AUDIO ENCODER, AUDIO DECODER, METHOD OF ENCODING AUDIO INFORMATION, METHOD OF DECODING AUDIO INFORMATION AND COMPUTER PROGRAM USING ITERATIVE REDUCTION OF SIZE OF INTERVAL Russian patent published in 2016 - IPC G10L19/00 

FIELD: data processing.

SUBSTANCE: group of inventions relates to audio information encoding/decoding audio techniques. Disclosed is an audio decoder for providing decoded audio information based on encoded audio information. Audio decoder comprises an arithmetic decoder and frequency-domain to time domain converter. Arithmetic decoder is designed to provide a plurality of decoded spectral values based on an arithmetically encoded representation of spectral values. Arithmetic decoder is configured to select a mapping rule describing mapping of a code value onto a symbol code depending on numerical value of current context, which describes current state of context. Arithmetic decoder is also configured to determine numeric value of current context depending on a plurality of previously decoded spectral values.

EFFECT: high efficiency of encoding/decoding audio information.

15 cl, 48 dwg