Method of evaluating speech

Details Method of evaluating speech Method of evaluating speech

1987-04-06

1989-08-22

Kemeny, Emanuel S.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

381 46, 381 47, G10L 908

Patent

active

048603600

ABSTRACT:
A method of evaluating the quality of speech in a voice communication system is used in a speech processor. A digital file of undistorted speech representative of a speech standard for a voice communication system is recorded. A sample file of possibly distorted speech carried by said voice communication system is also recorded. The file of standard speech and the file of possibly distorted speech are passed through a set of critical band filters to provide power spectra which include distorted-standard speech pairs. A variance-covariance matrix is calculated from said pairs, and a Mahalanobis D.sup.2 calculation is performed on said matrix, yielding D.sup.2 data which represents an estimation of the quality of speech in the sample file.

REFERENCES:
patent: 3634759 (1972-01-01), Tokorozawa et al.
patent: 4220819 (1980-09-01), Atal
patent: 4509133 (1985-04-01), Monbaron et al.
patent: 4592085 (1986-05-01), Watari et al.
patent: 4651289 (1987-03-01), Maeda et al.
Klatt, "A Digital Filter Bank for Spectral Matching", IEEE ICASSP, 1976, pp. 573-576.
Campbell et al., "Voiced/Unvoiced Classification of Speech with Applications to the U.S. Government LPC-10E Algorithm", ICASSP 86, Tokyo, pp. 473-476, 1986.

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