Speech signal presence detector

Details Speech signal presence detector Speech signal presence detector

1975-04-03

1977-01-04

Claffy, Kathleen H.

179 1P, 179 1HF, G10L 104

Patent

active

040015050

ABSTRACT:
A speech detector which rapidly detects the presence of speech signals in telephone channel broadband noise is useful in TASI type systems. The incoming analog speech signal is sampled and binary-coded, then fed simultaneously to two different detectors: (1) A large-amplitude threshold detector (which detects high-energy vowel and plosive sounds): (2) a high-frequency threshold detector (which detects high-frequency fricative sounds above a 2 Khz threshold, assuming inherent noise in a 4 Khz telephone channel is mostly flat/broadband and 8 Khz sampling noise is filtered out).

REFERENCES:
patent: 3278685 (1966-10-01), Harper
patent: 3488446 (1970-01-01), Miller
patent: 3507999 (1970-04-01), Schroeder
Nemeth, A. "Detection of Excitation Times . . . Voice Frequency" IBM Tech. Disclosure Bull. vol. 15, No. 11, Apr. 1973.

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