MODIFICATION OF THE SPECTRAL CHARACTERISTICS OF A LINEAR PREDICTION FILTER OF A AUDIONUMERIC SIGNAL REPRESENTED BY ITS COEFFICIENTS LSF OR ISF.

摘要

The invention relates to digital signal processing, comprising the construction of a signal quality improvement filter, the method further comprising obtaining frequency parameters of the LSF type for "Spectral Line Frequencies" and / or ISF type for "Spectral Immunence Frequencies", derived from a linear prediction analysis of said signal. The improvement filter in the sense of the invention is defined by a combination of polynomials whose coefficients are functions at least of the frequency parameters LSF and / or ISF, and: damping factors (gamma) associated with respective roots of these polynomials (200), ISF - the improvement filter (A (Z)) is calculated at least according to said frequency parameters LSF and / or ISF and said damping factors (210).