Speech coding system

Details Speech coding system Speech coding system

1991-06-18

1993-09-14

Kemeny, Emanuel S.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

395 2, G10L 500

Patent

active

052456625

ABSTRACT:
A speech coding system operated under a known code-excited linear prediction (CELP) coding method. The CELP coding is achieved by selecting an optimum pitch vector P from an adaptive codebook and the corresponding first gain and, at the same time, selecting an optimum code vector from a sparse-stochastic codebook and the corresponding second gain. Special code vectors are loaded in the sparse-stochastic codebook, which code vectors are hexagonal lattice code vectors each consisting of a zero vector with one sample set to +1 and another sample set to -1.

REFERENCES:
Gerson, et al., "Vector Sum Excited, etc.", Proceedings, ICASSP 90, 1990 International Conference on Acoustics, Speech, and Signal Processing, Apr. 3-6, 1990, IEEE Processing Society, pp. 461-464.
Advances in Speech Coding, (IEEE Workship on Speech Coding for Telecommunications), Vancouver, Sep. 5-8, 1989, "An Efficient Variable-Bit-Rate Low-Delay CELP (VBR-LD-CELP) Coder", W. Be'ery et al., pp. 37-46.
ICASSP'87, (1987 International Conference on Acoustics, Speech and Signal Processing), Dallas, Tex., Apr. 6-9, 1987, vol. 4, "A Comparision of Some Algebraic Structures for CELP Coding of Speech", J. P. Adoul et al., pp. 1953-1956.
ICASSP'89, (1989 International Conference on Acoustics, Speech, and Signal Processing), Glasgow, May 23-26, 1989, vol. 1, "Fast CELP Coding Based on the Barnes-Wall Lattice in 16 Dimensions", C. Lamblin et al., pp. 61-64.
ICASSP'89, (1989 International Conference on Acoustics, Speech, and Signal Processing), Glasgow, May 23-26, 1989, vol. 1, "On Improving Vector Excitation Coders Through the Use of Spherical Lattice Codebooks", M. A. Ireton et al., pp. 57-60.
ICASSP'90, (1990 International Conference on Acoustics, Speech, and Signal Processing), Albuquerque, N.M., Apr. 3-6, 1990, vol. 1, "Optimal and Sub-Optimal Algorithms for Selecting the Excitation in Linear Predictive Coders", P. Dymarski et al., pp. 485-488.
WO-A-9 101 545 (Motorola Inc.).

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