Adaptive pitch pulse enhancer and method for use in a codebook e

Details Adaptive pitch pulse enhancer and method for use in a codebook e Adaptive pitch pulse enhancer and method for use in a codebook e

1995-05-03

1996-06-18

MacDonald, Allen R.

395229, 395 23, 395 217, 395273, G10L 900

Patent

active

055287271

ABSTRACT:
An adaptive pitch pulse enhancer and method, adaptive to a voicing measure of input speech, for modifying the adaptive codebook of a CELP search loop to enhance the pitch pulse structure of the adaptive codebook. The adaptive pitch pulse enhancer determines a voicing measure of an input signal, the voicing measure being voiced when the input signal includes voiced speech and the voicing measure being unvoiced when the input signal does not include voiced speech, modifies a total excitation vector produced by the CELP search loop in accordance with the voicing measure of the input signal, and updates the adaptive codebook of the CELP search loop by storing the modified total excitation vector in the adaptive codebook.

REFERENCES:
patent: 5060269 (1991-10-01), Zinser
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patent: 5233660 (1993-08-01), Chen
patent: 5295224 (1994-03-01), Makamura et al.
patent: 5327520 (1994-07-01), Chen
Copper, "Efficient Excitation Modeling in a Low Bit-Rate Celp Coder," IEEE/ICASSP, 14-17 May 1991, pp. 233-236.
Taniguchi et al., "Pitch Sharpening for Perceptually Improved Celp, and the Sparse-Delta Codebook for Reduced Computation." IEEE/ICASSP, 14-17 May 1991, pp. 241-244.
ICASSP-92, vol. 1, 23 May 1992, San Francisco, pp. 65-68, Z. Xiongwei et al., "A new excitation model for LPC vocoder at 2.4 Kb/s".
Electronics & Communication Journal, vol. 4, No. 5, Oct. 1992, London, pp. 273-283, I. Boyd, "Speech coding for telecommunications".

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