Signal processor for analyzing distortion of speech signals

Details Signal processor for analyzing distortion of speech signals Signal processor for analyzing distortion of speech signals

1990-03-05

1992-06-02

Shaw, Dale M.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

381 36, G10L 914

Patent

active

051194236

ABSTRACT:
A speech coder utilizing previously stored sound source vectors to generate synthetic speech, a distortion computing circuit for computing a distortion of synthetic speech from input speech and a selection circuit for selecting the sound source vector that provides minimum distortion. Sound source vectors are stored within a plurality of reduced size code books rather than a single larger code book. A vector adder adds the sound source vectors respectively output from each of the reduced code books thereby generating a single sound source vector for comparison with the input speech. The distortion circuit computes the distortion for this sound source vector by analyzing the sound source vectors respectively output from each of the reduced code books in addition to the sound source vector output from the vector adder. The computational complexity required to determine the distortion is greatly reduced from the complexity required if a single larger code book of sound source vectors is utilized.

REFERENCES:
patent: 4817157 (1989-03-01), Gerson
patent: 4827517 (1989-05-01), Atal et al.
patent: 4868867 (1989-09-01), Davidson et al.
patent: 4910781 (1990-03-01), Ketchum et al.
"Code-Excited Linear Prediction (CELP): High-Quality Speech At Very Low Bit Rates", Schroeder et al., IEEE ICASSP, 1985, pp. 937-940.
"Efficient Procedures For Finding The Optimum Innovation In Stochastic Coders", Trancoso et al., IEEE ICASSP 86, pp. 2375-2378.

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