envelope adjuster. By adaptively locking the gain values for adjacent channels dependent on the sign of the channels, as defined in the application, reduced aliasing is achieved. ... Dolby International Ab

02/22/18 / #20180053516

Method for reduction of aliasing introduced by spectral envelope adjustment in real-valued filterbanks

The present invention proposes a new method for improving the performance of a real-valued filterbank based spectral envelope adjuster. By adaptively locking the gain values for adjacent channels dependent on the sign of the channels, as defined in the application, reduced aliasing is achieved. ... Dolby International Ab

02/22/18 / #20180053515

Methods and systems for generating and interactively rendering object based audio

Methods for generating an object based audio program, renderable in a personalizable manner, and including a bed of speaker channels renderable in the absence of selection of other program content (e.g., to provide a default full range audio experience). Other embodiments include steps of delivering, decoding, and/or rendering such a program. ... Dolby International Ab

02/15/18 / #20180047411

Oversampling in a combined transposer filterbank

The present invention relates to coding of audio signals, and in particular to high frequency reconstruction methods including a frequency domain harmonic transposer. A system and method for generating a high frequency component of a signal from a low frequency component of the signal is described. ... Dolby International Ab

02/15/18 / #20180047405

Pitch filter for audio signals

In some embodiments, a pitch filter for filtering a preliminary audio signal generated from an audio bitstream is disclosed. The pitch filter has an operating mode selected from one of either: (i) an active mode where the preliminary audio signal is filtered using filtering information to obtain a filtered audio signal, and (ii) an inactive mode where the pitch filter is disabled. ... Dolby International Ab

02/01/18 / #20180033446

Cross product enhanced harmonic transposition

The present invention relates to audio coding systems which make use of a harmonic transposition method for high frequency reconstruction (hfr). A system and a method for generating a high frequency component of a signal from a low frequency component of the signal is described. ... Dolby International Ab

02/01/18 / #20180033441

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. ... Dolby International Ab

01/25/18 / #20180025739

Time-alignment of qmf based processing data

The present document relates to time-alignment of encoded data of an audio encoder with associated metadata, such as spectral band replication (sbr) metadata. An audio decoder configured to determine a reconstructed frame of an audio signal from an access unit of a received data stream is described. ... Dolby International Ab

01/25/18 / #20180025738

Decoding audio bitstreams with enhanced spectral band replication metadata in at least one fill element

Embodiments relate to an audio processing unit that includes a buffer, bitstream payload deformatter, and a decoding subsystem. The buffer stores at least one block of an encoded audio bitstream. ... Dolby International Ab

01/25/18 / #20180025737

Decoding audio bitstreams with enhanced spectral band replication metadata in at least one fill element

Embodiments relate to an audio processing unit that includes a buffer, bitstream payload deformatter, and a decoding subsystem. The buffer stores at least one block of an encoded audio bitstream. ... Dolby International Ab

01/11/18 / #20180012609

Transmission-agnostic presentation-based program loudness

This disclosure falls into the field of audio coding, in particular it is related to the field of providing a framework for providing loudness consistency among differing audio output signals. In particular, the disclosure relates to methods, computer program products and apparatus for encoding and decoding of audio data bitstreams in order to attain a desired loudness level of an output audio signal.. ... Dolby International Ab

12/28/17 / #20170374485

Method and apparatus for higher order ambisonics encoding and decoding using singular value decomposition

The encoding and decoding of hoa signals using singular value decomposition includes forming based on sound source direction values and an ambisonics order corresponding ket vectors (. . ... Dolby International Ab

12/28/17 / #20170373857

Metadata transcoding

The present document relates to transcoding of metadata, and in particular to a method and system for transcoding metadata with reduced computational complexity. A transcoder configured to transcode an inbound bitstream comprising an inbound content frame and an associated inbound metadata frame into an outbound bitstream comprising an outbound content frame and an associated outbound metadata frame is described. ... Dolby International Ab

12/28/17 / #20170372707

Mdct-domain error concealment

An error-concealing audio decoding method comprises: receiving a packet comprising a set of mdct coefficients encoding a frame of time-domain samples of an audio signal; identifying the received packet as erroneous; generating estimated mdct coefficients to replace the set of mdct coefficients of the erroneous packet, based on corresponding mdct coefficients associated with a received packet directly preceding the erroneous packet; assigning signs of a first subset of mdct coefficients of the estimated mdct coefficients, wherein the first subset comprises such mdct coefficients that are associated with tonal-like spectral bins, to coincide with signs of corresponding mdct coefficients of said preceding packet; randomly assigning signs of a second subset of mdct coefficients of the estimated mdct coefficients, wherein the second subset comprises mdct coefficients associated with noise-like spectral bins; replacing the erroneous packet by a concealment packet containing the estimated mdct coefficients and the signs assigned.. . ... Dolby International Ab

