5th International Conference on Spoken Language Processing

Sydney, Australia
November 30 - December 4, 1998

A 16 Kbit/s Wideband CELP Coder Using MEL-Generalized Cepstral Analysis and its Subjective Evaluation

Kazuhito Koishida (1), Gou Hirabayashi (2), Keiichi Tokuda (3), Takao Kobayashi (4)

(1) University of California, Santa Barbara, USA
(2) Toshiba Corporation, Japan
(3) Nagoya Institute of Technology, Japan
(4) Tokyo Institute of Technology, Japan

We have proposed a wideband CELP coder, called MGC-CELP, which provides high quality speech by utilizing mel-generalized cepstral (MGC) analysis instead of linear prediction (LP). In this paper, we investigate the performance of the wideband MGC-CELP coder at 16 kbit/s in terms of short-term predictor order, i.e., order of MGC analysis. Subjective tests show that the MGC-CELP coder with a predictor of order 20 gives better performance than ITU-T G.722 at 64 kbit/s. It is also found that the MGC-CELP coder with 12th order achieves comparable quality to the 64 kbit/s G.722, and outperforms the 16 kbit/s conventional CELP coder using 20th-order LP analysis under the same conditions.

Full Paper

Bibliographic reference.  Koishida, Kazuhito / Hirabayashi, Gou / Tokuda, Keiichi / Kobayashi, Takao (1998): "A 16 kbit/s wideband CELP coder using MEL-generalized cepstral analysis and its subjective evaluation", In ICSLP-1998, paper 0904.