Audio signal decoder, audio signal encoder, methods and computer program using a sampling rate dependent time-warp contour encoding

US9129597B2 · kind B2 · utility

Assignees

• Fraunhofer-Gesellschaft zur förderung der angewandten Forschung e.V. · DE
• Dolby International AB · IE

Inventors

• Stefan Bayer · Nuremberg, DE
• Tom Baeckstroem · Nuremberg, DE
• Ralf Geiger · Erlangen, DE
• Bernd Edler · Hannover, DE
• Sascha Disch · Bad Mergentheim, DE
• Lars Villemoes · Stockholm, SE

Key dates

• Filing date: Sep 6, 2012
• Grant date: Sep 8, 2015
• Expiry date: Jun 28, 2033

Classification

• Technology area (CPC G): Physics
• CPC primary: G10L25/90
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

An audio signal decoder configured to provide a decoded audio signal representation on the basis of an encoded audio signal representation including a sampling frequency information, an encoded time warp information and an encoded spectrum representation includes a time warp calculator and a warp decoder. The time warp calculator is configured to adapt a mapping rule for mapping codewords of the encoded time warp information onto decoded time warp values describing the decoded time warp information in dependence on the sampling frequency information. The warp decoder is configured to provide the decoded audio signal representation on the basis of the encoded spectrum representation and in dependence on the decoded time warp information.