FIELD: electricity.
SUBSTANCE: invention relates to encoding and decoding of audio signal. Device comprises first decoding unit implemented by at least one processing device to determine a first context based on previously decoded spectral coefficients adjacent to the current tuple of 2 elements to be decoded for decoding the high-order bit (MSB) of the current tuple of 2 elements, using the first probability model obtained from the first context; and a second decoding unit implemented by the at least one processing device to determine a second context based on information indicating whether each spectral coefficient of the current tuple of 2 elements to be decoded at the current time is 0 or not 0 and to decode the LSB of the current tuple of 2 elements using the second probability model obtained from the second context.
EFFECT: technical result is increase in encoding efficiency.
1 cl, 29 dwg
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