AUDIO CODER, AUDIO DECODER, AUDIO INFORMATION CODING METHOD, AUDIO INFORMATION DECODING METHOD, AND COMPUTER PROGRAM USING MODIFICATION OF NUMERICAL REPRESENTATION OF PREVIOUS CONTEXT NUMERICAL VALUE Russian patent published in 2018 - IPC G10L19/02 G10L19/00 

FIELD: physics.

SUBSTANCE: audio decoder includes: an arithmetic decoder for providing a plurality of decoded spectral values based on an arithmetic coded representation of the spectral values contained in the coded audio information and a frequency domain converter to the time domain for providing a time domain audio representation using the decoded spectral values in order to obtain decoded audio information; wherein the arithmetic decoder is configured to select a mapping rule describing the display of the code value of the arithmetic coded representation of the spectral values to the symbol code; to determine the numerical value of the current context; and to modify the numerical representation of the previous context numerical value, depending on the value of the context subband, in order to obtain a numerical representation of the current context numerical value.

EFFECT: providing an improved compromise between the bit rate efficiency and the resource use efficiency.

20 cl, 67 dwg