LPC Word recognizer utilizing energy features

Details LPC Word recognizer utilizing energy features LPC Word recognizer utilizing energy features

1982-08-26

1985-05-21

Kemeny, E. S. Matt

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

3645135, G10L 100

Patent

active

045190941

ABSTRACT:
In a speech recognition arrangement, a speech pattern is recognized as one of a plurality of reference patterns for which acoustic feature signal templates are stored. Each template includes a time frame (e.g., 10 millisecond) sequence of spectral features e.g., LPC and nonspectral e.g., acoustic energy (E) normalized to the peak energy over an utterance interval. LPC and normalized energy feature signal sequences are produced for an unknown speech pattern. For each time frame, the correspondence between the LPC features of the speech pattern and each reference is measured as well as the correspodence between the energy (E) features. In comparing the unknown speech features to those of the reference templates, the dynamic time warp distance DT=D.sub.LPC +.alpha.D.sub.E is used where .alpha. is a weighting factor selected to minimize the probability of erroneous recognition.

REFERENCES:
patent: 3916105 (1975-10-01), McCray
patent: 4156868 (1979-05-01), Levinson
patent: 4282403 (1981-08-01), Sakoe
patent: 4319085 (1982-03-01), Welch et al.

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