Audio frequency automatic muting arrangement

Details Audio frequency automatic muting arrangement Audio frequency automatic muting arrangement

1976-11-30

1978-07-04

Griffin, Robert L.

325348, H04B 110

Patent

active

040991270

ABSTRACT:
An audio frequency muting arrangement includes one circuit for detecting intelligence signals in a received audio frequency signal, and a further circuit for detecting noise signals, so as to compare the levels of the noise and intelligence signals and to control a muting switch in dependence thereon. The invention is applicable to noisy environments, e.g. aircraft, in which a threshold circuit is used to track the ambient noise level. Particular signal detection circuits are described.

REFERENCES:
patent: 2802939 (1957-08-01), Klehfoth
patent: 3011052 (1961-11-01), Busby
patent: 3568068 (1971-03-01), Russell, Jr. et al.
patent: 3805166 (1974-04-01), Paredes

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