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

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

1998-08-06

2000-01-11

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704219, 704220, 704222, 704223, G10L 900

Patent

active

060146184

ABSTRACT:
A method and apparatus for reducing the complexity of linear prediction analysis-by-synthesis (LPAS) speech coders. The method and apparatus include product code vector quantization (PCVQ) of multi-tap pitch predictor coefficients, which reduces the search and quantization complexity of an adaptive codebook. Further included is a procedure for generating and selecting code vectors consisting of ternary (1,0,-1) values, for optimizing a fixed codebook. Serial optimization of the adaptive codebook first and then the fixed codebook, produces a low complexity LPAS speech coder of the present invention.

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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).
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