Audio encoding/decoding with syntax portions using forward aliasing cancellation

US9257130B2 · kind B2 · utility

Assignee

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

Inventors

• Jérémie Lecomte · Santa Clara, US
• Patrick Warmbold · Emskirchen, DE
• Stefan Bayer · Nuremberg, DE

Key dates

• Filing date: Jan 8, 2013
• Grant date: Feb 9, 2016
• Expiry date: Nov 3, 2033

Classification

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

Abstract

A codec supporting switching between time-domain aliasing cancellation transform coding mode and time-domain coding mode is made less liable to frame loss by adding a further syntax portion to the frames, depending on which the parser of the decoder may select between a first action of expecting the current frame to have, and thus reading forward aliasing cancellation data from the current frame and a second action of not-expecting the current frame to have, and thus not reading forward aliasing cancellation data from the current frame. In other words, while a bit of coding efficiency is lost due to the provision of the new syntax portion, it is merely the new syntax portion which provides for the ability to use the codec in case of a communication channel with frame loss. Without the new syntax portion, the decoder would not be capable of decoding any data stream portion after a loss and will crash in trying to resume parsing. Thus, in an error prone environment, the coding efficiency is prevented from vanishing by the introduction of the new syntax portion.