Noise-memory regulated squelch compensator

Details Noise-memory regulated squelch compensator Noise-memory regulated squelch compensator

1979-02-22

1981-05-12

Ng, Jin F.

Telecommunications

Transmitter and receiver at same station

With transmitter-receiver switching or interaction prevention

455219, H04B 144, H04B 110

Patent

active

042675987

ABSTRACT:
A noise-memory regulated squelch compensating circuit for receivers using AGC voltage dependent squelch is disclosed. This compensating circuit cancels the gradual change in AGC voltage component at the squelch control that is due to the gradual rise and decay of diurnal noise at the receiver input. This is accomplished by summing this change in AGC voltage component with an equal but opposite voltage change determined by the charge on a memory capacitor updated by a noise level detector diode. Thus the relatively constant level at the squelch control during no signal conditions makes readjustment of the control unnecessary regardless of diurnal noise level change.

REFERENCES:
patent: 3719892 (1973-03-01), Yamazaki et al.
patent: 4060764 (1977-11-01), Bethards et al.
patent: 4158814 (1979-06-01), Imazeki et al.

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