Dolby International Ab

Dolby Laboratories Licensing Corporation

Koninklijke Philips Corporation N.v.

Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V.

Coding Technologies Ab

Friedrich-alexander-universitaet Erlangen-nuernberg

Other

Agere Systems Inc.

Dobly Laboratories Licensing Corporation

Dobly International Ab

Dolby Sweden Ab

Conding Technologies Ab

Dublin International Ab

Koninklijke Philips Electronics N.v.

Heiko Purnhagen

Lars Villemoes

Kristofer Kjoerling

Per Ekstrand

Jonas Engdegard

Leif Jonas Samuelsson

Pontus Carlsson

Karl Jonas Roeden

Jonas Roeden

Toni Hirvonen

Harald Mundt

Dirk Jeroen Breebaart

Juergen Herre

Glenn N Dickins

Jeffrey Charles Riedmiller

Erik Gosuinus Petrus Schuijers

Johannes Hilpert

Andreas Hoelzer

Nicolas R Tsingos

Antonio Mateos Sole

Markus Multrus

Max Neuendorf

Stefan Doehla

David S McGrath

Kristofer Kjörling

David Matthew Cooper

Sascha Disch

Matthias Neusinger

Xuejing Sun

Jürgen Herre

Mark Stuart Vinton

Jeroen Koppens

Rhonda J Wilson

Stefan Bruhn

Oliver Hellmuth

Leon Terentiv

Richard James Cartwright

Per Hedelin

Shen Huang

Christian Helmrich

Nikolaus Rettelbach

Bernd Edler

Christof Faller

Kai Lin Li

Ralph Sperschneider

Christof Fersch

Michael John Smithers

Holger Hoerich

Albertus Cornelis Den Brinker

Julien Robilliard

Leif Sehlstrom

Vinay Melkote

Jeroen Dirk Breebaart

Heidi-Maria Lehtonen

Robin Thesing

Alexander Stahlmann

Janusz Klejsa

Gerard Herman Hotho

Jens Popp

Erik Schuijers

Cornelia Falch

Frans De Bont

Tobias Friedrich

Werner Oomen

Martin Wolters

Karsten Linzmeier

Barbara Resch

Michael Eckert

Leonid Terentiev

Klaus Peichl

Karl Jonas Roden

Falko Ridderbusch

Thorsten Kastner

Alexander Groeschel

Wolfgang Alexander Schildbach

Fransiscus Marinus Jozephus De Bont

Machiel Willem Van Loon

Dong Shi

Arijit Biswas

Mark R P Thomas

Juan Felix Torres

Freddie Sanchez

Kai Li

Lie Lu

Tobias R Wagenblass

Claus-Christian Spenger

Nicholas Luke Appleton

Daniel Homm

Mark William Gerrard

Stanislaw Gorlow

Mark David De Burgh

Ziyu Yang

Craig Johnston

Andreas Hölzer

Kurt Krauss

Yen-Liang Shue

Erik G P Schuijers

Hans Magnus Kristofer Kjorling

A method comprising receiving a first input bit stream for a first parametrically coded input audio signal, the first input bit stream including data representing a first input core audio signal and a first set including at least one spatial parameter relating to the first parametrically coded input audio signal. A first covariance matrix of the first parametrically coded audio signal is determined based on the spatial parameter(s) of the first set. A modified set including at least one spatial parameter is determined based on the determined first covariance matrix, wherein the modified set is different from the first set. An output core audio signal is determined, which is based on, or constituted by, the first input core audio signal. An output bit stream for a parametrically coded output audio signal is generated, the output bit stream including data representing the output core audio signal and the modified set.

Processing parametrically coded audio

Described herein is a method () of rendering an audio signal () for playback in an audio environment () defined by a target loudspeaker system (), the audio signal () including audio data relating to an audio object and associated position data indicative of an object position. Method () includes the initial step () of receiving the audio signal (). At step () loudspeaker layout data for the target loudspeaker system () is received. At step () control data is received that is indicative of a position modification to be applied to the audio object in the audio environment (). At step () in response to the position data, loudspeaker layout data and control data, rendering modification data is generated. Finally, at step () the audio signal () is rendered with the rendering modification data to output the audio signal () with the audio object at a modified object position that is between loudspeakers within the audio environment ().

Spatial audio signal manipulation

There is provided methods and apparatuses for decoding and encoding of audio signals. In particular, a method for decoding includes receiving a waveform-coded signal having a spectral content corresponding to a subset of the frequency range above a cross-over frequency. The waveform-coded signal is interleaved with a parametric high frequency reconstruction of the audio signal above the cross-over frequency. In this way an improved reconstruction of the high frequency bands of the audio signal is achieved.

Audio encoder and decoder for interleaved waveform coding

A method for decoding an encoded audio bitstream is disclosed. The method includes receiving the encoded audio bitstream and decoding the audio data to generate a decoded lowband audio signal. The method further includes extracting high frequency reconstruction metadata and filtering the decoded lowband audio signal with an analysis filterbank to generate a filtered lowband audio signal. The method also includes extracting a flag indicating whether either spectral translation or harmonic transposition is to be performed on the audio data and regenerating a highband portion of the audio signal using the filtered lowband audio signal and the high frequency reconstruction metadata in accordance with the flag.

Backward-compatible integration of high frequency reconstruction techniques for audio signals

Methods and systems for advanced stereo processing of an audio signal are disclosed. The methods and systems include selecting a coding mode of either transform coding or linear predictive coding and performing advanced stereo processing when in the selected coding mode. Both encoding and decoding operations are provided.

Advanced stereo coding based on a combination of adaptively selectable left/right or mid/side stereo coding and of parametric stereo coding

A method for decoding an encoded audio bitstream is disclosed. The method includes receiving the encoded audio bitstream and decoding the audio data to generate a decoded lowband audio signal. The method further includes extracting high frequency reconstruction metadata and filtering the decoded lowband audio signal with an analysis filterbank to generate a filtered lowband audio signal. The method also includes extracting a flag indicating whether either spectral translation or harmonic transposition is to be performed on the audio data and regenerating a highband portion of the audio signal using the filtered lowband audio signal and the high frequency reconstruction metadata in accordance with the flag. The high frequency regeneration is performed as a post-processing operation with a delay of 3010 samples per audio channel.

Integration of high frequency audio reconstruction techniques

The invention provides methods and devices for stereo encoding and decoding using complex prediction in the frequency domain. In one embodiment, a decoding method, for obtaining an output stereo signal from an input stereo signal encoded by complex prediction coding and comprising first frequency-domain representations of two input channels, comprises the upmixing steps of:

MDCT-based complex prediction stereo coding

The present document describes a method () for encoding a multi-channel input signal (). The method () comprises determining () a plurality of downmix channel signals () from the multi-channel input signal () and performing () energy compaction of the plurality of downmix channel signals () to provide a plurality of compacted channel signals (). Furthermore, the method () comprises determining () joint coding metadata () based on the plurality of compacted channel signals () and based on the multi-channel input signal (), wherein the joint coding metadata () is such that it allows upmixing of the plurality of compacted channel signals () to an approximation of the multi-channel input signal (). In addition, the method () comprises encoding () the plurality of compacted channel signals () and the joint coding metadata ().

Methods and devices for encoding and/or decoding immersive audio signals

Backward-compatible integration of harmonic transposer for high frequency reconstruction of audio signals

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Sundbyberg, Sweden

Heiko Purnhagen