Speech coding and decoding system

Details Speech coding and decoding system Speech coding and decoding system

1991-09-18

1993-03-30

Kemeny, Emanuel S.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

381 49, G10L 500

Patent

active

051990768

ABSTRACT:
A CELP type speech coding system is provided with an arithmetic processing unit which transforms a perceptual weighted input speech signal vector AX to a vector .sup.t AAX, a sparse adaptive codebook which stores a plurality of pitch prediction residual vectors P sparsed by a sparse unit, and a multiplying unit which multiplies the successively read out vectors P and the output .sup.t AAX from the arithmetic processing unit. In addition, the CELP type speech coding system includes a filter operation unit which performs a filter operation on the vectors P, and an evaluation unit which finds the optimum vector P based on the output from the filter operation unit, so as to enable reduction of the amount of arithmetic operations.

REFERENCES:
patent: 4860355 (1989-08-01), Copperi
patent: 4868867 (1989-09-01), Davidson et al.
patent: 4991214 (1991-02-01), Freeman et al.
patent: 5027405 (1991-06-01), Ozawa
patent: 5091946 (1992-02-01), Ozawa
W. B. Kleijn Fast Methods for the CELP Speech Coding Algorithm, pp. 1330-1342 IEEE Trans. ASSP, vol. 38, No. 8 (Aug. 1990).

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