Squelch control circuit for amplitude modulated RF receivers

Details Squelch control circuit for amplitude modulated RF receivers Squelch control circuit for amplitude modulated RF receivers

1980-04-17

1982-10-19

Ng, Jin F.

Telecommunications

Receiver or analog modulated signal frequency converter

Squelch

455237, 455310, H04B 110

Patent

active

043554172

ABSTRACT:
A noise squelching circuit for an AM radio in which a phase-locked loop extracts a tone signal which gates an audio frequency amplifier. Tone injection can be accomplished either by frequency modulating the intermediate frequency signal or the output of the phase-locked loop's voltage controlled oscillator.

REFERENCES:
patent: 2853601 (1958-09-01), McKenna et al.
patent: 3100871 (1963-08-01), Richardson et al.
patent: 3320535 (1967-05-01), Broadhead, Jr.
patent: 3358234 (1967-12-01), Stover
patent: 3939425 (1976-02-01), Toyoshima

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