12/07/17 / #20170353810

Adaptive panner of audio objects

. . An audio object including audio content and object metadata is received. The object metadata indicates an object spatial position of the audio object to be rendered by audio speakers in a playback environment. ... Dolby International Ab

11/30/17 / #20170345432

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, and offers significantly reduced computational complexity. ... Dolby International Ab

11/23/17 / #20170339505

Parametric encoding and decoding of multichannel audio signals

A control section (1009) receives signaling (s) indicating one of at least two coding formats (f1, f2, f3) of an m-channel audio signal (l, ls, lb, tfl, tbl), the coding formats corresponding to different partitions of the channels of the audio signal into respective first and second groups (601, 602), wherein, in the indicated coding format, first and second channels (l1, l2) of a downmix signal correspond to linear combinations of the first and second groups, respectively; and a decoding section (900) reconstructs the audio signal based on the downmix signal and associated upmix parameters (αl). In the decoding section: a decorrelation input signal (d1, d2, d3) is determined based on the downmix signal and the indicated coding format; and wet and dry upmix coefficients, controlling linear mappings of the downmix signal and a decorrelated signal, generated based on the decorrelation input signal, are determined based on the upmix parameters and the indicated coding format.. ... Dolby International Ab

11/16/17 / #20170332185

Parametric mixing of audio signals

In an encoding section (100), a downmix section (110) forms first and second channels (l1, l2) of a downmix signal as linear combinations of first and second groups (401, 402) of channels, respectively, of an m-channel audio signal; and an analysis section (120) determines upmix parameters (αlu) for parametric reconstruction of the audio signal, and mixing parameters (αlm). In a decoding section (1200), a decorrelating section (1210) outputs a decorrelated signal (d) based on the downmix signal; and a mixing section (1220) determines mixing coefficients based on the mixing parameters or the upmix parameters, and forms a k-channel output signal ({tilde over (l)}1, . ... Dolby International Ab

11/16/17 / #20170332102

Golomb-rice/eg coding technique for cabac in hevc

A system utilizing a high throughput coding mode for cabac in hevc is described. The system may include an electronic device configured to obtain a block of data to be encoded using an arithmetic based encoder; to generate a sequence of syntax elements using the obtained block; to compare an absolute-3 value of the sequence or a parameter associated with the absolute-3 value to a preset value; and to convert the absolute-3 value to a codeword using a first code or a second code that is different than the first code, according to a result of the comparison.. ... Dolby International Ab

11/16/17 / #20170329849

Indexing variable bit stream audio formats

Methods, systems, and apparatus, including computer programs encoded on computer storage media, for index variable bit stream audio files. One of the methods includes repeatedly receiving audio frames of a variable bit rate representation of an audio signal, wherein the variable bit rate representation comprises multiple portions that each represent one or more audio samples of the audio signal, and wherein at least two of the multiple portions have different respective bit rates. ... Dolby International Ab

10/26/17 / #20170311107

Loudness adjustment for downmixed audio content

. . Audio content coded for a reference speaker configuration is downmixed to downmix audio content coded for a specific speaker configuration. One or more gain adjustments are performed on individual portions of the downmix audio content coded for the specific speaker configuration. ... Dolby International Ab

10/26/17 / #20170309295

Subband block based harmonic transposition

The present document relates to audio source coding systems which make use of a harmonic transposition method for high frequency reconstruction (hfr), as well as to digital effect processors, e.g. Exciters, where generation of harmonic distortion add brightness to the processed signal, and to time stretchers where a signal duration is prolonged with maintained spectral content. ... Dolby International Ab

10/26/17 / #20170309288

Decoding method and decoder for dialog enhancement

There is provided a method for enhancing dialog in a decoder of an audio system. The method comprises receiving a plurality of downmix signals being a downmix of a larger plurality of channels; receiving parameters for dialog enhancement being defined with respect to a subset of the plurality of channels that is downmixed into a subset of the plurality of downmix signals; upmixing the subset of downmix signals parametrically in order to reconstruct the subset of the plurality of channels with respect to which the parameters for dialog enhancement are defined; applying dialog enhancement to the subset of the plurality of channels with respect to which the parameters for dialog enhancement are defined using the parameters for dialog enhancement to provide at least one dialog enhanced signal; and subjecting the at least one dialog enhanced signal to mixing to provide dialog enhanced versions of the subset of downmix signals.. ... Dolby International Ab

