ENCODER, DECODER, ENCODING METHOD AND DECODING METHOD Russian patent published in 2013 - IPC G10L19/02 

FIELD: information technology.

SUBSTANCE: in the encoder, spectrum residue form vector candidates are stored in a spectrum residue form codebook (305), spectrum residue gain candidates are stored in a spectrum residue gain codebook (307), 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 (306). A multiplier (308) multiplies the spectrum residue form vector candidate by the spectrum residue gain candidate and sends the result to a filtration unit (303). Using the internal status of the filter, the filtration unit (303) filters the fundamental tone given by the filter status setting unit (302), lag T which is output by a lag setting unit (304), 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 first and second layers, even if the unit of the second or higher layer encodes at a low bit rate.

9 cl, 21 dwg