Speech coding apparatus for separately processing divided signal

Details Speech coding apparatus for separately processing divided signal Speech coding apparatus for separately processing divided signal

1990-04-27

1993-12-28

Fleming, Michael R.

G10L 902

Patent

active

052747417

ABSTRACT:
A speech coding apparatus includes multipliers and prediction filters which successively process a plurality of signal vectors obtained from an index 2.sup.M and dimension N code book to obtain a reproduced speech signal. Error detectors are provided which find the error between the input speech signal and reproduced speech signal. Evaluators are also provided which calculate the optimum signal vectors giving the smallest errors. The multipliers are connected to a reduced code book, which is constituted of n number of code book blocks of index 2.sup.M
and dimension N
(where n is an integer of two or more). There are n number of multipliers, n number of prediction filters, n number of error detectors, and n number of evaluators corresponding to the code book blocks.

REFERENCES:
patent: 4817157 (1989-03-01), Gerson
patent: 4868867 (1989-09-01), Davidson et al.
patent: 5086471 (1992-02-01), Tanaka et al.
Burton et al., "Isolated-Word Speech Recognition Using Multisection Vector Quantization Codebooks", Aug. 1985, pp. 837-849, IEEE Transactions on Acoustics, Speech and Signal Processing.
Copperi et al., "CELP Coding for High-Quality Speech at 8 kbit/s", IEEE, 1986, pp. 1685-1688.
European Search Report completed Aug. 10, 1990 by Examiner Berger at Vienna.
Sharad Singhal "On Encoding Filter Parameters for Stochastic Coders" pp. 1633-1636 1987 IEEE.
M. R. Schroeder & B. S. Atal "Code-Excited Linear Prediction (CELP) High-Quality Speech at Very Low Bit Rates" pp. 937-940 1985 IEEE.

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