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

Voiceage Corporation

Dolby International Ab

Koninklijke Philips Corporation N.v.

Ralf Geiger

Sascha Disch

Guillaume Fuchs

Max Neuendorf

Bernd Edler

Stefan Bayer

Markus Multrus

Bernhard Grill

Gerald Schuller

Markus Schnell

Konstantin Schmidt

Christian Neukam

Christian Helmrich

Nikolaus Rettelbach

Frederik Nagel

Markus Lohwasser

Jérémie Lecomte

Stefan Geyersberger

Andreas Niedermeier

Manfred Lutzky

Benjamin Schubert

Philippe Gournay

Johannes Hilpert

Harald Popp

Marc Gayer

Redwan Salami

Ulrich Kraemer

Emmanuel Ravelli

Bruno Bessette

Markus Schmidt

Balaji Nagendran Thoshkahna

Michael Mellar

Juergen Herre

Roch Lefebvre

Manuel Jander

Matthias Hildenbrand

Jimmy Lapierre

Tobias Chalupka

Yoshikazu Yokotani

Matthias Neusinger

Wolfgang Jaegers

Stephan Wilde

Tom Baeckstroem

Conrad Benndorf

Thomas Sporer

Christian Ertel

Florin Ghido

Julien Robilliard

Michael Fischer

Lars Villemoes

Goran Markovic

Ralph Sperschneider

Karlheinz Brandenburg

Franz Reutelhuber

Jan Büthe

Juergen Koller

Janine Sukowski

Martin Dietz

Jens Hirschfeld

Alexander Tschekalinskij

Tom Backstrom

Stefan Doehla

Jürgen Herre

Eleni Fotopoulou

Albertus Cornelis Den Brinker

Stefan Wabnik

Vignesh Subbaraman

Maria Luis Valero

Arne Borsum

Vesa Ruoppila

Joachim Deguara

Tom Bäckström

Michael Werner

Marco Diatschuk

Maria L Valero

Christian Spitzner

Jürgen Koller

Jurgen Herre

Jurgen Koller

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 includes: a base channel decoder for decoding an encoded base channel to acquire a decoded base channel; a decorrelation filter for filtering at least a portion of the decoded base channel to acquire a filling signal; and a multichannel processor for performing a multichannel processing using a spectral representation of the decoded base channel and a spectral representation of the filling signal, wherein the decorrelation filter is a broad band filter and the multichannel processor is configured to apply a narrow band processing to the spectral representation of the decoded base channel and the spectral representation of the filling signal.

Apparatus for encoding or decoding an encoded multichannel signal using a filling signal generated by a broad band filter

An apparatus for generating an enhanced signal from an input signal, wherein the enhanced signal has spectral values for an enhancement spectral region, the spectral values for the enhancement spectral regions not being contained in the input signal, includes a mapper for mapping a source spectral region of the input signal to a target region in the enhancement spectral region, the source spectral region including a noise-filling region; and a noise filler configured for generating first noise values for the noise-filling region in the source spectral region of the input signal and for generating second noise values for a noise region in the target region, wherein the second noise values are decorrelated from the first noise values or for generating second noise values for a noise region in the target region, wherein the second noise values are decorrelated from first noise values in the source region.

Apparatus and method for generating an enhanced signal using independent noise-filling identified by an identification vector

An apparatus for processing an audio signal includes a configurable first audio signal processor for processing the audio signal in accordance with different configuration settings to obtain a processed audio signal, wherein the apparatus is adapted so that different configuration settings result in different sampling rates of the processed audio signal. The apparatus furthermore includes n analysis filter bank having a first number of analysis filter bank channels, a synthesis filter bank having a second number of synthesis filter bank channels, a second audio processor being adapted to receive and process an audio signal having a predetermined sampling rate, and a controller for controlling the first number of analysis filter bank channels or the second number of synthesis filter bank channels in accordance with a configuration setting.

Resampling output signals of QMF based audio codecs

An apparatus for generating a decoded two-channel signal, comprising: a parametric decoder for providing parametric data for a second set of second spectral portions and a two-channel identification identifying for a second spectral portion of the second set of second spectral portions either a first two-channel representation for the second spectral portion of the second set of second spectral portions or a second two-channel representation for the second spectral portion of the second set of second spectral portions, the second two-channel representation being different from the first two-channel representation; and a frequency regenerator for regenerating the second spectral portion of the second set of second spectral portions depending on a first spectral portion of a first set of first spectral portions, the parametric data for the second spectral portion of the second set of second spectral portions and the two-channel identification for the second spectral portion of the second set of second spectral portions to acquire a regenerated second spectral portion of the second set of second spectral portions.

Audio encoder, audio decoder and related methods using two-channel processing within an intelligent gap filling framework

An embodiment of an apparatus for generating audio subband values in audio subband channels includes an analysis windower for windowing a frame of time-domain audio input samples being in a time sequence extending from an early sample to a later sample using an analysis window function including a sequence of window coefficients to obtain windowed samples. The analysis window function includes a first number of window coefficients derived from a larger window function including a sequence of a larger second number of window coefficients, wherein the window coefficients of the window function are derived by an interpolation of window coefficients of the larger window function. The apparatus further includes a calculator for calculating the audio subband values using the windowed samples.

Apparatus and method for generating audio subband values and apparatus and method for generating time-domain audio samples

There are provided methods and apparatus for performing modified cosine transformation (MDCT) with an analysis/synthesis windowing function, using an analysis windowing function having a meandering portion which passes a linear function in correspondence of at least four points.

Analysis/synthesis windowing function for modulated lapped transformation

Growing community of inventors

Erlangen, Germany

Ralf Geiger