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

Maria Luis Valero

Christian Helmrich

Johannes Hilpert

Sascha Disch

Goran Markovic

Marc Gayer

Bernhard Grill

Ralf Geiger

Konstantin Schmidt

Manfred Lutzky

Fabian Kuech

Emanuel Habets

Wolfgang Jaegers

Fabian Küch

Dirk Mahne

Anthony Lombard

Andreas Walther

Edwin Mabande

Bernhard Birzer

Michael Werner

Paolo Annibale

Moritz Wild

Philipp Götz

Guendalina Milano

Marcel Rutha

Philipp Goetz

In multichannel audio coding, an improved coding efficiency is achieved by the following measure: the noise filling of zero-quantized scale factor bands is performed using noise filling sources other than artificially generated noise or spectral replica. In particular, the coding efficiency in multichannel audio coding may be rendered more efficient by performing the noise filling based on noise generated using spectral lines from a previous frame of, or a different channel of the current frame of, the multichannel audio signal.

Noise filling in multichannel audio coding

Noise filling of a spectrum of an audio signal is improved in quality with respect to the noise filled spectrum so that the reproduction of the noise filled audio signal is less annoying, by performing the noise filling in a manner dependent on a tonality of the audio signal.

Noise filling concept

A partitioned block frequency domain adaptive filter device includes a frequency domain adaptive filter configured for filtering a frequency domain representation of a time domain input signal depending on a set of filter coefficients consisting of a plurality of blocks of filter coefficients in order to produce a filtered signal; a plurality of parallel arranged filter update blocks; wherein each of the filter update blocks includes an adaptation module configured for executing an adaptation sequence including the steps of calculating an approximation of a constrained gradient update for the filter coefficients of the respective block of filter coefficients, and calculating a cumulative error introduced on the unconstrained gradient update; wherein each of the filter update blocks includes a correction module configured for executing a correction sequence including the steps of calculating a corrected constrained gradient update for the filter coefficients of the respective block of filter coefficients.

Partitioned block frequency domain adaptive filter device comprising adaptation modules and correction modules

Noise filling in perceptual transform audio codecs is improved by performing the noise filling with a spectrally global tilt, rather than in a spectrally flat manner.

Noise filling in perceptual transform audio coding

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Nuremberg, Germany

Maria Luis Valero