AUDIO CODER AND DECODER Russian patent published in 2012 - IPC G10L19/00 

FIELD: information technologies.

SUBSTANCE: audio coding system comprises a linear prediction (LP) unit (201) for audio signal filtration on the basis of an LP filter, besides, the LP unit operates with duration of the first audio signal frame; a unit (202) of adaptive duration transformation to transform an audio signal frame into a transformation area, besides, transformation is modified discrete cosine transformation (MDCT), operating with an alternate duration of the second frame; a quantisation unit (203) to quantise a signal in the MDCT-area; a unit to establish an amplification curve to develop amplification curves in the MDCT-area, on the basis of LP filter response values; and a transformation unit to transform amplification curves in the MDCT-area into appropriate signal frames in the MDCT-area.

EFFECT: higher quality of coded and decoded audio signals at lower data transfer speeds.

14 cl, 45 dwg