Code excited linear prediction coder with a short-length codeboo

Details Code excited linear prediction coder with a short-length codeboo Code excited linear prediction coder with a short-length codeboo

1995-06-14

1997-12-16

MacDonald, Allen R.

395 227, 395 229, 395 231, 395 232, G10L 914

Patent

active

056994834

ABSTRACT:
A predicted residual signal is calculated from a current input speech signal and a past input speech signal, and a cross-correlation between the predicted residual signal and the past input speech signal having one speech sub-frame length stored in a first code book is calculated. In cases where the current input speech signal has no local peak, the cross-correlation becomes high, so that a synthesized speech signal is generated from the past input speech signal stored in the first code book or a predetermined sound source signal having one speech sub-frame length stored in the second code book. In contrast, in cases where the current input speech signal has a local peak, the cross-correlation becomes low, so that it is judged that a function of the first code book is depressed. In this case, a synthesized speech signal is generated from a group of short-length sound source signals having a total length equal to one speech sub-frame length stored in a short-length signal code book. Therefore, even though the current input speech signal suddenly has a local peak, because the synthesized speech signal is generated from the short-length sound source signals respectively having a speech length lower than one speech sub-frame length, the local peak can be expressed by the short-length sound source signals, an appropriate exciting sound source signal similar to the current input speech signal can be determined, and the synthesized speech signal can be adequately obtained.

REFERENCES:
patent: 4852179 (1989-07-01), Fette
patent: 5086439 (1992-02-01), Asai et al.
patent: 5194950 (1993-03-01), Murakami et al.
patent: 5208862 (1993-05-01), Ozawa
Kazunori Ozawa, Masahiro Serisawa, Tohiki Miyano, and Toshiyuki Nomura, "M-LCELP Speech Coding at 4 KBPS", Proceedings of the IEEE ICASSP '94, p.I.269-I.272, Apr. 1994.
Andreas S. Spanias, "Speech Coding: A Tutorial Review", Proceedings of the IEEE, vol. 82, pp. 1541-1582, Oct. 1994.

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