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

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Voiceage Corporation

Fraunhofer-Gesellschaft Zur Förderung Der Angewandten Forschung E.v.

Technische UniversitÄt Ilmenau

Disch, Sascha

Frederik Nagel

Sascha Disch

Max Neuendorf

Christian Helmrich

Nikolaus Rettelbach

Stefan Bayer

Guillaume Fuchs

Ralf Geiger

Christian Neukam

Markus Multrus

Konstantin Schmidt

Juergen Herre

Bernd Edler

Balaji Nagendran Thoshkahna

Ulrich Kraemer

Bernhard Grill

Stephan Wilde

Christian Griebel

Jeremie Lecomte

Lars Villemoes

Per Ekstrand

Marc Gayer

Markus Lohwasser

Dominik Zorn

Julien Robilliard

Andreas Niedermeier

Stefan Wabnik

Harald Popp

Johannes Hilpert

Jérémie Lecomte

Sascha Dick

Manuel Jander

Florian Schuh

Gerald Schuller

Redwan Salami

Christian Ertel

Philippe Gournay

Jens Hirschfeld

Markus Schnell

Stefan Geyersberger

Matthias Neusinger

Achim Kuntz

Jürgen Herre

Oliver Wuebbolt

Michael Fischer

Virgilio Bacigalupo

Richard Fueg

Yoshikazu Yokotani

Michael Schnabel

Andreas Walther

Patrick Warmbold

Vignesh Subbaraman

Arne Borsum

Oliver Wübbolt

Tilo Wik

Christian Greibel

Ulrich KRÄMER

Stefan Wilde

Niedermeier Andreas,

Julien Robillard

Jurgen Herre

Richard Füg

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

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

A device and method for manipulating an audio signal includes a windower for generating a plurality of consecutive blocks of audio samples, the plurality of consecutive blocks including at least one padded block of audio samples, the padded block having padded values and audio signal values, a first converter for converting the padded block into a spectral representation having spectral values, a phase modifier for modifying phases of the spectral values to obtain a modified spectral representation and a second converter for converting the modified spectral representation into a modified time domain audio signal.

Device and method for manipulating 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 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 decoding an encoded multichannel signal of a current frame to obtain three or more current audio output channels is provided. A multichannel processor is adapted to select two decoded channels from three or more decoded channels depending on first multichannel parameters. Moreover, the multichannel processor is adapted to generate a first group of two or more processed channels based on the selected channels. A noise filling module is adapted to identify for at least one of the selected channels, one or more frequency bands, within which all spectral lines are quantized to zero, and to generate a mixing channel using, depending on side information, a proper subset of three or more previous audio output channels that have been decoded, and to fill the spectral lines of frequency bands, within which all spectral lines are quantized to zero, with noise generated using spectral lines of the mixing channel.

Apparatus and method for stereo filling in multichannel coding

An apparatus for processing an input audio signal relies on a cascade of filterbanks, the cascade having a synthesis filterbank for synthesizing an audio intermediate signal from the input audio signal, the input audio signal being represented by a plurality of first subband signals generated by an analysis filterbank, wherein a number of filterbank channels of the synthesis filterbank is smaller than a number of channels of the analysis filterbank. The apparatus furthermore has a further analysis filterbank for generating a plurality of second subband signals from the audio intermediate signal, wherein the further analysis filterbank has a number of channels being different from the number of channels of the synthesis filterbank, so that a sampling rate of a subband signal of the plurality of second subband signals is different from a sampling rate of a first subband signal of the plurality of first subband signals.

Apparatus and method for processing an input audio signal using cascaded filterbanks

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Nuremberg, Germany

Frederik Nagel