10/26/17 / #20170309281

Methods and devices for joint multichannel coding

Encoding and decoding devices for encoding the channels of an audio system having at least four channels are disclosed. The decoding device has a first stereo decoding component which subjects a first pair of input channels to a first stereo decoding, and a second stereo decoding component which subjects a second pair of input channels to a second stereo decoding. ... Dolby International Ab

10/26/17 / #20170309280

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. ... Dolby International Ab

10/26/17 / #20170309279

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. ... Dolby International Ab

10/05/17 / #20170289724

Rendering audio objects in a reproduction environment that includes surround and/or height speakers

During a process, decorrelation may be selectively applied to audio data for an audio object based, at least in part, on whether a speaker for which speaker feed signals will be determined is a surround speaker. In some implementations, decorrelation may be selectively applied according to whether such a speaker is a height speaker. ... Dolby International Ab

10/05/17 / #20170289549

Nested entropy encoding

Methods and systems for improving coding decoding efficiency of video by providing a syntax modeler, a buffer, and a decoder. The syntax modeler may associate a first sequence of symbols with syntax elements. ... Dolby International Ab

09/28/17 / #20170280264

Adaptive panner of audio objects

An audio object including audio content and object metadata is received. The object metadata indicates an object spatial position of the audio object to be rendered by audio speakers in a playback environment. ... Dolby International Ab

09/28/17 / #20170280149

Method of coding and decoding images, coding and decoding device and computer programs corresponding thereto

A method is provided for coding at least one image split up into partitions, a current partition to be coded containing data, at least one data item of which is allotted a sign. The coding method includes, for the current partition, the following steps: calculating the value of a function representative of the data of the current partition with the exclusion of the sign; comparing the calculated value with a predetermined value of the sign; as a function of the result of the comparison, modifying or not modifying at least one of the data items of the current partition, in the case of modification, coding the at least one modified data item.. ... Dolby International Ab

09/21/17 / #20170272885

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.. ... Dolby International Ab

09/21/17 / #20170272866

Force balanced micro transducer array

Embodiments are directed to a micro transducer array comprising a shared motor system having a base plate and mounting interfaces to a frame of a portable electronic device; a first transducer comprising a first magnet disposed between the base plate and a first top plate, and a first diaphragm projecting sound out of a surface of the portable device; a second transducer comprising a second magnet disposed between the base plate and a second top plate, and a second diaphragm projecting sound of an opposite surface of the portable device; a first pair of input terminals inputting a first audio signal to the first transducer; and a second pair of input terminals inputting a second audio signal to the second transducer.. . ... Dolby International Ab

09/21/17 / #20170270939

Efficient sample rate conversion

A method (500) for resampling an audio signal (110) is described. The method (500) comprising providing (501) a set of input subband signals (210) which is representative of a time domain audio signal. ... Dolby International Ab

09/14/17 / #20170264271

Complex exponential modulated filter bank for high frequency reconstruction or parametric stereo

An apparatus and method are disclosed for filtering an audio signal. The apparatus includes an analysis filter bank, a phase shifter, a high frequency reconstructor or parametric stereo processor, and a synthesis filter bank. ... Dolby International Ab

09/14/17 / #20170262409

Complex exponential modulated filter bank for high frequency reconstruction or parametric stereo

An apparatus and method are disclosed for filtering an audio signal. The apparatus includes a high frequency reconstructor or parametric stereo processor, a phase shifter, and a synthesis filter bank. ... Dolby International Ab

08/31/17 / #20170251321

Insertion of sound objects into a downmixed audio signal

A method for inserting a first audio signal into a bitstream which comprises a downmix signal and associated bitstream metadata is described. The downmix signal and associated bitstream metadata are indicative of an audio program comprising a plurality of spatially diverse audio signals. ... Dolby International Ab

08/31/17 / #20170251298

Overhead speaker system

There is provided a sound system comprising: a first reflector arranged overhead and to reflect sound into a listening environment, a sound emitting device comprising a sound source and a second reflector, the sound source being configured to direct a sound beam with a first beam angle into the second reflector, the sound emitting device being any of a horn or parabolic loudspeaker. The second reflector is shaped to reflect the sound beam with a second beam angle towards the first reflector, and the first reflector is shaped such as it reflects the sound beam back to the listening environment with a third beam angle. ... Dolby International Ab

08/31/17 / #20170249951

Transmission-agnostic presentation-based program loudness

This disclosure falls into the field of audio coding, in particular it is related to the field of providing a framework for providing loudness consistency among differing audio output signals. In particular, the disclosure relates to methods, computer program products and apparatus for encoding and decoding of audio data bitstreams in order to attain a desired loudness level of an output audio signal.. ... Dolby International Ab

08/31/17 / #20170249950

Efficient drc profile transmission

A method for decoding an encoded audio signal is described. The encoded audio signal comprises a sequence of frames, and is indicative of a plurality of different dynamic range control (drc) profiles for a corresponding plurality of different rendering modes. ... Dolby International Ab

