Spectral squelch

Details Spectral squelch Spectral squelch

1980-04-14

1983-02-01

Chin, Tommy P.

Telecommunications

Receiver or analog modulated signal frequency converter

Squelch

455222, H04B 116

Patent

active

043719813

ABSTRACT:
A CLIMAX-network-compatible receiver with squelch capability comprises a demodulator for processing RF and IF, a squelch gate in the intelligence processing channel, and squelch gate control circuitry connected between the demodulator IF (or demodulator RF) and the squelch gate. In the control circuitry, a swept band (i.e., swept frequency) type of spectrum analyzer receives the demodulator IF and outputs a waveform whose envelope represents all the frequency components in the tested IF band. The detected envelope of the analyzer output is next treated by a compression-effecting log amplifier whose output is then tested by two different detectors for carrier attributable content and noise attributable content. The outputs of the two detectors are differenced and such difference is used to control the gate. The log amp ensures that the gate is controlled in accordance with the ratio of IF carrier to IF noise, regardless of whether IF gain variations change the difference between IF carrier and IF noise levels.

REFERENCES:
patent: 2770721 (1956-11-01), Clark
patent: 2852622 (1958-09-01), Fedde
patent: 3188571 (1965-06-01), Michael
patent: 3325738 (1967-06-01), Busby
patent: 3766479 (1973-10-01), Thalimer

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