Celp-type speech encoder having an improved long-term predictor

Details Celp-type speech encoder having an improved long-term predictor Celp-type speech encoder having an improved long-term predictor

1995-12-27

1999-07-13

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704220, 704219, 704207, G10L 302, G10L 900

Patent

active

059240636

ABSTRACT:
A speech signal encoder includes a speech analyzer for determining short-term prediction codes at a predetermined time interval. The prediction codes indicate frequency characteristics of a speech signal. A reverse filter is provided for calculating residual signals of first synthesis filter. The residual signals are defined by the short-term prediction codes. A residual code book stores past residual signals. Further, a plurality of delay codes, each of which represents pitch correlation of the speech signal, are predetermined. A vector generator issues, using the residual code book, delay residual vectors each of which corresponds to the delay code. A filter is provided for generating a synthesis signal using second synthesis filter which receives the delay residual vectors and which is defined by the short-term prediction codes. A distance between the speech signal and the synthesis signal is calculated. Subsequently, a pitch path estimator estimates a pitch path which varies smoothly. The pitch path thus estimated is used for determining a delay code.

REFERENCES:
patent: 5233660 (1993-08-01), Chen
patent: 5359696 (1994-10-01), Gerson et al.
Low-Delay Vector Excitation Coding of Speech at 8 kbit/s, by Jy-Hsin Yao et al.; Globecom '91.
Interpolation of the Pitch-Predictor Parameters in Analysis-by-Synthesis Speech Coders, by Kleijn, et al., IEEE Transactions on Speech and Audio Processing, Jan. 2, 1994, Part 1.
Efficient Techniques for Determining And Encoding the Long Term Predictor Lags for Analysis-by-Synthesis Speech Coders, by Gerson et al., Corporate Systems Research Laboratories, Motorola.
Ahmed, M E et al, Fast Code Search in CELP IEEE, Trans Spch and Audio, vol. 1, No. 3, pp. 315-325, Jul. 1993.
P. Kroon et al., "Pitch Predictors with high Temporal Resolution", IEEE 1990, CH2847-2/90/0000-0661, pp. 661-664.
I.A. Gerson et al., "Techniques for Improving the Performance of CELP-Type Speech Coders", IEEE Journal on Selected Areas in Communications, vol. 10, No. 5, Jun. 1992, pp. 858-865.
M. R. Schroeder et al., "Code-Excited Linear Prediction (CELP): High-Quality Speech at very Low bit Rates", IEEE 1985, Ch2118-8/85/0000-0937, pp. 937-940.

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