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

Voiceage Corporation

Technische Universitat Ilmenau

Technische Universitaet Ilemnau

Gerald Schuller

Bernhard Grill

Ralf Geiger

Markus Multrus

Guillaume Fuchs

Bernd Edler

Stefan Wabnik

Jens Hirschfeld

Markus Schnell

Juergen Herre

Manfred Lutzky

Stefan Bayer

Harald Popp

Nikolaus Rettelbach

Stefan Geyersberger

Max Neuendorf

Marc Gayer

Markus Lohwasser

Markus Schmidt

Michael Mellar

Sascha Disch

Ulrich Kraemer

Thomas Sporer

Alexander Zink

Jérémie Lecomte

Frederik Nagel

Michael Schnabel

Juergen Koller

Johannes Hilpert

Jürgen Herre

Christian Neukam

Bruno Bessette

Karlheinz Brandenburg

Philippe Gournay

Yoshikazu Yokotani

Wolfgang Fiesel

Ulrich Krämer

Michael Werner

Jürgen Koller

Sasch Disch

Manfred Lutzki

Nikolaus Rettlebach

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.

Methods, apparatus and techniques for acquiring output signals associated with different sources (such as audio sources) are presented. A first input signal is combined with a delayed and scaled version of a second input signal, to acquire a first output signal. A second input signal is combined with a delayed and scaled version of the first input signal, to acquire a second output signal. Using a random direction optimization, scaling values (forming a candidates' vector) are determined by iteratively modifying the candidates' vector. A Kullback-Leibler divergence is measured. The first output signal and the second output signal are selected to be those measurements associated with the candidate parameters associated with Kullback-Leibler divergence which indicates lowest similarity.

Apparatus and method for acquiring a plurality of audio signals associated with different sound sources

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

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.

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Erfurt, Germany

Gerald Schuller