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

Heiko Purnhagen

Lars Villemoes

Kristofer Kjoerling

Per Ekstrand

Jonas Engdegard

Leif Jonas Samuelsson

Pontus Carlsson

Karl Jonas Roeden

Jonas Roeden

Toni Hirvonen

Leif Sehlstrom

Harald Mundt

Dirk Jeroen Breebaart

Juergen Herre

Glenn N Dickins

Jeffrey Charles Riedmiller

Vinay Melkote

Erik Gosuinus Petrus Schuijers

Jeroen Dirk Breebaart

Heidi-Maria Lehtonen

Johannes Hilpert

Andreas Hoelzer

Alexander Stahlmann

Robin Thesing

Gerard Herman Hotho

Janusz Klejsa

Jens Popp

Erik Schuijers

Markus Multrus

Max Neuendorf

Nicolas R Tsingos

Stefan Doehla

Antonio Mateos Sole

Cornelia Falch

Frans De Bont

David S McGrath

David Matthew Cooper

Kristofer Kjörling

Tobias Friedrich

Werner Oomen

Sascha Disch

Matthias Neusinger

Xuejing Sun

Mark Stuart Vinton

Jürgen Herre

Jeroen Koppens

Rhonda J Wilson

Martin Wolters

Karsten Linzmeier

Barbara Resch

Leonid Terentiev

Klaus Peichl

Karl Jonas Roden

Stefan Bruhn

Oliver Hellmuth

Leon Terentiv

Richard James Cartwright

Shen Huang

Per Hedelin

Falko Ridderbusch

Thorsten Kastner

Michael Eckert

Alexander Groeschel

Wolfgang Alexander Schildbach

Fransiscus Marinus Jozephus De Bont

Machiel Willem Van Loon

Holger Horich

Jonas Röden

Christian Helmrich

Nikolaus Rettelbach

Bernd Edler

Christof Faller

Kai Lin Li

Ralph Sperschneider

Christof Fersch

Michael John Smithers

Holger Hoerich

Albertus Cornelis Den Brinker

Dong Shi

Arijit Biswas

Mark R P Thomas

Juan Felix Torres

Freddie Sanchez

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

Hans Magnus Kristofer Kjorling

Reinhold Boehm

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

Integration of high frequency reconstruction techniques with reduced post-processing delay

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 second cross-over frequency for the time frame to generate a reconstructed signal. The second cross-over frequency is above the first cross-over frequency and the parametric decoding uses reconstruction parameters derived from the encoded audio bitstream to generate the reconstructed signal. The method also includes extracting from the encoded audio bitstream a second waveform-coded signal comprising spectral coefficients corresponding to a subset of frequencies above the first cross-over frequency for the time frame and interleaving the second waveform-coded signal with the reconstructed signal to produce an interleaved signal for the time frame.

Audio decoder for interleaving signals

Growing community of inventors

Sundbyberg, Sweden

Heiko Purnhagen