Method for reducing the search complexity in analysis-by-synthes

Details Method for reducing the search complexity in analysis-by-synthes Method for reducing the search complexity in analysis-by-synthes

1990-03-15

1992-09-01

Kemeny, Emanuel S.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

364419, 381 47, G10L 500, A61F 1538

Patent

active

051446715

ABSTRACT:
A method of encoding speech includes a limited search of a tree-code excitation codebook with a closed loop gain calculation for each test path under consideration. The gain calculation occurs when minimizing an error distance measurement between a synthetic signal defined by each test path being considered and the appropriate speech signal by optimizing a scaling factor of the synthetic signal. The encoding method achieves a significant reduction in computational complexity with minimal loss of performance.

REFERENCES:
Atal et al, "Stochastic Coding of Speech at Very Low Bit Rates" Proc. IEEE Int. Conf. Comm., pp. 1610-1613 (Apr. 1984).
Trancoso et al, "Efficient procedures for finding the optimum innovation in stochastic coders," Proc. IEEE Int. Conf. Acoust., Speech, Signal Processing, pp. 2375-2378 (Apr. 1986).
Anderson, "Tree Coding of Speech," IEEE Trans. Inform. Theory, vol. IT-21, pp. 379-387 (Jul. 1975).
Lin, "Speech coding using efficient pseudo-stochastic block codes," Proc. IEEE Int. Conf. Acoust., Speech, Signal Processing, pp. 1354-1357 (Apr. 1987).

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