REDUCTION OF DIGITAL FILTER DELAY

摘要

An apparatus for reducing a digital filter delay includes means (10) for determining the magnitude response of a desired filter. Means (12, 14, 16) form the real cepstrum of this magnitude response. Means (18) transform the real cepstrum into a complex cepstrum of a corresponding minimum-phase filter having the same magnitude response as the desired filter. A filter (20) applies a smoothly decaying shaping window to the complex cepstrum. Means (22, 24) transform the shaped complex cepstrum into an estimated minimum-phase filter.