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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.

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 new patent  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... Dolby International Ab

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... Dolby International Ab

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... Dolby International Ab

Method and 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

Mdct-based complex prediction stereo coding

(ii) computing an output channel on the basis of the first and second frequency-domain representations of the first input channel, the first frequency-domain representation of the second input channel and a complex prediction coefficient. The upmixing can be suspended responsive to control data.... Dolby International Ab

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. Based on the object spatial position and source spatial positions of the audio speakers, initial gain values... 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. This is accomplished by means of frequency... Dolby International Ab

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),... Dolby International Ab

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... Dolby International Ab

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... Dolby International Ab

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... Dolby International Ab

Sealed pipe-loaded loudspeaker for improving low frequency response in portable devices

Embodiments are directed to a sealed pipe-loaded loudspeaker for augmenting low frequency response in a portable electronic device. A loudspeaker transducer is configured to radiate sound directly out of a forward radiation area and incidentally out of a rearward radiation area, and a sealed transmission line forming a closed pipe... 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. According to the disclosure, a modulo differential... Dolby International Ab

Methods for parametric multi-channel encoding

The present document relates to audio coding systems. In particular, the present document relates to efficient methods and systems for parametric multi-channel audio coding. An audio encoding system configured to generate a bitstream indicative of a downmix signal and spatial metadata for generating a multi-channel upmix signal from the downmix... Dolby International Ab

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... Dolby International Ab

System for maintaining reversible dynamic range control information associated with parametric audio coders

In particular embodiments, the reconstruction further includes use of compensated post-processing DRC parameters quantifying a potential decoder-side dynamic range compression. Cancellation of an encoder-side range limitation and range compression are preferably performed by different decoder-side components. Cancellation and compression may be coordinated by a DRC pre-processor.... Dolby International Ab

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... Dolby International Ab

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... Dolby International Ab

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. Loudness measurements are then performed on the individual portions... Dolby International Ab

Reconstruction of audio scenes from a downmix

In a second aspect, audio objects have been encoded together with at least one bed channel positioned at a positional locator of a corresponding downmix channel. The decoding system receives the downmix signal and the positional metadata of the audio objects. A bed channel is reconstructed by suppressing the content... Dolby International Ab

Audio decoder for interleaving signals

A method for decoding an encoded audio bitstream in an audio processing system is disclosed. The method includes extracting from the encoded audio bitstream a first waveform-coded signal comprising spectral coefficients corresponding to frequencies up to a first cross-over frequency for a time frame and performing parametric decoding at a... Dolby International Ab

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. The buffer may store tables, each represented by a symbol in the first sequence, and each used... Dolby International Ab

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... Dolby International Ab

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... Dolby International Ab

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. Based on the object spatial position and source spatial positions of the audio speakers, initial gain values... Dolby International Ab

Frame element positioning in frames of a bitstream representing audio content

A better compromise between a too high bitstream and decoding overhead on the one hand and flexibility of frame element positioning on the other hand is achieved by arranging that each of the sequence of frames of the bitstream has a sequence of N frame elements and, on the other... Dolby International Ab

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. Furthermore, the method (500) comprises applying (502) a first ripple pre-emphasis gain (323) to a first input... Dolby International Ab

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... Dolby International Ab

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... Dolby International Ab

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. The high frequency reconstructor or parametric stereo processor generates modified complex-valued subband samples. A phase shifter unshifts a phase of... Dolby International Ab

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. The analysis filterbank receives real-valued time domain input audio samples and generates complex valued subband samples.... Dolby International Ab

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... Dolby International Ab

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. The method comprises determining a first rendering mode from the... Dolby International Ab

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... Dolby International Ab

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... 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. The downmix signal comprises at least one... Dolby International Ab

08/24/17 / #20170243589

Method and 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... 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). A first container (501) of the sequence of containers (501) comprises a plurality of substream entities (520) for a plurality of substreams (411, 412,... Dolby International Ab

