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

Voiceage Corporation

Dolby International Ab

Koninklijke Philips Corporation N.v.

Fraunhofer-gesellschaft Zur F&#xd6;rderung Der Angewandten Forschung E.v.

Nikolaus Rettelbach

Markus Multrus

Bernhard Grill

Guillaume Fuchs

Max Neuendorf

Stefan Geyersberger

Harald Popp

Johannes Hilpert

Stefan Bayer

Frederik Nagel

Sascha Disch

Ralf Geiger

Ulrich Kraemer

Juergen Herre

Marc Gayer

Stefan Wabnik

Christian Helmrich

Philippe Gournay

Redwan Salami

Jens Hirschfeld

Stefan Doehla

Jeremie Lecomte

Bruno Bessette

Roch Lefebvre

Matthias Neusinger

Gerald Schuller

Ingo Hofmann

Jérémie Lecomte

Bernd Edler

Harald Fuchs

Daniel Fischer

Julien Robilliard

Christian Griebel

Bernd Czelhan

Markus Lohwasser

Sascha Dick

Manuel Jander

Lars Villemoes

Michael Schug

Heiko Purnhagen

Markus Schnell

Konstantin Schmidt

Goran Markovic

Benjamin Schubert

Jürgen Herre

Virgilio Bacigalupo

Jimmy Lapierre

Patrick Warmbold

Vignesh Subbaraman

Oliver Weiss

Nikolaus Faerber

Yoshikazu Yokotani

Florian Schuh

Richard Fueg

Matthias Hildenbrand

Tobias Schwegler

Matthias Felix

Lukas Schuster

Bernd Herrmann

Bodo Teichmann

Julien Robillard

Stefan Dohla

Pontus Carlsson

Albertus Cornelis Den Brinker

Tom Baeckstroem

Stephan Wilde

Karsten Linzmeier

Albert Heuberger

Eric Allamanche

Arthur Tritthart

Daniel Richter

Bernard Grill

Stefam Geyersberger

Raif Geiger

Richard Füg

Nikolaus Farber

Wahaj Aslam

Christina Mittag

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

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 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 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.

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.

Growing community of inventors

Nuremberg, Germany

Nikolaus Rettelbach