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

Marc Gayer

Markus Multrus

Markus Lohwasser

Nikolaus Rettelbach

Manfred Lutzky

Bernhard Grill

Ralf Geiger

Markus Schnell

Sascha Disch

Bernd Edler

Gerald Schuller

Markus Schmidt

Michael Mellar

Max Neuendorf

Guillaume Fuchs

Frederik Nagel

Ulrich Kraemer

Christian Griebel

Patrick Warmbold

Vignesh Subbaraman

Oliver Weiss

Stefan Bayer

Manuel Jander

Harald Popp

Christian Helmrich

Martin Dietz

Emmanuel Ravelli

Goran Markovic

Grzegorz Pietrzyk

Maria Luis Valero

Johannes Hilpert

Harald Fuchs

Virgilio Bacigalupo

Josef Bernhard

Daniel Fischer

Andreas Niedermeier

Thomas Sporer

Stephan Wilde

Stefan Kraegeloh

Matthias Hildenbrand

Sandra Brix

Stefan Geyersberger

Konstantin Schmidt

Ralph Sperschneider

Stefan Wabnik

Wolfgang Jaegers

Joerg Pickel

Ralph Kulessa

Michael Schuldt

Andreas Walther

Patrick Aichroth

Stefan Krägeloh

Jens Hasselbach

Michael Werner

Stefan Puchta

Reinfried Bartholomaeus

Maria L Valero

Kurt Michael Krauss

Ulrich KRÄMER

Manfred Lutzki

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 sound reproduction/simulation system includes at least sound reproduction device driven by one or more audio signals and a processor for processing an input audio stream to generate the one or more audio signals. The processor performs processing based on processing parameters defined by a sound characteristic of a target system.

Sound reproduction/simulation system and method for simulating a sound reproduction

A method is described that processes an audio signal. A discontinuity between a filtered past frame and a filtered current frame of the audio signal is removed using linear predictive filtering.

Method and apparatus for processing an audio signal, audio decoder, and audio encoder to filter a discontinuity by a filter which depends on two fir filters and pitch lag

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 audio decoder for providing a decoded audio information includes a arithmetic decoder for providing a plurality of decoded spectral values on the basis of an arithmetically-encoded representation of the spectral values and a frequency-domain-to-time-domain converter for providing a time-domain audio representation using the decoded spectral values. The arithmetic decoder is configured to select a mapping rule describing a mapping of a code value onto a symbol code in dependence on a context state. The arithmetic decoder is configured to determine or modify the current context state in dependence on a plurality of previously-decoded spectral values. The arithmetic decoder is configured to detect a group of a plurality of previously-decoded spectral values, which fulfill, individually or taken together, a predetermined condition regarding their magnitudes, and to determine the current context state in dependence on a result of the detection. An audio encoder uses similar principles.

Audio encoder, audio decoder, method for encoding an audio information, method for decoding an audio information and computer program using a detection of a group of previously-decoded spectral values

A method is described that processes an audio signal. A discontinuity between a filtered past frame and a filtered current frame of the audio signal is removed using linear predictive filter. Removing the discontinuity further comprises processing a beginning portion of the filtered current frame, wherein the beginning portion of the current frame comprises a predefined number of samples being less or equal than a total number of samples in the current frame, and wherein processing the beginning portion of the current frame comprises subtracting a beginning portion of a zero-input-response (ZIR) from the beginning portion of the filtered current frame.

Method and apparatus for processing an audio signal, audio decoder, and audio encoder for removing a discontinuity between frames by subtracting a portion of a zero-input-reponse

Growing community of inventors

Erlangen, Germany

Marc Gayer