Constant amplitude interference squelch system

Details Constant amplitude interference squelch system Constant amplitude interference squelch system

1976-08-20

1979-03-06

Griffin, Robert L.

179 1P, H04B 110

Patent

active

041433254

ABSTRACT:
A squelch circuit for muting constant amplitude interference when the signal is absent. The input wave's envelope characteristic is examined so as to determine if the envelope is constant and, if it is, a gate is controlled so that the input wave is muted. Time delay circuitry is provided in one embodiment in order to provide sufficient time to make a determination that constant amplitude interference is present rather than variable amplitude speech before muting the input wave.

REFERENCES:
patent: 3102236 (1963-08-01), Eichenberger et al.
patent: 3350650 (1967-10-01), Kemper
patent: 3397401 (1968-08-01), Winterbottom

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