08/31/17 / #20170249945

Audio encoder and decoder

This disclosure falls into the field of audio coding, in particular it is related to the field of spatial audio coding, where the audio information is represented by multiple audio objects including at least one dialog object. In particular the disclosure provides a method and apparatus for enhancing dialog in a decoder in an audio system. ... Dolby International Ab

08/24/17 / #20170243595

Encoding and decoding of audio signals

An audio signal (x) is represented by a bitstream (b) segmented into frames. An audio processing system (500) comprises a buffer (510) and a decoding section (520). ... Dolby International Ab

08/24/17 / #20170243593

Method for reduction of aliasing introduced by spectral envelope adjustment in real-valued filterbanks

The present invention proposes a new method for improving the performance of a real-valued filterbank based spectral envelope adjuster. By adaptively locking the gain values for adjacent channels dependent on the sign of the channels, as defined in the application, reduced aliasing is achieved. ... Dolby International Ab

08/24/17 / #20170243592

Method and apparatus for coding or decoding subband configuration data for subband groups

For an efficient encoding of subband configuration data the first, penultimate and last subband groups are treated differently than the other subband groups. Further, subband group bandwidth difference values are used in the encoding. ... Dolby International Ab

08/24/17 / #20170243590

Smart access to personalized audio

A method (600) for generating a bitstream (500) indicative of an object based audio program is described. The bitstream (500) comprises a sequence of containers (501). ... Dolby International Ab

08/24/17 / #20170243589

Method and apparatus for low bit rate compression of a higher order ambisonics hoa signal representation of a sound field

The invention is suited for improving a low bit rate compressed and decompressed higher order ambisonics hoa signal representation of a sound field, wherein the decompression provides a spatially sparse decoded hoa representation and a set of indices of coefficient sequences of this representation. From reconstructed signals of the original hoa representation a number of modified phase spectra signals are created using de-correlation filters, which modified phase spectra signals are uncorrelated with the signals of said original representation. ... Dolby International Ab

08/17/17 / #20170238208

Non-uniform parameter quantization for advanced coupling

The present disclosure provides methods, devices and computer program products for non-uniform quantization of parameters relating to parametric spatial coding of audio signals. The disclosure further relates to a method and apparatus for reconstructing an audio object in an audio decoding system taking the non-uniformly quantized parameters into account. ... Dolby International Ab

08/17/17 / #20170238116

Rendering of audio objects with apparent size to arbitrary loudspeaker layouts

Multiple virtual source locations may be defined for a volume within which audio objects can move. A set-up process for rendering audio data may involve receiving reproduction speaker location data and pre-computing gain values for each of the virtual sources according to the reproduction speaker location data and each virtual source location. ... Dolby International Ab

08/17/17 / #20170238113

Audio decoder for audio channel reconstruction

A method performed by an audio decoder for reconstructing n audio channels from an audio signal containing m audio channels is disclosed. The method includes receiving a bitstream containing an encoded audio signal having m audio channels and a set of spatial parameters, the set of spatial parameters including an inter-channel intensity difference parameter and an inter-channel coherence parameter. ... Dolby International Ab

08/17/17 / #20170238112

Audio decoder for audio channel reconstruction

A method performed by an audio decoder for reconstructing n audio channels from an audio signal containing m audio channels is disclosed. The method includes receiving a bitstream containing an encoded audio signal having m audio channels and a set of spatial parameters, the set of spatial parameters including an inter-channel intensity difference parameter and an inter-channel coherence parameter. ... Dolby International Ab

08/17/17 / #20170238094

Complex exponential modulated filter bank for high frequency reconstruction or parametric stereo

An apparatus and method are disclosed for filtering an audio signal are disclosed. The apparatus includes an analysis filter bank, a high frequency reconstructor or a parametric stereo processor, and a synthesis filter bank. ... Dolby International Ab

08/17/17 / #20170236523

Audio decoder for audio channel reconstruction

A method performed by an audio decoder for reconstructing n audio channels from an audio signal containing m audio channels is disclosed. The method includes receiving a bitstream containing an encoded audio signal having m audio channels and a set of spatial parameters, the set of spatial parameters including an inter-channel intensity difference parameter and an inter-channel coherence parameter. ... Dolby International Ab

08/10/17 / #20170229132

Audio decoder for audio channel reconstruction

A method performed by an audio decoder for reconstructing n audio channels from an audio signal containing m audio channels is disclosed. The method includes receiving a bitstream containing an encoded audio signal having m audio channels and a set of spatial parameters, the set of spatial parameters including an inter-channel intensity difference parameter and an inter-channel coherence parameter. ... Dolby International Ab

