LPAS speech coder using vector quantized, multi-codebook,...

Details LPAS speech coder using vector quantized, multi-codebook,... LPAS speech coder using vector quantized, multi-codebook,...

2005-03-08

2005-03-08

McFadden, Susan (Department: 2655)

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

C704S220000, C704S222000

Reexamination Certificate

active

06865530

ABSTRACT:
A method and apparatus for reducing the complexity of linear prediction analysis-by-synthesis (LPAS) speech coders. The speech coder includes a multi-tap pitch predictor having various parameters and utilizing an adaptive codebook subdivided into at least a first vector codebook and a second vector codebook. The pitch predictor removes certain redundancies in a subject speech signal and vector quantizes the pitch predictor parameters. Further included is a source excitation (fixed) codebook that indicates pulses in the subject speech signal by deriving corresponding vector values. Serial optimization of the adaptive codebook first and then the fixed codebook produces a low complexity LPAS speech coder of the present invention.

REFERENCES:
patent: 5371853 (1994-12-01), Kao et al.
patent: 5491771 (1996-02-01), Gupta et al.
patent: 5717823 (1998-02-01), Kleijn
patent: 5781880 (1998-07-01), Su
patent: 6014618 (2000-01-01), Patel et al.
patent: 6144655 (2000-11-01), Kim
patent: 6161086 (2000-12-01), Mukherjee et al.
patent: 6393390 (2002-05-01), Patel et al.
Schroeder, M.R. and Atal, B.S., “Code-Excited Linear Prediction (CELP) : High-Quality Speech at Very Low Bit Rates”, IEEE Proceedings of the International Conference on Acoustics, Speech and Signal Processing, 937-940 (1985).
Kroon, P. and Atal, B.S., “On Improving the Performance of Pitch Predictors in Speech Coding Systems”,Advances in Speech Coding, Kluwner Academic Publisher, Boston, Massachusetts, pp. 321-327 (1991).
Veeneman, D. and Mazor, B., “Efficient Multi-Tap Pitch Prediction for Stochastic Coding”, Speech and Audio Coding for Wireless and Network Applications, Kluwner Academic Publisher, Boston, Massachusetts, pp. 225-229 (1993).
Chen, Juin-Hwey, “Toll-Quality 16 KB/S CELP Speech Coding with Very Low Complexity”,IEEE Proceedings of the International Conference on Acoustics, Speech and Signal Processing: pp. 9-12 (1995).
“ICSPAT Speech Analysis & Synthesis”, schedule of lectures, http://www.dspworld.com/ics98c/26.htm (Jul. 28, 1998).
“Enhanced Low Memory CELP Vocoder—C5x/C2xx”, DSP Software Solutions (catalog) (Sep. 1997).

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