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

Voiceage Corporation

Dolby International Ab

Koninklijke Philips Corporation N.v.

Stefan Bayer

Guillaume Fuchs

Markus Multrus

Ralf Geiger

Sascha Disch

Max Neuendorf

Frederik Nagel

Bernd Edler

Nikolaus Rettelbach

Jérémie Lecomte

Ulrich Kraemer

Bernhard Grill

Johannes Hilpert

Oliver Thiergart

Fabian Küch

Wolfgang Jaegers

Philippe Gournay

Gerald Schuller

Eleni Fotopoulou

Redwan Salami

Stefan Döhla

Christian Helmrich

Jürgen Herre

Harald Popp

Bruno Bessette

Konstantin Schmidt

Christian Neukam

Roch Lefebvre

Balaji Nagendran Thoshkahna

Stefan Geyersberger

Florin Ghido

Jimmy Lapierre

Emmanuel Ravelli

Alexandre Bouthéon

Goran Markovic

Julien Robilliard

Markus Schnell

Martin Dietz

Stefan Doehla

Fabian Kuech

Marc Gayer

Markus Lohwasser

Oliver Wübbolt

Juergen Herre

Srikanth Korse

Jens Hirschfeld

Andrea Eichenseer

Alexandre Boutheon

Stefan Wabnik

Pallavi Maben

Lars Villemoes

Oliver Wuebbolt

Christian Borss

Tom Baeckstroem

Jan Buethe

Sascha Dick

Franz Reutelhuber

Jan Büthe

Yoshikazu Yokotani

Manuel Jander

Albertus Cornelis Den Brinker

Patrick Warmbold

Julien Robillard

Bernard Grill

Stefam Geyersberger

Raif Geiger

Christian BORß

Oliver WÜBBOLT

Wolfgang JÄGERS

Tom BÄCKSTRÖM

Ulrich KRÄMER

Jérèmie Lecomte

Sasch Disch

Albertus C Den Brinker

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 generating a bandwidth extended signal from an input signal includes a patch generator and a combiner. The input signal is represented for first and second bands by first and second resolution data, respectively, the second resolution being lower than the first. The patch generator generates first and second patches from the first band of the input signal according to first and second patching algorithms, respectively. A spectral density of the second patch generated using the second patching algorithm is higher than a spectral density of a first patch generated using the first patching algorithm. The combiner combines both patches and the first band of the input signal to obtain the bandwidth extended signal. The apparatus scales the input signal according to the first and second patching algorithms or scales the first and second patches, so that the bandwidth extended signal fulfills a spectral envelope criterion.

Apparatus and method for generating a bandwidth extended signal

Apparatus for processing an audio scene representing a sound field, the audio scene having information on a transport signal and a first set of parameters. The apparatus has a parameter processor for processing the first set of parameters to obtain a second set of parameters, wherein the parameter processor is configured to calculate at least one raw parameter for each output time frame using at least one parameter of the first set of parameters for the input time frame, to calculate a smoothing information such as a factor for each raw parameter in accordance with a smoothing rule, and to apply a corresponding smoothing information to the corresponding raw parameter to derive the parameter of the second set of parameters for the output time frame. The apparatus further has an output interface for generating a processed audio scene using the second set of parameters and the information on the transport signal.

Apparatus, method, or computer program for processing an encoded audio scene using a parameter smoothing

Apparatus for processing an audio scene representing a sound field, the audio scene comprising information on a transport signal and a set of parameters. The apparatus comprising an output interface for generating a processed audio scene using the set of parameters and the information on the transport signal, wherein the output interface is configured to generate a raw representation of two or more channels using the set of parameters and the transport signal and a multichannel enhancer for generating an enhancement representation of the two or more channels using the transport signal, and a signal combiner for combining the raw representation of the two or more channels and the enhancement representation of the two or more channels to obtain the processed audio scene.

Apparatus, method, or computer program for processing an encoded audio scene using a bandwidth extension

An apparatus generating a sound field description includes an input signal analyzer acquiring diffuseness data from the input signal; a sound component generator for generating, from the input signal, one or more sound field components of a first group of sound field components comprising for each sound field component a direct component and a diffuse component, and for generating, from the input signal, a second group of sound field components comprising only a direct component. The sound component generator is configured to perform an energy compensation when generating the first group of sound field components, the energy compensation depending on the diffuseness data and at least one of a number of sound field components in the second group, a number of diffuse components in the first group, a maximum order of sound field components of the first group and a maximum order of sound field components of the second group.

Apparatus, method and computer program for encoding, decoding, scene processing and other procedures related to DirAC based spatial audio coding using diffuse compensation

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 a sound field description using an input signal having a mono-signal or a multi-channel signal includes: an input signal analyzer for analyzing the input signal to derive direction data and diffuseness data; a low-order components generator for generating a low-order sound field description from the input signal up to a predetermined order and mode; a mid-order components generator for generating a mid-order sound field description above the predetermined order or at the predetermined order and above the predetermined mode and below or at a first truncation order using a synthesis of at least one direct portion and of at least one diffuse portion using the direction data and the diffuseness data; and a high-order components generator for generating a high-order sound field description having a component above the first truncation order using a synthesis of at least one direct portion.

Apparatus, method and computer program for encoding, decoding, scene processing and other procedures related to DirAC based spatial audio coding using low-order, mid-order and high-order components generators

A multisignal encoder for encoding at least three audio signals, including: a signal preprocessor for individually preprocessing each audio signal to obtain at least three preprocessed audio signals, wherein the preprocessing is performed so that a preprocessed audio signal is whitened with respect to the signal before preprocessing; an adaptive joint signal processor for performing a processing of the at least three preprocessed audio signals to obtain at least three jointly processed signals or at least two jointly processed signals and an unprocessed signal; a signal encoder for encoding each signal to obtain one or more encoded signals; and an output interface for transmitting or storing an encoded multisignal audio signal including the one or more encoded signals, side information relating to the preprocessing and side information relating to the processing.

Multisignal audio coding using signal whitening as processing

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Nuremberg, Germany

Stefan Bayer