08/10/17 / #20170229131

Audio decoder for audio channel reconstruction

A method performed by an audio decoder for reconstructing n audio channels from an audio signal containing m audio channels is disclosed. The method includes receiving a bitstream containing an encoded audio signal having m audio channels and a set of spatial parameters, the set of spatial parameters including an inter-channel intensity difference parameter and an inter-channel coherence parameter. ... Dolby International Ab

08/10/17 / #20170229130

Audio decoder for audio channel reconstruction

A method performed by an audio decoder for reconstructing n audio channels from an audio signal containing m audio channels is disclosed. The method includes receiving a bitstream containing an encoded audio signal having m audio channels and a set of spatial parameters, the set of spatial parameters including an inter-channel intensity difference parameter and an inter-channel coherence parameter. ... Dolby International Ab

08/10/17 / #20170229129

Audio decoder for audio channel reconstruction

A method performed by an audio decoder for reconstructing n audio channels from an audio signal containing m audio channels is disclosed. The method includes receiving a bitstream containing an encoded audio signal having m audio channels and a set of spatial parameters, the set of spatial parameters including an inter-channel intensity difference parameter and an inter-channel coherence parameter. ... Dolby International Ab

08/10/17 / #20170229128

Audio decoder for audio channel reconstruction

A method performed by an audio decoder for reconstructing n audio channels from an audio signal containing m audio channels is disclosed. The method includes receiving a bitstream containing an encoded audio signal having m audio channels and a set of spatial parameters, the set of spatial parameters including an inter-channel intensity difference parameter and an inter-channel coherence parameter. ... Dolby International Ab

08/10/17 / #20170229127

Audio decoder for audio channel reconstruction

A method performed by an audio decoder for reconstructing n audio channels from an audio signal containing m audio channels is disclosed. The method includes receiving a bitstream containing an encoded audio signal having m audio channels and a set of spatial parameters, the set of spatial parameters including an inter-channel intensity difference parameter and an inter-channel coherence parameter. ... Dolby International Ab

08/10/17 / #20170229126

Audio decoder for audio channel reconstruction

A method performed by an audio decoder for reconstructing n audio channels from an audio signal containing m audio channels is disclosed. The method includes receiving a bitstream containing an encoded audio signal having m audio channels and a set of spatial parameters, the set of spatial parameters including an inter-channel intensity difference parameter and an inter-channel coherence parameter. ... Dolby International Ab

08/03/17 / #20170223385

Methods, devices and systems for parallel video encoding and decoding

A method for decoding a video bitstream is disclosed. The method comprises: entropy decoding a first portion of a video bitstream, wherein first portion of video bitstream is associated with a video frame, thereby producing a first portion of decoded data; entropy decoding a second portion of video bitstream, wherein second portion of video bitstream is associated with video frame, thereby producing a second portion of decoded data, wherein entropy decoding second portion of video bitstream is independent of entropy decoding first portion of video bitstream; and reconstructing a first portion of video frame associated with video bitstream using first portion of decoded data and second portion of decoded data.. ... Dolby International Ab

08/03/17 / #20170223353

Method of coding and decoding images, coding and decoding device and computer programs corresponding thereto

A method for coding includes; segmenting an image into blocks; grouping blocks into a number of subsets; coding, using an entropy coding module, each subset, by associating digital information with symbols of each block of a subset, including, for the first block of the image, initializing state variables of the coding module; and generating a data sub-stream representative of at least one of the coded subsets of blocks. Where a current block is the first block to be coded of a subset, symbol occurrence probabilities for the first current block are determined based on those for a coded and decoded predetermined block of at least one other subset. ... Dolby International Ab

08/03/17 / #20170221492

Model based prediction in a critically sampled filterbank

The present document relates to audio source coding systems. In particular, the present document relates to audio source coding systems which make use of linear prediction in combination with a filterbank. ... Dolby International Ab

08/03/17 / #20170221491

Methods and systems for efficient recovery of high frequency audio content

The present document relates to the technical field of audio coding, decoding and processing. It specifically relates to methods of recovering high frequency content of an audio signal from low frequency content of the same audio signal in an efficient manner. ... Dolby International Ab

08/03/17 / #20170221489

Coding of multichannel audio content

There are provided decoding and encoding methods for encoding and decoding of multichannel audio content for playback on a speaker configuration with n channels. The decoding method comprises decoding, in a first decoding module, m input audio signals into m mid signals which are suitable for playback on a speaker configuration with m channels; and for each of the n channels in excess of m channels, receiving an additional input audio signal corresponding to one of the m mid signals and decoding the input audio signal and its corresponding mid signal so as to generate a stereo signal including a first and a second audio signal which are suitable for playback on two of the n channels of the speaker configuration.. ... Dolby International Ab

