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

Voiceage Corporation

Licht-technik Vertriebs Gmbh

Koninklijke Philips Corporation N.v.

Dolby International Ab

Friedrich-alexander-universitaet Erlangen-nuernberg

Licht-technik Vertriebs Gmbh Hagenbach & Grill

Bernhard Grill

Markus Multrus

Nikolaus Rettelbach

Guillaume Fuchs

Ralf Geiger

Gerald Schuller

Stefan Geyersberger

Max Neuendorf

Markus Schnell

Harald Popp

Stefan Wabnik

Sascha Disch

Johannes Hilpert

Juergen Herre

Stefan Bayer

Ulrich Kraemer

Manfred Lutzky

Marc Gayer

Markus Lohwasser

Philippe Gournay

Jens Hirschfeld

Emmanuel Ravelli

Bruno Bessette

Frederik Nagel

Bernd Edler

Redwan Salami

Roch Lefebvre

Markus Schmidt

Virgilio Bacigalupo

Michael Mellar

Ernst Eberlein

Achim Kuntz

Harald Fuchs

Jimmy Lapierre

Jérémie Lecomte

Stefan Doehla

Benjamin Schubert

Oliver Hellmuth

Martin Dietz

Matthias Neusinger

Karlheinz Brandenburg

Falko Ridderbusch

Juliane Borsum

Manuel Jander

Leon Terentiv

Jouni Paulus

Adrian Murtaza

Giovanni Del Galdo

Christian Borss

Joerg Pickel

Bodo Teichmann

Christian Ertel

Marco Breiling

Grzegorz Pietrzyk

Florian Schuh

Michael Fischer

Tobias Bliem

Bert Greevenbosch

Reinhard Zitzmann

Christian Helmrich

Florin Ghido

Julien Robilliard

Arne Borsum

Ralph Sperschneider

Jan Plogsties

Michael Schug

Jan Büthe

Lars Villemoes

Goran Markovic

Konstantin Schmidt

Jürgen Herre

Fabian Kuech

Christian Uhle

Albertus Cornelis Den Brinker

Wolfgang Jaegers

Fabian Küch

Stefan Kraegeloh

Stephan Schreiner

Sebastian Scharrer

Michael Kratz

Simone Neukam

Dieter Seitzer

Alexander Zink

J&uuml;rgen Herre

Stefan Döhla

Heinz Gerhauser

Heinz Gerh&auml;user

Thomas Sporer

Stephan Wilde

Tom Baeckstroem

Karsten Linzmeier

Andreas Walther

Yoshikazu Yokotani

Markus Kallinger

Eric Allamanche

Andreas Silzle

Maria Luis Valero

Vesa Ruoppila

Stefan Krägeloh

A method is described which decodes a downmix matrix for mapping a plurality of input channels of audio content to a plurality of output channels, the input and output channels being associated with respective speakers at predetermined positions relative to a listener position, wherein the downmix matrix is encoded by exploiting the symmetry of speaker pairs of the plurality of input channels and the symmetry of speaker pairs of the plurality of output channels. Encoded information representing the encoded downmix matrix is received and decoded for obtaining the decoded downmix matrix.

Method for decoding and encoding a downmix matrix, method for presenting audio content, encoder and decoder for a downmix matrix, audio encoder and audio decoder

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 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.

Embodiments of the present invention provide an encoder including a quantization stage, an entropy encoder, a residual quantization stage and a coded signal former. The quantization stage is configured to quantize an input signal using a dead zone in order to obtain a plurality of quantized values. The entropy encoder is configured to encode the plurality of quantized values using an entropy encoding scheme in order to obtain a plurality of entropy encoded values. The residual quantization stage is configured to quantize a residual signal caused by the quantization stage, wherein the residual quantization stage is configured to determine at least one quantized residual value in dependence on the dead zone of the quantization stage. The coded signal former is configured to form a coded signal from the plurality of entropy encoded values and the at least one quantized residual value.

Encoder, decoder, system and methods for encoding and decoding

An audio encoder for encoding segments of coefficients, the segments of coefficients representing different time or frequency resolutions of a sampled audio signal, the audio encoder including a processor for deriving a coding context for a currently encoded coefficient of a current segment based on a previously encoded coefficient of a previous segment, the previously encoded coefficient representing a different time or frequency resolution than the currently encoded coefficient. The audio encoder further includes an entropy encoder for encoding entropy the current coefficient based on the coding context to obtain an encoded audio stream.

Audio entropy encoder/decoder with different spectral resolutions and transform lengths and upsampling and/or downsampling

An audio encoder for encoding segments of coefficients, the segments of coefficients representing different time or frequency resolutions of a sampled audio signal, the audio encoder including a processor for deriving a coding context for a currently encoded coefficient of a current segment based on a previously encoded coefficient of a previous segment, the previously encoded coefficient representing a different time or frequency resolution than the currently encoded coefficient. The audio encoder further includes an entropy encoder for entropy encoding the current coefficient based on the coding context to obtain an encoded audio stream.

An audio encoder for encoding audio input data has: a preprocessor for preprocessing the audio input data to obtain audio data to be coded; a coder processor for coding the audio data to be coded; and a controller for controlling the coder processor so that, depending on a first signal characteristic of a first frame of the audio data to be coded, a number of audio data items of the audio data to be coded by the coder processor for the first frame is reduced compared to a second signal characteristic of a second frame, and a first number of information units used for coding the reduced number of audio data items for the first frame is stronger enhanced compared to a second number of information units for the second frame.

Audio encoder with a signal-dependent number and precision control, audio decoder, and related methods and computer programs

An apparatus for generating a representation of a bandwidth-extended signal on the basis of an input signal representation includes a phase vocoder configured to obtain values of a spectral domain representation of a first patch of the bandwidth-extended signal on the basis of the input signal representation. The apparatus also includes a value copier configured to copy a set of values of the spectral domain representation of the first patch, which values are provided by the phase vocoder, to obtain a set of values of a spectral domain representation of a second patch, wherein the second patch is associated with higher frequencies than the first patch. The apparatus is configured to obtain the representation of the bandwidth-extended signal using the values of the spectral domain representation of the first patch and the values of the spectral domain representation of the second patch.

Apparatus, method and computer program for generating a representation of a bandwidth-extended signal on the basis of an input signal representation using a combination of a harmonic bandwidth-extension and a non-harmonic bandwidth-extension

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Lauf, Germany

Bernhard Grill