SCALABLE MULTI-CHANNEL AUDIO CODING Russian patent published in 2011 - IPC G10L19/00 

FIELD: information technology.

SUBSTANCE: audio encoder adapted to encode a multi-channel audio signal comprises an encoder combination module (ECM) for generating a dominant signal part (m) and a residual signal part (s). In preferred versions the mathematical procedure includes a two-dimensional signal rotation, and the third spatial parametre (SP3) comprises a difference between the second spatial parametre (SP2) and the first spatial parametre (SP1). Preferred versions include a plurality of interconnected encoder combination module, so that, for example, six independent 5.1 format audio signals can be encoded to a single or two dominant signal parts and a number of parametre sets and residual signal parts. In an output bit stream the first output part is included in a base layer, while the second output part is included in a refinement layer. A transparent audio signal quality can be obtained by a decoder utilising both layers, while an acceptable quality can be obtained by a decoder using only the base layer data.

EFFECT: scalable spatial audio coding.

24 cl, 6 dwg