Automatic threshold squelch

Details Automatic threshold squelch Automatic threshold squelch

1981-07-27

1983-10-18

Ng, Jin F.

Telecommunications

Receiver or analog modulated signal frequency converter

Squelch

455225, H04B 110

Patent

active

044110219

ABSTRACT:
An automatic threshold squelch circuit, responsive to noise signals from the receiver demodulator, having automatic means for setting the squelch level. A noise detector is coupled to the demodulator and to a comparator and sample and hold circuit such that a predetermined portion of the detected noise signal level is stored in the sample and hold circuit when no signal is being received. The stored noise level is then compared to the detected noise signal from the noise detector and a mute signal is generated in response to the detected noise level exceeding the stored signal level.

REFERENCES:
patent: 3437937 (1969-04-01), Warfield
patent: 3633112 (1972-01-01), Anderson
patent: 3934206 (1976-01-01), Holcek

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