Speech analysis/synthesis system with silence suppression

Details Speech analysis/synthesis system with silence suppression Speech analysis/synthesis system with silence suppression

1983-10-13

1987-09-22

Kemeny, E. S. Matt

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

379 88, G10L 500

Patent

active

046960392

ABSTRACT:
Silence suppression in speech synthesis systems is achieved by detecting and processing only segments of voice activity. A segment is classified as "speech" if the energy of the signal is greater than an adaptively adjusted threshold. The adaptively adjusted threshold is preferably defined as the maximum of scaled values of two separate envelope parameters, which both track the variation in energy over the sequence of frames of speech data. One contour is a slow-rising fast-falling value, which is updated only during unvoiced speech frames, and therefore track a lower envelope of the energy contour. This parameter in effect tracks an ambiant noise level. The other parameter is a fast-rising slow-falling parameter, which is updated only during voiced speech frames, and thus tracks an upper envelope of the energy contour. (This in effect tracks the average speech level.) A nonsilent energy tracker and a silent energy tracker adjust corresponding energy values representing the energy contours.

REFERENCES:
patent: 4158749 (1979-06-01), Deman
patent: 4331837 (1982-05-01), Soumagne
patent: 4351983 (1982-09-01), Crouse et al.
Irvin, "Voice Activity Detector", IBM Tech Discl Bull, Dec. 1982.

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