Audio encoder, audio decoder, encoded audio information, methods for encoding and decoding an audio signal and computer program

US8762159B2 · kind B2 · utility

Assignee

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

Inventors

• Ralf Geiger · Erlangen, DE
• Jérémie Lecomte · Santa Clara, US
• Markus Multrus · Nuremberg, DE
• Max Neuendorf · Nuremberg, DE
• Christian Spitzner · Schweinfurt, DE

Key dates

• Filing date: Jul 26, 2011
• Grant date: Jun 24, 2014
• Expiry date: Jul 26, 2031

Classification

• Technology area (CPC G): Physics
• CPC primary: G10L19/24
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

An audio decoder for providing a decoded audio information on the basis of an encoded audio information includes a window-based signal transformer configured to map a time-frequency representation, which is described by the encoded audio information, to a time-domain representation. The window-based signal transformer is configured to select a window, out of a plurality of windows including windows of different transition slopes and windows of different transform length, on the basis of a window information. The audio decoder includes a window selector configured to evaluate a variable-codeword-length window information in order to select a window for a processing of a given portion of the time-frequency representation associated with a given frame of the audio information.