Title :
Multi-band residual coding of CELP codecs at 8 kb/s
Author :
Mermelstein, P. ; Zheng, P. ; Saikaly, M.
Author_Institution :
INRS Telecommun., Montreal, Que., Canada
Abstract :
We explore the benefits for CELP coding of speech at 8 kb/s of dividing the residual signal after pitch filtering into three band-passed components and using separate codebooks to represent each component. Minimization of the perceptually weighted error between the input signal and the reconstructed signal is divided into several band-limited minimization operations where the lowest frequency match dominates the quality of the result. For equal total numbers of bits allocated to code the residual in a 5 ms frame, spectral division of the coding operation results on the average in a better match than temporal division into subframes. These results permit the design of a high quality speech codec at 8 kb/s with modest delay and low complexity
Keywords :
arithmetic codes; linear predictive coding; minimisation; speech codecs; speech coding; 8 kbit/s; CELP codecs; band-limited minimization operations; benefits; codebooks; coding operation; complexity; delay; design; input signal; minimization; multi-band residual coding; perceptually weighted error; pitch filtering; reconstructed signal; residual signal; spectral division; speech coding; subframes; temporal division; three band-passed components; Adaptive systems; Band pass filters; Conferences; Delay; Filtering; Frequency conversion; Linear predictive coding; Shape; Speech codecs; Speech coding;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 1994. ICASSP-94., 1994 IEEE International Conference on
Conference_Location :
Adelaide, SA
Print_ISBN :
0-7803-1775-0
DOI :
10.1109/ICASSP.1994.389704
