This paper proposes high-quality and low bit-rate (3.6 and 2.4 kbit/s) coders using a Pitch Synchronous Innovation CELP (PSI-CELP) method or a phase adaptive PSI-CELP. PSI-CELP, which is used as the excitation structure of the half-rate codec for the standard of Japanese digital mobile telephony, is based on CELP but adds pitch synchronous innovation, which means that even random codevectors are adaptively converted to have pitch periodicity for voiced frames. Phase adaptive PSI-CELP makes not only the periodicity, like in PSI-CELP, but, also the phase of random codevectors equal to those of an adaptive codevector. The subjective qualities of the 3.6- and 2 . 4 kbit/s coders exceed those of the 6.7-kbit/s VSELP coder, which is the full-rate codec for the standard of Japanese digital mobile telephony, and the 4.8-kbit/s U.S. Federal Standard 1016 CELP coder, respectively, in the error-free condition.
|Journal||ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings|
|Publication status||Published - 1994|
|Event||Proceedings of the 1994 IEEE International Conference on Acoustics, Speech and Signal Processing. Part 2 (of 6) - Adelaide, Aust|
Duration: 1994 Apr 19 → 1994 Apr 22
ASJC Scopus subject areas
- Signal Processing
- Electrical and Electronic Engineering