Speech coding and decoding system

Details Speech coding and decoding system Speech coding and decoding system

1997-03-03

1998-08-25

MacDonald, Allen R.

395 215, 395 231, 395 232, G10L 916

Patent

active

057991316

ABSTRACT:
A speech coding and decoding system, where the system is operated under a known code-excited linear prediction (CELP) coding method. The CELP coding is achieved by selecting an optimum pitch prediction residual vector P from an adaptive codebook and the corresponding first gain, and at the same time, selecting an optimum code vector C from a white-noise stochastic codebook and the corresponding second gain. The system of the present invention is implemented by a weighted orthogonalization transforming unit introduced therein. The perceptually weighted code vector AC is not used as in the prior art. Rather, the weighted orthogonalization transformation unit transforms the code vector into a perceptually weighted reproduced code vector AC' being made orthogonal to the optimum perceptually weighted pitch prediction vector AP.

REFERENCES:
patent: 4821324 (1989-04-01), Ozawa et al.
patent: 4896361 (1990-01-01), Gerson
patent: 4899385 (1990-02-01), Ketchum et al.
Dymarski et al., "Optimal and sub-optimal algorithms for selecting the excitation in linear predictive coders", ICASSP 90, pp. 485-488, Apr., vol. 1, 1990.
Proceedings, ICASSP 90, 1990 International Conference on Acoustics, Speech, and Signal Processing Apr. 3-6, 1990, IEEE Signal Processing Society, pp. 461 to 464.

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