Audio data structure for lossy and lossless encoded extension data

US8326639B2 · kind B2 · utility

Assignee

• Thomson Licensing · FR

Inventors

• Oliver Wuebbolt · Hannover, DE
• Florian Keiler · Hannover, DE
• Peter Jax · Hannover, DE
• Sven Kordon · Wunstorf, DE
• Johannes Boehm · Göttingen, DE

Key dates

• Filing date: Jul 5, 2007
• Grant date: Dec 4, 2012
• Expiry date: Mar 22, 2030

Classification

• Technology area (CPC G): Physics
• CPC primary: G10L19/167
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

Lossless audio coding performs decorrelation and encodes the transformed signal. The encoded bit stream comprises de-correlation parameters and the lossless representation data of the transformed signal. However, in the case of lossy based lossless coding, the additional amount of information exceeds the base layer amount of data. Therefore the additional data cannot be packed completely into the base layer e.g. as ancillary data. The data streams resulting from the combination of lossy coding format with a lossless coding extension are the base layer containing the lossy coding information and the enhancement data stream for rebuilding the mathematically lossless original input signal. Every higher layer depends on the lower layers and can only be reasonably decoded in combination with these lower layers. According to the invention, a special combination of one-time header information with repeated header information in a block structure is used. Assignment information data identify the different layers.