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

US8457975B2 · kind B2 · utility

Assignee

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

Inventors

• Max Neuendorf · Nuremberg, DE
• Jérémie Lecomte · Santa Clara, US
• Markus Multrus · Nuremberg, DE
• Stefan Bayer · Nuremberg, DE
• Frederik Nagel · Nuremberg, DE
• Guillaume Fuchs · Erlangen, DE
• Julien Robilliard · Nuremberg, DE
• Nikolaus Rettelbach · Nuremberg, DE
• Ralf Geiger · Erlangen, DE
• Bernhard Grill · Lautenbächle, DE

Key dates

• Filing date: Jan 27, 2010
• Grant date: Jun 4, 2013
• Expiry date: Apr 5, 2032

Classification

• Technology area (CPC G): Physics
• CPC primary: G10L19/20
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

An audio decoder for providing a decoded representation of an audio content on the basis of an encoded representation of the audio content comprises a linear-prediction-domain decoder core configured to provide a time-domain representation of an audio frame on the basis of a set of linear-prediction domain parameters associated with the audio frame and a frequency-domain decoder core configured to provide a time-domain representation of an audio frame on the basis of a set of frequency-domain parameters, taking into account a transform window out of a set comprising a plurality of different transform windows. The audio decoder comprises a signal combiner configured to overlap-and-add-time-domain representations of subsequent audio frames encoded in different domains, in order to smoothen a transition between the time-domain representations of the subsequent frames. The set of transform windows comprises one or more windows specifically adapted for a transition between a frequency-domain core mode and a linear-prediction-domain core mode.