METHOD OF ENCODING AND DECODING, CODER AND DECODER, PROGRAMME AND RECORDING CARRIER Russian patent published in 2015 - IPC G10L19/02 H03M7/30 

FIELD: physics.

SUBSTANCE: sequence of frequency area counts isolated from acoustic signal is divided by weighed envelope and, then, to the gain. Obtained result is quantised while every count is subjected to variable-length encoding. The error between quantising and count after quantising is quantised with the help of data stored in said variable-length encoding. This quantising is executed by the rule that sets the counts in compliance with the number of memorised bits the errors of which should be quantised. At decoding, variable-length codes in sequence of codes being loaded are decoded to get the frequency area counts series. The error signal is additionally decoded by the rule depending on the variable-length code bits. Obtained series of counts is used to derive the initial series of counts in compliance with the auxiliary data.

EFFECT: higher efficiency of acoustic signal encoding at encoding at low bit rate.

38 cl, 6 dwg