08/24/17 / #20170243592

Method and 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. The number of subband groups NSB is coded using a fixed number of bits representing NSB−1.... 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. Furthermore, the grouping of the channels... 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). The buffer joins sets of audio data (D1; D2, . . . , DN) carried by N respective frames (F1, F2, . .... 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... 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. The analysis filterbank receives real-valued time domain input audio samples and generates complex valued subband samples.... 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... 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... 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... 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. According... 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... 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... 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... 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... 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... 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... 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... 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... 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. A method for determining a first banded tonality value... 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. A method for estimating a first sample (615) of a first subband signal in a first subband of an... 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... 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... Dolby International Ab

08/03/17 / #20170223476

Processing spatially diffuse or large audio objects

Diffuse or spatially large audio objects may be identified for special processing. A decorrelation process may be performed on audio signals corresponding to the large audio objects to produce decorrelated large audio object audio signals. These decorrelated large audio object audio signals may be associated with object locations, which may... 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... Dolby International Ab

07/27/17 / #20170213566

System and non-destructively normalizing loudness of audio signals within portable devices

Many portable playback devices cannot decode and playback encoded audio content having wide bandwidth and wide dynamic range with consistent loudness and intelligibility unless the encoded audio content has been prepared specially for these devices. This problem can be overcome by including with the encoded content some metadata that specifies... 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

07/20/17 / #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. The analysis filterbank receives real-valued time domain input audio samples and generates complex valued... 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. The analysis filterbank receives real-valued time domain input audio samples and generates complex valued... Dolby International Ab

Patent Packs
07/20/17 / #20170208410

Method and 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. The invention deals with the processing for stereo decoders for higher-order Ambisonics HOA. The desired panning... Dolby International Ab

07/06/17 / #20170194011

Apparatus and 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... 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. The analysis filterbank receives real-valued time domain input audio samples and generates complex valued... 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. Control objects representing audio objects are movable by the user to different locations in the position... 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... 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... 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... 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... Dolby International Ab

06/22/17 / #20170178634

Method for compressing a higher order ambisonics signal, decompressing (hoa) a compressed hoa signal, compressing a hoa signal, and 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... 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. This is accomplished by means of frequency... 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. This is accomplished by means of frequency... 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. This is accomplished by means of frequency... 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. This is accomplished by means of frequency... 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. This is accomplished by means of frequency... 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. This is accomplished by means of frequency... Dolby International Ab

Patent Packs
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. The method further includes decoding the encoded audio signal with... 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. The method further includes decoding the encoded audio signal with... 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. A method of encoding samples of an audio signal comprises determining a first measure indicative of... 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. The method further includes decoding the encoded audio signal with... 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. The method further includes decoding the encoded audio signal with... 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. The method further includes decoding the encoded audio signal with... 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. The method further includes decoding the encoded audio signal with... 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. The method further includes decoding the encoded audio signal with... 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 / #20170180734

Piecewise inter-layer prediction for signals with enhanced dynamic range

Pixel data of a video sequence with enhanced dynamic range (EDR) are predicted based on pixel data of a corresponding video sequence with standard dynamic range (SDR) and a piecewise inter-layer predictor. The output parameters of the piecewise predictor are computed based atleast on two sets of pre-computed values and... Dolby International Ab

06/22/17 / #20170180902

Method for compressing a higher order ambisonics (hoa) signal, decompressing a compressed hoa signal, compressing a hoa signal, and 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... 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... 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. The analysis filterbank receives real-valued time domain input audio samples and generates complex valued subband samples. The... 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... Dolby International Ab

06/08/17 / #20170164130

Method and 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... Dolby International Ab

06/08/17 / #20170164131

Method and decoding a compressed hoa representation, and 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... Dolby International Ab

06/08/17 / #20170164132

Method and decoding a compressed hoa representation, and 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... 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. However, for starting decoding of such streamed compressed HOA data frame representation absolute gain... Dolby International Ab

06/01/17 / #20170156016

Method and 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... Dolby International Ab

05/25/17 / #20170148449

Method for compressing a higher order ambisonics (hoa) signal, decompressing a compressed hoa signal, compressing a hoa signal, and 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... Dolby International Ab

05/25/17 / #20170148450

Audio decoder with core decoder and surround decoder

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... Dolby International Ab








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