Method for improving speech quality in code excited linear predi

Details Method for improving speech quality in code excited linear predi Method for improving speech quality in code excited linear predi

1989-10-26

1990-12-25

Kemeny, Emanuel S.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

381 31, 381 49, 381 38, 381 47, G10L 500

Patent

active

049809164

ABSTRACT:
By reconciling differences between the estimator and the filter of a code excited linear predictive (CELP) voice coder, higher quality is achieved in the output speech. The pulse amplitudes and pitch tap gain are solved for simultaneously to minimize the estimator bias in the CELP excitation. Increased signal to noise ratio is accomplished by modifying the pitch predictor such that the pitch synthesis filter accurately reflects the estimation procedure used to find the pitch tap gain, and by improving the excitation analysis technique such that the pitch predictor tap gain and codeword gain are solved for simultaneously, rather than sequentially. These modifications do not result in an increased transmission rate or significant increase in complexity of the CELP coding algorithm.

REFERENCES:
B. S. Atal and M. R. Schroeder, "Stochastic Coding of Speech Signals at Very Low Bit Rates", Proc. of 1984 IEEE Int. Conf. on Communications, May 1984, pp. 1610-1613.
M. R. Schroeder and B. S. Atal, "Code-Excited Linear Prediction (CELP): High Quality Speech at Very Low Bit Rates", Proc. of 1985 IEEE Int. Conf. of Acoustics, Speech, and Signal Processing, Mar. 1985, pp. 937-940.
B. S. Atal, and J. R. Remde, "A New Model of LPC Excitation for Producing Natural Sounding Speech at Low Bit Rates", Proc. of 1982 IEEE Int. Conf. on Acoustics, Speech, and Signal Processing, May 1982, pp. 614-617.
P. Kroon and B. S. Atal, "Strategies for Improving the Performance of CELP Coders at Low Bit Rates", Proc. of 1988 Int. Conf. on Acoustics, Speech, and Signal Processing, Apr. 1982, pp. 151-154.
B. S. Atal, "Predictive Coding of Speech at Low Bit Rates", IEEE Transactions on Communications, vol. COM-30, Apr. 1982, pp. 600-614.

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