07/27/17 / #20170214925

Implicit signaling of scalability dimension identifier information in a parameter set

A system for decoding a video bitstream includes receiving a frame of the video that includes at least one slice and at least one tile and where each of the at least one slice and the at least one tile are not all aligned with one another.. . ... Dolby International Ab

07/27/17 / #20170213563

Cross product enhanced subband block based harmonic transposition

The invention provides an efficient implementation of cross-product enhanced high-frequency reconstruction (hfr), wherein a new component at frequency qΩ+rΩ0 is generated on the basis of existing components at Ω and Ω+Ω0. The invention provides a block-based harmonic transposition, wherein a time block of complex subband samples is processed with a common phase modification. ... Dolby International Ab

07/20/17 / #20170208410

Method and apparatus for decoding stereo loudspeaker signals from a higher-order ambisonics audio signal

Decoding of ambisonics representations for a stereo loudspeaker setup is known for first-order ambisonics audio signals. But such first-order ambisonics approaches have either high negative side lobes or poor localisation in the frontal region. ... Dolby International Ab

07/20/17 / #20170206911

Complex exponential modulated filter bank for high frequency reconstruction or parametric stereo

An apparatus and method are disclosed for filtering and performing high frequency reconstruction of an audio signal. The apparatus includes an analysis filter bank, a phase shifter, a high frequency reconstructor, and a synthesis filter bank. ... Dolby International Ab

07/20/17 / #20170206910

Complex exponential modulated filter bank for high frequency reconstruction or parametric stereo

An apparatus and method are disclosed for filtering and performing high frequency reconstruction of an audio signal. The apparatus includes an analysis filter bank, a phase shifter, a high frequency reconstructor, and a synthesis filter bank. ... Dolby International Ab

07/06/17 / #20170195819

Configuring playback of audio via a home audio playback system

Method and apparatus is described relating to configuring playback of audio via a home audio playback system. The method relates to a graphical user interface, where the graphical user interface comprises a positioning area. ... Dolby International Ab

07/06/17 / #20170194942

Complex exponential modulated filter bank for high frequency reconstruction

An apparatus and method are disclosed for filtering and performing high frequency reconstruction of an audio signal. The apparatus includes an analysis filter bank, a phase shifter, a high frequency reconstructor, and a synthesis filter bank. ... Dolby International Ab

07/06/17 / #20170194011

Apparatus and method for processing an input audio signal using cascaded filterbanks

An apparatus for processing an input audio signal relies on a cascade of filterbanks, the cascade having a synthesis filterbank for synthesizing an audio intermediate signal from the input audio signal, the input audio signal being represented by a plurality of first subband signals generated by an analysis filterbank, wherein a number of filterbank channels of the synthesis filterbank is smaller than a number of channels of the analysis filterbank. The apparatus furthermore has a further analysis filterbank for generating a plurality of second subband signals from the audio intermediate signal, wherein the further analysis filterbank has a number of channels being different from the number of channels of the synthesis filterbank, so that a sampling rate of a subband signal of the plurality of second subband signals is different from a sampling rate of a first subband signal of the plurality of first subband signals.. ... Dolby International Ab

06/29/17 / #20170186437

Efficient and scalable parametric stereo coding for low bitrate 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. ... Dolby International Ab

06/29/17 / #20170186436

Efficient and scalable parametric stereo coding for low bitrate 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. ... Dolby International Ab

06/29/17 / #20170186435

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. ... Dolby International Ab

06/29/17 / #20170186434

Efficient and scalable parametric stereo coding for low bitrate 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. ... Dolby International Ab

06/22/17 / #20170180905

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 decoding method described is for reconstructing audio objects based on a data stream, wherein the data stream corresponds to a plurality of time frames, wherein the data stream comprises a plurality of side information instances, wherein the data stream further comprises, for each side information instance, transition data including two independently assignable portions which in combination define a point in time to begin a transition from a current reconstruction setting to a desired reconstruction setting specified by the side information instance, and a point in time to complete the transition.. ... Dolby International Ab

06/22/17 / #20170180902

Method for compressing a higher order ambisonics (hoa) signal, method for decompressing a compressed hoa signal, apparatus for compressing a hoa signal, and apparatus for decompressing a compressed hoa signal

A method for compressing a hoa signal being an input hoa representation with input time frames (c(k)) of hoa coefficient sequences comprises spatial hoa encoding of the input time frames and subsequent perceptual encoding and source encoding. Each input time frame is decomposed (802) into a frame of predominant sound signals (xps(k−1)) and a frame of an ambient hoa component (camb(k−1)). ... Dolby International Ab

