This paper proposes a special CELP vocoder which is able to bring the bit rate down to 2400 BPS. The auditory quality of the synthetic speech was demonstrated to be much better than the conventional coder at the bit rate of 2. 4 kbps/sec and to be equivalant to the original CELP coder at fee rate of 4. 2 kbps/sec. The simplification of the algorithm allows a real time implementation on a single chip of the TMS320C25 family while maintaining the same high quality. Keywords: Speech Coding, CELP Vocoder, Low bit-rate.
Bibliographic reference. Yang, Gao / Leich, Kenri / Boite, René (1991): "A very high-quality CELP coder at the rate of 2400 bps", In EUROSPEECH-1991, 829-832.