ADAPTIVE RESIDUAL AUDIO CODING Russian patent published in 2010 - IPC G10L19/00 

FIELD: information technologies.

SUBSTANCE: audio signal having at least two channels can be effectively mixed with channel number reduction into signal of lowering mixing and residual signal when lowering mixing rule being used depends on spatial parametre which is obtained from audio signal and subjected to postprocessing by limiter to apply limit to obtained spatial parametre. In the presence of lowering mixing rule which is dynamically dependent from parametres describing relationship between audio channels, it can be guaranteed that energy in the residual signal of lowering mixing is so minimal as possible for effective coding. Using postprocessing of spatial parametre by limiter before its usage in lowering mixing, it is possible to avoid instability in rising mixing or lowering mixing which otherwise can cause distortion of coded or decoded audio signal spatial perception.

EFFECT: providing high quality audio signal coding for compressed representation of audio signal, at the same time effectively avoiding artifacts introduced by coding or decoding.

45 cl, 14 dwg