Title :
Efficient implementation of perceptual postfilter for CELP coding of speech
Author :
Chan, Cheung-Fat
Author_Institution :
Dept. of Comput. Eng. & Inf. Technol., City Univ. of Hong Kong, China
fDate :
11/21/2002 12:00:00 AM
Abstract :
An efficient method to implement the perceptual posterfilter for the suppression of coding noise in CELP-coded speech is proposed. The method is based on approximating the response of an all-pole filter to the response of the pole-zero form postfilter via cepstrum processing. This all-pole postfilter can then be implemented more efficiently than the pole-zero postfilter with less computation and filter memory.
Keywords :
cepstral analysis; decoding; digital filters; linear predictive coding; noise; poles and zeros; speech coding; 4.8 kbit/s; 8 bit; CELP speech coding; CELP speech decoder; all-pole filter response approximation; all-pole postfilter; cepstrum processing; code-excited linear predictive speech coders; coding noise suppression; filter memory; microprocessor; perceptual postfilter; pole-zero form postfilter;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:20021061
