Title :
Adaptive postfilter in 16 kbps LD-CELP speech coder
Author :
Bingxi, Wang ; Yinghua, He
Author_Institution :
Zengzhou, Henan, China
Abstract :
In September 1992, the recommendation G.728, which a 16 kbps LD-CELP speech coder submitted by AT&T was standardized by CCITT. In the process of ratification test, the coder´s performance was equivalent to or better than that of 32 kbps ADPCM for all conditions tested. This paper, which is based on a G.728 encoding-decoding system simulated in software, studies and tests different parts of the algorithm, especially that of the postfilter
Keywords :
adaptive filters; filtering theory; linear predictive coding; speech coding; 16 kbit/s; CCITT; G.728 encoding-decoding system; LD-CELP speech coder; adaptive postfilter; Adaptive filters; Degradation; Frequency response; Frequency synthesizers; Noise level; Noise reduction; Quantization; Signal synthesis; Speech enhancement; Speech synthesis;
Conference_Titel :
Signal Processing, 1996., 3rd International Conference on
Conference_Location :
Beijing
Print_ISBN :
0-7803-2912-0
DOI :
10.1109/ICSIGP.1996.567354
