Method of synthesising sub-band filters with quantised coefficients and filter structures obtained by this method

摘要

The method consists in determining (28), by iteration, the quantised coefficients k of the filter by an approximation of the ideal response of the filter sought by a filter with transfer function H0, in calculating (19) the frequency response of the filter H0 determined by the coefficients of each iteration, in comparing the frequency response obtained at each iteration to that of the ideal filter sought, and in keeping the coefficients of the iteration for which the error U(k) between the frequency response obtained and that of the ideal filter is a minimum. Application: compatible coding of television images. IMAGE