Noise-squelching circuit using a phase-locked loop

Details Noise-squelching circuit using a phase-locked loop Noise-squelching circuit using a phase-locked loop

1974-09-17

1976-02-17

Safourek, Benedict V.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

325478, 329124, H04B 116

Patent

active

039394255

ABSTRACT:
A noise-squelching circuit in which a phase-locked loop supplies an identifiable output signal that distinguishes between those times when the voltage-controlled oscillator in the loop is locked onto an incoming carrier, and those times when it is not. This identifiable signal controls a muting circuit to allow the information modulated onto the incoming carrier to pass through the muting circuit to an output terminal only when the loop is locked to an incoming signal but not when the loop is not locked onto a carrier.

REFERENCES:
patent: 3100871 (1963-08-01), Richardson et al.
patent: 3358234 (1967-12-01), Stover
patent: 3397360 (1968-08-01), Kaneko et al.
patent: 3541449 (1970-11-01), Broderick et al.

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