TRANSFORM AUDIO CODEC AND METHODS FOR ENCODING AND DECODING TIME SEGMENT OF AUDIO SIGNAL Russian patent published in 2016 - IPC G10L19/02 G01L19/02 G10L19/32 

FIELD: physics, acoustics.

SUBSTANCE: invention relates to means of encoding/decoding the time segment of an audio signal. The method comprises deriving an indicator z of the position on a frequency scale of a residual vector associated with the time segment of the audio signal; deriving a measure Φ, related to the size of the structure of the residual vector; determining whether a predefined criterion involving the measure Φ, the indicator z and a predefined threshold θ, is fulfilled, which corresponds to estimating whether a change of sign of at least some of the non-zero coefficients of the residual vector would be audible after reconstruction of the audio signal time segment; encoding the respective amplitude of the coefficients of the residual vector, and encoding the signs of the coefficients of the residual vector only when it is determined that the criterion is fulfilled, and thus, that a change of sign would be audible.

EFFECT: high encoding efficiency in a transform audio codec.

26 cl, 8 dwg