Fraunhofer-gesellschaft Zur Foerderung Der Angewandten Forschung E.v.

Dolby International Ab

Koninklijke Philips Corporation N.v.

Agere Systems Inc.

Voiceage Corporation

Coding Technologies Ab

Dolby Sweden Ab

Dolby Sweden Ag

Dolby Laboratories Licensing Corporation

Friedrich-alexander-universitat Erlangen-nürnberg

Koninklijke Philips Electronics N.v.

Johannes Hilpert

Andreas Hoelzer

Juergen Herre

Achim Kuntz

Christian Ertel

Julien Robilliard

Nikolaus Rettelbach

Christian Helmrich

Stefan Geyersberger

Bernhard Grill

Matthias Neusinger

Sascha Dick

Markus Multrus

Guillaume Fuchs

Stefan Bayer

Sascha Disch

Jérémie Lecomte

Harald Popp

Ralf Geiger

Max Neuendorf

Jan Plogsties

Ulrich Kraemer

Redwan Salami

Bruno Bessette

Bernd Edler

Oliver Hellmuth

Heiko Purnhagen

Frederik Nagel

Jonas Engdegard

Jürgen Herre

Ralph Sperschneider

Michael Kratschmer

Fabian Kuech

Lars Villemoes

Manfred Lutzky

Marc Gayer

Christof Faller

Konstantin Schmidt

Leon Terentiv

Harald Mundt

Karlheinz Brandenburg

Kristofer Kjoerling

Dirk Jeroen Breebaart

Gerald Schuller

Pontus Carlsson

Kristofer Kjörling

Michael Schug

Markus Lohwasser

Jeroen Koppens

Stefan Wabnik

Wolfgang Jaegers

Fabian Küch

Christian Borss

Philippe Gournay

Roch Lefebvre

Jimmy Lapierre

Florian Schuh

Claus Spenger

Karsten Linzmeier

Cornelia Falch

Michael Fischer

Maria Luis Valero

Simone Fueg

Richard Fueg

Leonid Terentiev

Tobias Schwegler

Andreas Silzle

Adrian Murtaza

Thorsten Kastner

Alexander Adami

Andreas Hölzer

Hanne Stenzel

Simone Neukam

Jeroen Dirk Breebaart

Heinz Gerh&auml;user

J&uuml;rgen Herre

Rainer Buchta

Julien Robillard

Falko Ridderbusch

Stephan Wilde

Bernhard Neugebauer

Jens Hirschfeld

Albert Heuberger

Barbara Resch

Yoshikazu Yokotani

Erik Schuijers

Werner Oomen

Michael Werner

Jonas Röden

Bernard Grill

Stefam Geyersberger

Raif Geiger

Maria L Valero

Claus-Christian Spenger

Reinfried Bartholomaeus

Maria Luis-Valero

Steven Van De Par

Jurgen Herre

According to the present invention, multiple parametrically encoded audio signals can be efficiently combined using an audio signal generator, which generates an audio output signal by combining the down-mix channels and the associated parameters of the audio signals directly within the parameter domain, i.e. without reconstructing or decoding the individual input audio signals prior to the generation of the audio output signal. This is achieved by direct mixing of the associated down-mix channels of the individual input signals. It is one key feature of the present invention that the combination of the down-mix channels is achieved by simple, computationally inexpensive arithmetic operations.

Concept for combining multiple parametrically coded audio sources

An apparatus for generating a synthesis audio signal using a patching control signal has a first converter, a spectral domain patch generator, a high frequency reconstruction manipulator and a combiner. The first converter is configured for converting a time portion of an audio signal into a spectral representation. The spectral domain patch generator is configured for performing a plurality of different spectral domain patching algorithms, wherein each patching algorithm generates a modified spectral representation having spectral components in an upper frequency band derived from corresponding spectral components in a core frequency band of the audio signal. The spectral domain patch generator is furthermore configured to select a first spectral domain patching algorithm from the plurality of patching algorithms for a first time portion and a second spectral domain patching algorithm from the plurality of patching algorithm for a second different time portion in accordance with the patching control signal to obtain the modified spectral representation.

