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

Bernhard Birzer

Emanuel Habets

Dirk Mahne

Anthony Lombard

Fabian Kuech

Fabian Küch

Edwin Mabande

Paolo Annibale

Maria Luis Valero

An apparatus for processing an audio signal includes an audio signal analyzer and a filter. The audio signal analyzer is configured to analyze an audio signal to determine a plurality of noise suppression filter values for a plurality of bands of the audio signal, wherein the analyzer is configured to determine a noise suppression filter value so that a noise suppression filter value is greater than or equal to a minimum noise suppression filter value and so that the minimum noise suppression value depends on a characteristic of the audio signal. The filter is configured for filtering the audio signal, wherein the filter is adjusted based on the noise suppression filter values.

Apparatus and method for reducing noise in an audio signal

Apparatus and method for processing an audio signal using noise suppression filter values

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

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Erlangen, Germany

Bernhard Birzer