SIGNAL CODING USING CODING WITH FUNDAMENTAL TONE REGULARISATION AND WITHOUT FUNDAMENTAL TONE REGULARISATION Russian patent published in 2012 - IPC G10L19/14 

FIELD: physics, acoustics.

SUBSTANCE: invention relates to audio signal coding, particularly signal coding by coding with pitch regularisation (PR) and without PR. A first audio signal frame is coded according to a coding with PR scheme and a second frame, following the first frame in the audio signal, is coded according to a coding without PR scheme. Coding the first frame involves temporary modification, based on time shift, of a segment of the first signal based on the first frame. Temporary modification involves one of (A) temporary shift of a segment of the first frame according to the time shift and (B) changing the time scale of the segment of the first signal based on time shift. Temporary modification of the segment of the first signal involves changing the position of the pitch pulse of the segment relative another pitch pulse of the first signal. Coding the second frame involves temporary modification, based on time shift, of a segment of the second signal based on the second frame. Temporary modification involves one of (A) temporary shift of a segment of the second frame according to the time shift and (B) changing the time scale of the segment of the second signal based on time shift.

EFFECT: improved perceptible quality of the audio signal when switching between coding with PR and without PR schemes in a multimode audio coding system.

71 cl, 44 dwg