OPTIMIZED SCALE FACTOR FOR EXTENDING FREQUENCY RANGE IN AUDIO SIGNAL DECODER Russian patent published in 2021 - IPC G10L21/38 

FIELD: audio data processing.

SUBSTANCE: invention relates to the field of audio data processing. The technical result described below is achieved by calculating the frequency response of R linear frequency range prediction filter, smoothing the R value to obtain the R_smoothed value, moreover, the smoothing method is selected from a group of smoothing methods, including at least two smoothing methods, depending on a set of parameters containing a set of parameters, including the value of the steepness of the spectrum, the slope, determination of the optimized scale factor, calculation of max (min (R_smoothed, Q), P)/P, wherein P is the frequency response of the linear prediction filter over the second frequency range, and the second frequency range is higher than the first frequency range, Q is the frequency response of the additional filter obtained by truncating the polynomial of the linear prediction filter.

EFFECT: improving the accuracy of the optimized scale factor determination.

8 cl, 10 dwg, 2 tbl