06/22/17 / #20170178665

Processing of audio signals during high frequency reconstruction

The application relates to hfr (high frequency reconstruction/regeneration) of audio signals. In particular, the application relates to a method and system for performing hfr of audio signals having large variations in energy level across the low frequency range which is used to reconstruct the high frequencies of the audio signal. ... Dolby International Ab

06/22/17 / #20170178658

High frequency regeneration of an audio signal with synthetic sinusoid addition

A method performed in an audio decoder for reconstructing an original audio signal having a lowband portion and a highband portion is disclosed. The method includes receiving an encoded audio signal and extracting reconstruction parameters from the encoded audio signal. ... Dolby International Ab

06/22/17 / #20170178657

High frequency regeneration of an audio signal with synthetic sinusoid addition

A method performed in an audio decoder for reconstructing an original audio signal having a lowband portion and a highband portion is disclosed. The method includes receiving an encoded audio signal and extracting reconstruction parameters from the encoded audio signal. ... Dolby International Ab

06/22/17 / #20170178656

High frequency regeneration of an audio signal with synthetic sinusoid addition

A method performed in an audio decoder for reconstructing an original audio signal having a lowband portion and a highband portion is disclosed. The method includes receiving an encoded audio signal and extracting reconstruction parameters from the encoded audio signal. ... Dolby International Ab

06/22/17 / #20170178655

High frequency regeneration of an audio signal with synthetic sinusoid addition

A method performed in an audio decoder for reconstructing an original audio signal having a lowband portion and a highband portion is disclosed. The method includes receiving an encoded audio signal and extracting reconstruction parameters from the encoded audio signal. ... Dolby International Ab

06/22/17 / #20170178654

High frequency regeneration of an audio signal with synthetic sinusoid addition

A method performed in an audio decoder for reconstructing an original audio signal having a lowband portion and a highband portion is disclosed. The method includes receiving an encoded audio signal and extracting reconstruction parameters from the encoded audio signal. ... Dolby International Ab

06/22/17 / #20170178648

Enhanced block switching and bit allocation for improved transform audio coding

The present document relates to methods and apparatus for audio coding. In particular, the present document relates to methods and apparatus for enhanced block switching and/or bit allocation in audio coding of transient-tonal signals. ... Dolby International Ab

06/22/17 / #20170178647

High frequency regeneration of an audio signal with synthetic sinusoid addition

A method performed in an audio decoder for reconstructing an original audio signal having a lowband portion and a highband portion is disclosed. The method includes receiving an encoded audio signal and extracting reconstruction parameters from the encoded audio signal. ... Dolby International Ab

06/22/17 / #20170178646

High frequency regeneration of an audio signal with synthetic sinusoid addition

A method performed in an audio decoder for reconstructing an original audio signal having a lowband portion and a highband portion is disclosed. The method includes receiving an encoded audio signal and extracting reconstruction parameters from the encoded audio signal. ... Dolby International Ab

06/22/17 / #20170178645

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, and offers significantly reduced computational complexity. ... Dolby International Ab

06/22/17 / #20170178644

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, and offers significantly reduced computational complexity. ... Dolby International Ab

06/22/17 / #20170178643

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, and offers significantly reduced computational complexity. ... Dolby International Ab

06/22/17 / #20170178642

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, and offers significantly reduced computational complexity. ... Dolby International Ab

06/22/17 / #20170178641

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, and offers significantly reduced computational complexity. ... Dolby International Ab

06/22/17 / #20170178640

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, and offers significantly reduced computational complexity. ... Dolby International Ab

06/22/17 / #20170178634

Method for compressing a higher order ambisonics signal, method for decompressing (hoa) a compressed hoa signal, apparatus for compressing a hoa signal, and apparatus for decompressing a compressed hoa signal

A method for compressing a hoa signal being an input hoa representation with input time frames (c(k)) of hoa coefficient sequences comprises spatial hoa encoding of the input time frames and subsequent perceptual encoding and source encoding. Each input time frame is decomposed (802) into a frame of predominant sound signals (xps(k−1)) and a frame of an ambient hoa component ({tilde over (c)}amb (k−1)). ... Dolby International Ab

06/15/17 / #20170171682

Method and device for applying dynamic range compression to a higher order ambisonics signal

Dynamic range control (drc) cannot be simply applied to higher order ambisonics (hoa) based signals. A method for performing drc on a hoa signal comprises transforming the hoa signal to the spatial domain, analyzing the transformed hoa signal, and obtaining, from results of said analyzing, gain factors that are usable for dynamic compression. ... Dolby International Ab

