Patent
1976-02-09
1977-08-23
Griffin, Robert L.
H04B 110
Patent
active
040443094
ABSTRACT:
A radio receiver squelch circuit operative as a function of a comparison of the audio component level of the detected signal with the noise component level, so as to amplify and pass signals when the audio component exceeds the noise component by a predetermined ratio and to shunt the signals, thus squelching any output, when the noise component exceeds the audio component by a predetermined ratio. The circuit incorporates a hysteresis function such that the audio level required to initiate squelch is less than that required to break squelch.
REFERENCES:
patent: 3325738 (1967-06-01), Busby et al.
patent: 3350650 (1967-10-01), Kemper
patent: 3538253 (1970-11-01), Braun
patent: 3873926 (1975-03-01), Wright
patent: 3894285 (1975-07-01), Schaeperkoetter
Bookbinder Marc E.
Griffin Robert L.
Narco Scientific Industries, Inc.
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