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

Dolby International Ab

Agere Systems Inc.

Koninklijke Philips Corporation N.V.

Friedrich-alexander-universitaet Erlangen-nuernberg

M2any Gmbh

Other

Technische Universitaet Ilmenau

Dolby Sweden Ab

Fraunhofer-ges

Dolby Laboratories Licensing Corporation

Koninklijke Philips Electronics N.v.

Juergen Herre

Sascha Disch

Oliver Hellmuth

Stefan Geyersberger

Guillaume Fuchs

Johannes Hilpert

Nikolaus Rettelbach

Andreas Hoelzer

Leon Terentiv

Markus Multrus

Bernhard Grill

Fabian Kuech

Harald Popp

Gerald Schuller

Stefan Wabnik

Frederik Nagel

Achim Kuntz

Harald Fuchs

Max Neuendorf

Ralf Geiger

Heiko Purnhagen

Jonas Engdegard

Christian Uhle

Michael Kratschmer

Jan Plogsties

Florin Ghido

Emanuel Habets

Christof Faller

Stefan Bayer

Oliver Wuebbolt

Eleni Fotopoulou

Oliver Thiergart

Christian Ertel

Karlheinz Brandenburg

Dirk Jeroen Breebaart

Matthias Neusinger

Ralph Sperschneider

Thomas Sporer

Ulrich Kraemer

Jérémie Lecomte

Bernd Edler

Martin Dietz

Michael Schug

Lars Villemoes

Kristofer Kjoerling

Sascha Dick

Christian Helmrich

Markus Schnell

Emmanuel Ravelli

Stefan Doehla

Goran Markovic

Juha Vilkamo

Harald Mundt

Jonas Roeden

Jouni Paulus

Falko Ridderbusch

Adrian Murtaza

Jens Hirschfeld

Thorsten Kastner

Cornelia Falch

Christian Griebel

Yoshikazu Yokotani

Eric Allamanche

Claus Spenger

Karsten Linzmeier

Giovanni Del Galdo

Leonid Terentiev

Simone Neukam

Alexander Adami

Wolfgang Jaegers

Andreas Walther

Franz Reutelhuber

Srikanth Korse

Peter Prokein

Christian Neubauer

Jan Buethe

Patrick Gampp

Christian Borss

Gerard Herman Hotho

Markus Kallinger

Andreas Silzle

Julia Havenstein

Ville Topias Pulkki

Markus Schmidt

Wolfgang Alexander Schildbach

Tom Baeckstroem

Bernhard Neugebauer

Barbara Resch

Dieter Seitzer

Alexander Groeschel

Wolfgang Hess

Jeroen Dirk Breebaart

Dirk Mahne

Bodo Teichmann

Simone Fueg

Pallavi Maben

Markus Cremer

Stefan Finauer

Erik Schuijers

Oliver Kunz

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 audio encoder for providing an output signal using an input audio signal includes a patch generator, a comparator and an output interface. The patch generator generates at least one bandwidth extension high-frequency signal, wherein a bandwidth extension high-frequency signal includes a high-frequency band. The high-frequency band of the bandwidth extension high-frequency signal is based on a low frequency band of the input audio signal. A comparator calculates a plurality of comparison parameters. A comparison parameter is calculated based on a comparison of the input audio signal and a generated bandwidth extension high-frequency signal. Each comparison parameter of the plurality of comparison parameters is calculated based on a different offset frequency between the input audio signal and a generated bandwidth extension high-frequency signal. Further, the comparator determines a comparison parameter from the plurality of comparison parameters, wherein the determined comparison parameter fulfils a predefined criterion.

Audio encoder and bandwidth extension decoder

A multi-channel audio decoder for providing at least two output audio signals on the basis of an encoded representation is configured to render a plurality of decoded audio signals, which are obtained on the basis of the encoded representation, in dependence on one or more rendering parameters, to obtain a plurality of rendered audio signals. The multi-channel audio decoder is configured to derive one or more decorrelated audio signals from the rendered audio signals, and to combine the rendered audio signals, or a scaled version thereof, with the one or more decorrelated audio signals, to obtain the output audio signals. A multi-channel audio encoder provides a decorrelation method parameter to control an audio decoder.

Multi-channel audio decoder, multi-channel audio encoder, methods, computer program and encoded audio representation using a decorrelation of rendered audio signals

An encoder for providing an audio stream on the basis of a transform-domain representation of an input audio signal includes a quantization error calculator configured to determine a multi-band quantization error over a plurality of frequency bands of the input audio signal for which separate band gain information is available. The encoder also includes an audio stream provider for providing the audio stream such that the audio stream includes information describing an audio content of the frequency bands and information describing the multi-band quantization error. A decoder for providing a decoded representation of an audio signal on the basis of an encoded audio stream representing spectral components of frequency bands of the audio signal includes a noise filler for introducing noise into spectral components of a plurality of frequency bands to which separate frequency band gain information is associated on the basis of a common multi-band noise intensity value.

