AUDIO ENCODER, AUDIO DECODER, METHOD OF ENCODING AUDIO INFORMATION, METHOD OF DECODING AUDIO INFORMATION AND COMPUTER PROGRAMME USING HASH TABLE DESCRIBING SIGNIFICANT STATE VALUES AND INTERVAL BOUNDARIES Russian patent published in 2016 - IPC G10L19/02 

FIELD: physics, acoustics.

SUBSTANCE: invention relates to means of encoding audio information. An audio decoder for providing decoded audio information based on encoded audio information includes an arithmetic decoder for providing a plurality of decoded spectral values based on an arithmetically encoded representation of the spectral values and a frequency domain-to-time domain converter for providing a time-domain audio representation using the decoded spectral values, in order to obtain the decoded audio information. The arithmetic decoder is configured to select a mapping rule describing mapping of a code value onto a symbol code depending on a context state described by a numeric current context value. The arithmetic decoder is configured to determine the numeric current context value depending on a plurality of previously decoded spectral values. A similar concept is employed in the audio encoder.

EFFECT: high encoding efficiency.

18 cl, 67 dwg