Apparatus and method for generating a synthesis audio signal and for encoding an audio signal

An apparatus for generating a synthesis audio signal using a patching control signal has a first converter, a spectral domain patch generator, a high frequency reconstruction manipulator and a combiner. The first converter is configured for convert- ing a time portion of an audio signal into a spectral represen- tation. The spectral domain patch generator is configured for performing a plurality of different spectral domain patching algorithms, wherein each patching algorithm generates a modified spectral representation having spectral components in an upper frequency band derived from corresponding spec- tral components in a core frequency band of the audio signal. The spectral domain patch generator is furthermore config- ured to select a first spectral domain patching algorithm from the plurality of patching algorithms for a first time portion and a second spectral domain patching algorithm from the plural- ity of patching algorithm for a second different time portion in accordance with the patching control signal to obtain the modified spectral representation.

An apparatus for encoding a multi-channel signal having at least three channels includes an iteration processor, a channel encoder and an output interface. The iteration processor is configured to calculate inter-channel correlation values between each pair of the at least three channels, for selecting a pair including a highest value or including a value above a threshold, and for processing the selected pair using a multi-channel processing operation to derive first multi-channel parameters for the selected pair and to derive first processed channels. The iteration processor is configured to perform the calculating, the selecting and the processing using at least one of the processed channels to derive second multi-channel parameters and second processed channels. The channel encoder is configured to encode channels resulting from an iteration processing to obtain encoded channels. The output interface is configured to generate an encoded multi-channel signal including the encoded channels and the first and second multi-channel parameters.

Apparatus and method for encoding or decoding a multi-channel signal

An audio encoder has a first information sink oriented encoding branch such as a spectral domain encoding branch, a second information source or SNR oriented encoding branch such as an LPC-domain encoding branch, and a switch for switching between the first and second encoding branches, the second encoding branch having a converter into a specific domain different from the spectral domain such as an LPC analysis stage generating an excitation signal, and the second encoding branch having a specific domain coding branch such as LPC domain processing branch, and a specific spectral domain coding branch such as LPC spectral domain processing branch, and an additional switch for switching between the specific domain coding branch and the specific spectral domain coding branch. An audio decoder has a first domain decoder, a second domain decoder, and a third domain decoder as well as two cascaded switches for switching between the decoders.

Low bitrate audio encoding/decoding scheme having cascaded switches

An apparatus for generating loudspeaker signals includes an object metadata processor configured to receive metadata, to calculate a second position of the audio object depending on the first position of the audio object and on a size of a screen if the audio object is indicated in the metadata as being screen-related, to feed the first position of the audio object as the position information into the object renderer if the audio object is indicated in the metadata as being not screen-related, and to feed the second position of the audio object as the position information into the object renderer if the audio object is indicated in the metadata as being screen-related. The apparatus further includes an object renderer configured to receive an audio object and to generate the loudspeaker signals depending on the audio object and on position information.

Apparatus and method for screen related audio object remapping

An audio decoder for providing at least four audio channel signals on the basis of an encoded representation is configured to provide a first residual signal and a second residual signal on the basis of a jointly encoded representation of the first residual signal and of the second residual signal using a multi-channel decoding. The audio decoder is configured to provide a first audio channel signal and a second audio channel signal on the basis of a first downmix signal and the first residual signal using a residual-signal-assisted multi-channel decoding. The audio decoder is configured to provide a third audio channel signal and a fourth audio channel signal on the basis of a second downmix signal and the second residual signal using a residual-signal-assisted multi-channel decoding. An audio encoder is based on corresponding considerations.

Audio encoder, audio decoder, methods and computer program using jointly encoded residual signals

In multichannel audio coding, an improved coding efficiency is achieved by the following measure: the noise filling of zero-quantized scale factor bands is performed using noise filling sources other than artificially generated noise or spectral replica. In particular, the coding efficiency in multichannel audio coding may be rendered more efficient by performing the noise filling based on noise generated using spectral lines from a previous frame of, or a different channel of the current frame of, the multichannel audio signal.

Noise filling in multichannel audio coding

An apparatus for upmixing a downmix audio signal describing one or more downmix audio channels into an upmixed audio signal describing a plurality of upmixed audio channels includes an upmixer and a parameter determinator. The upmixer is configured to apply temporally variable upmix parameters to upmix the downmix audio signal in order to obtain the upmixed audio signal, wherein the temporally variable upmix parameters include temporally variable smoothened phase values. The parameter determinator is configured to obtain one or more temporally smoothened upmix parameters for usage by the upmixer on the basis of a quantized upmix parameter input information. The parameter determinator is configured to combine a scaled version of a previous smoothened phase value with a scaled version of an input phase information using a phase change limitation algorithm, to determine a current smoothened phase value on the basis of the previous smoothened phase value and the phase input information.

Apparatus, method and computer program for upmixing a downmix audio signal using a phase value smoothing

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Nuremberg, Germany

Johannes Hilpert