06/15/17 / #20170169835

Complex exponential modulated filter bank for high frequency reconstruction

An apparatus and method are disclosed for filtering and performing high frequency reconstruction of an audio signal. The apparatus includes an analysis filter bank, a high frequency reconstructor, and a synthesis filter bank. ... Dolby International Ab

06/08/17 / #20170164132

Method and apparatus for decoding a compressed hoa representation, and method and apparatus for encoding a compressed hoa representation

Encoding of higher order ambisonics (hoa) signals commonly results in high data rates. A method for low bit-rate encoding frames of an input hoa signal having coefficient sequences comprises computing (s110) a truncated hoa representation (ct(k)), determining (s111) active coefficient sequences (ic,actt(k)), estimating (s16) candidate directions (mdir(k)), dividing (s15) the input hoa signal into a plurality of frequency subbands (f1, . ... Dolby International Ab

06/08/17 / #20170164131

Method and apparatus for decoding a compressed hoa representation, and method and apparatus for encoding a compressed hoa representation

Encoding of higher order ambisonics (hoa) signals commonly results in high data rates. A method for low bit-rate encoding frames of an input hoa signal having coefficient sequences comprises computing (s110) a truncated hoa representation (ct(k)), determining (s111) active coefficient sequences (1c,act(k)), estimating (s16) candidate directions (mdir(k)), dividing (s15) the input hoa signal into a plurality of frequency subbands (f1, . ... Dolby International Ab

06/08/17 / #20170164130

Method and apparatus for encoding/decoding of directions of dominant directional signals within subbands of a hoa signal representation

Encoding of higher order ambisonics (hoa) signals commonly results in high data rates. For data rate reduction, a method (100) for encoding direction information for frames of an input hoa signal comprises determining (s101) active candidate directions (i) among predefined global directions having global direction indices, dividing (s102) the input hoa signal into frequency subbands (ii), determining (s103) for each frequency subband active subband directions among the active candidate directions, assigning (s104) a relative direction index to each direction per subband, assembling (s105) direction information for the frame, the direction information comprising the active candidate directions (i), for each subband and each active candidate direction a bit indicating whether or not the active candidate direction is an active subband direction for the respective frequency subband, and for each frequency subband the relative direction indices of active subband directions in the second set of subband directions, and transmitting (s106) the assembled direction information.. ... Dolby International Ab

06/01/17 / #20170156016

Method and apparatus for encoding/decoding of directions of dominant directional signals within subbands of a hoa signal representation

Encoding of higher order ambisonics (hoa) signals commonly results in high data rates. For data rate reduction, a method (100) for encoding direction information for frames of an input hoa signal comprises determining (s101) active candidate directions (mdir(k)) among predefined global directions having global direction indices, dividing (s102) the input hoa signal into frequency subbands (f1 . ... Dolby International Ab

06/01/17 / #20170154633

Apparatus for determining for the compression of an hoa data frame representation a lowest integer number of bits required for representing non-differential gain values

When compressing an hoa data frame representation, a gain control (15, 151) is applied for each channel signal before it is perceptually encoded (16). The gain values are transferred in a differential manner as side information. ... Dolby International Ab

05/18/17 / #20170142441

Method of coding and decoding images, coding and decoding device and computer programs corresponding thereto

A method of coding at least one image comprising the steps of splitting the image into a plurality of blocks, of grouping said blocks into a predetermined number of subsets of blocks, of coding each of said subsets of blocks in parallel, the blocks of a subset considered being coded according to a predetermined sequential order of traversal. The coding step comprises, for a current block of a subset considered, the sub-step of predictive coding of said current block with respect to at least one previously coded and decoded block, and the sub-step of entropy coding of said current block on the basis of at least one probability of appearance of a symbol.. ... Dolby International Ab

05/18/17 / #20170140770

Complex exponential modulated filter bank for high frequency reconstruction

An apparatus and method are disclosed for filtering and performing high frequency reconstruction of an audio signal. The apparatus includes an analysis filter bank, a phase shifter, a high frequency reconstructor, and a synthesis filter bank. ... Dolby International Ab

05/11/17 / #20170133025

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.. ... Dolby International Ab

05/11/17 / #20170133021

Method for determining for the compression of an hoa data frame representation a lowest integer number of bits required for representing non-differential gain values

When compressing an hoa data frame representation, a gain control (15, 151) is applied for each channel signal before it is perceptually encoded (16). The gain values are transferred in a differential manner as side information. ... Dolby International Ab

05/11/17 / #20170133020

Method and apparatus for determining for the compression of an hoa data frame representation a lowest integer number of bits required for representing non-differential gain values

When compressing an hoa data frame representation, a gain control (15, 151) is applied for each channel signal before it is perceptually encoded (16). The gain values are transferred in a differential manner as side information. ... Dolby International Ab








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