Method and apparatus for speech detection of PCM multiplexed voi

Details Method and apparatus for speech detection of PCM multiplexed voi Method and apparatus for speech detection of PCM multiplexed voi

1976-05-10

1977-12-06

Stewart, David L.

179 1VC, 179 15AS, G10L 104

Patent

active

040618781

ABSTRACT:
The disclosure herein describes a method and a system for speech detection on PCM multiplexed voice channels; for each channel, a decision is reached every M samples regarding the channel activity; in addition, the nature of speech is detected as: voiced (compact or non-compact) or unvoiced (fricative or non-fricative) when the channel is active; pure silence, white noise or echo when the channel is inactive. The decision is based on the joint value of the amplitude, zero crossing of the signal and zero crossing of the signal derivative.

REFERENCES:
patent: 3878337 (1975-04-01), Fariello
patent: 3985956 (1976-10-01), Monti

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