AUDIO ENCODER, AUDIO DECODER, METHOD OF CODING AND DECODING AUDIO INFORMATION AND COMPUTER PROGRAM, DETERMINING VALUE OF CONTEXT SUB-ADAPTION BASED ON NORM OF THE DECODED SPECTRAL VALUES Russian patent published in 2017 - IPC G10L19/00 

FIELD: information technology.

SUBSTANCE: encoder, an audio decoder, method of encoding and decoding audio information, and a computer program are proposed to obtain a frequency value based on the previously normal decoded spectral values. The audio decoder for providing decoded audio information based on the encoded audio information includes an arithmetic decoder for providing a plurality of decoded spectral values based on the arithmetic encoded spectral value representation, and a time-frequency converter for providing audio representation of a time domain using the decoded spectral values to obtain decoded audio information, the arithmetic decoder selects a mapping rule that describes the mapping of the code values for the symbol code, depending on the context state, which is described by the numerical value of the current context, determines the numerical value of the current context, depending on the set of the previously decoded spectral values.

EFFECT: reducing the encoding errors of the input audio information spectral values.

19 cl, 24 dwg