This paper deals with the design and performance evaluation of a CELP codec at 3.5 kbit/s based on multi-path search methods. The rationale of this approach stems from the fact that delayed-decision coding algorithms outperform conventional techniques, in which the parameters to be transmitted are optimized sequentially. Tree codes have been applied to both the spectral information, quantized via a multi-stage vector quantizer, and the excitation codevectors, along with relative optimal gains. Preliminary results of this study show that the proposed scheme is a viable approach for achieving good speech quality at bit-rates below 4 kbit/s.
Cite as: Copperi, M. (1992) A low bit-rate CELP coder based on multi-path search methods. Proc. 2nd International Conference on Spoken Language Processing (ICSLP 1992), 25-28, doi: 10.21437/ICSLP.1992-9
@inproceedings{copperi92_icslp,
author={Maurizio Copperi},
title={{A low bit-rate CELP coder based on multi-path search methods}},
year=1992,
booktitle={Proc. 2nd International Conference on Spoken Language Processing (ICSLP 1992)},
pages={25--28},
doi={10.21437/ICSLP.1992-9}
}