CODER, DECODER, CODING METHOD AND DECODING METHOD Russian patent published in 2010 - IPC G10L19/02 

FIELD: information technology.

SUBSTANCE: in a coder, candidates of the spectrum residue form vector are stored in the codebook of the spectrum residue form, candidates of spectrum residue gain are stored in the codebook of the spectrum residue gain, and the spectrum residue form vector and the spectrum residue gain are successively output from the candidates in accordance with an instruction from a search unit. A multiplier multiplies the candidate of the spectrum residue form vector by the candidate of the spectrum residue gain and sends the result to a filtration unit (303). Using the internal status of the filter, the filtration unit filters the fundamental tone, given by the filter condition setting unit, lag T which is output by the lag setting unit, and the spectrum residue form vector and the controlled gain.

EFFECT: obtaining a high quality decoded signal with scalable coding of the initial signal in the first and second layers, even if the unit of the second or higher layer codes at a low bit speed.

10 cl, 21 dwg