Audio encoder, audio decoder, methods for encoding and decoding an audio signal, audio stream and a computer program

An encoder provides an audio stream based on a transform-domain representation of an input audio signal and includes a quantization error calculator configured to determine a multi-band quantization error over a plurality of frequency bands of the input audio signal for which separate band gain information is available. The encoder also includes an audio stream provider for providing the audio stream such that the audio stream includes information describing an audio content of the frequency bands and information describing the multi-band quantization error. A decoder provides a decoded representation of an audio signal based on an encoded audio stream representing spectral components of frequency bands of the audio signal and includes a noise filler for introducing noise into spectral components of a plurality of frequency bands to which separate frequency band gain information is associated on the basis of a common multi-band noise intensity value.

Apparatus for generating an enhanced sound field description, including: a sound field generator for generating at least one sound field description indicating a sound field with respect to at least one reference location; and a meta data generator for generating meta data relating to spatial information of the sound field, wherein the at least one sound field description and the meta data constitute the enhanced sound field description. The at least one sound field description includes in a certain case a first sound field description related to the at least one reference location and a second sound field description related to a further reference location being different from the reference location, and the meta data relating to the spatial information indicates the reference location and the further reference location or one of both reference locations and a vector extending between both reference locations.

Concept for generating an enhanced sound field description or a modified sound field description using a multi-point sound field description

An apparatus for encoding a multi-channel signal having at least two channels, has: a downmixer for calculating a downmix signal from the multi-channel signal; a parameter calculator for calculating a side gain from a first channel of the at least two channels and a second channel of the at least two channels and for calculating a residual gain from the first channel and the second channel; and an output interface for generating an output signal, the output signal having information on the downmix signal, and on the side gain and the residual gain.

Apparatus and method for encoding or decoding a multichannel signal using a side gain and a residual gain

An apparatus for processing an audio signal includes a separator for separating a first portion of a spectrum of the audio signal from a second portion of the spectrum of the audio signal, the first portion having a first signal characteristic and the second portion having a second signal characteristic. The apparatus includes a first bandwidth extender for extending a bandwidth of the first portion using first parameters associated with the first signal characteristic, for obtaining a first extended portion and includes a second bandwidth extender for extending a bandwidth of the second portion using second parameters associated with the second signal characteristic, for obtaining a second extended portion. The apparatus includes a combiner configured for using the first extended portion and the second extended portion for obtaining an extended combined audio signal.

Apparatus and methods for processing an audio signal

An apparatus for downmixing a multi-channel signal having at least two channels, has: a downmixer for calculating a downmix signal from the multi-channel signal, wherein the downmixer is configured to calculate the downmix using an absolute phase compensation, so that a channel having a lower energy among the at least two channels is only rotated or is rotated stronger than a channel having a greater energy in calculating the downmix signal; and an output interface for generating an output signal, the output signal having information on the downmix signal.

Apparatus and method for downmixing or upmixing a multichannel signal using phase compensation

An encoder for providing an audio stream on the basis of a transform- domain representation of an input audio signal includes a quantization error calculator configured to determine a multi-band quantization error over a plurality of frequency bands of the input audio signal for which separate band gain information is available. The encoder also includes an audio stream provider for providing the audio stream such that the audio stream includes information describing an audio content of the frequency bands and information describing the multi-band quantization error. A decoder for providing a decoded representation of an audio signal on the basis of an encoded audio stream representing spectral components of frequency bands of the audio signal includes a noise filler for introducing noise into spectral components of a plurality of frequency bands to which separate frequency band gain information is associated on the basis of a common multi-band noise intensity value.

An apparatus for determining a predetermined characteristic related to an artificial bandwidth limitation processing of an audio signal has a slope evaluator configured for evaluating a slope of a spectrum of the audio signal to obtain a slope evaluation result. The apparatus has a frequency evaluator configured for evaluating a cut-off frequency of the spectrum of the audio signal to obtain a frequency evaluation result, and has a processor for providing an information indicating that the audio signal has the predetermined characteristic dependent on an evaluation of the slope evaluation result and an evaluation of the frequency evaluation result.

Apparatus and method for determining a predetermined characteristic related to an artificial bandwidth limitation processing of an audio signal

An apparatus for playing back an audio object associated with a position includes a distance calculator for calculating distances of the position to speakers or for reading the distances of the position to the speakers. The distance calculator is configured to take a solution with a smallest distance. The apparatus is configured to play back the audio object using the speaker corresponding to the solution.

Apparatus and method for audio rendering employing a geometric distance definition

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Buckenhof, Germany

Juergen Herre