Apparatus and method for processing an audio signal for speech enhancement using a feature extraction

US9064498B2 · kind B2 · utility

Assignee

• Fraunhofer-Gesellschaft zur förderung der angewandten Forschung e.V. · DE

Inventors

• Christian Uhle · Nuremberg, DE
• Oliver Hellmuth · Erlangen, DE
• Bernhard Grill · Lautenbächle, DE
• Falko Ridderbusch · Erlangen, DE

Key dates

• Filing date: Feb 2, 2011
• Grant date: Jun 23, 2015
• Expiry date: Dec 12, 2033

Classification

• Technology area (CPC G): Physics
• CPC primary: G10L25/30
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

An apparatus for processing an audio signal to obtain control information for a speech enhancement filter has a feature extractor for extracting at least one feature per frequency band of a plurality of frequency bands of a short-time spectral representation of a plurality of short-time spectral representations, where the at least one feature represents a spectral shape of the short-time spectral representation in the frequency band. The apparatus additionally has a feature combiner for combining the at least one feature for each frequency band using combination parameters to obtain the control information for the speech enhancement filter for a time portion of the audio signal. The feature combiner can use a neural network regression method, which is based on combination parameters determined in a training phase for the neural network.