Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1981-05-29
1983-05-03
Rubinson, G. Z.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
179 1SW, 179 1VC, 179156A, 455 79, H04B 144
Patent
active
043821596
ABSTRACT:
In acoustical sound processing equipment, a combination microphone and blow actuated keying and unkeying means. The speaking person blows a first time into a tube to key the processing equipment and blows a second time to unkey the equipment. The person also vocalizes into the tube. The tube is in fluid communication with a chamber which houses the microphone. A blow detector senses the blowing action and triggers a bistable flip-flop which in turn drives a keying relay.
REFERENCES:
patent: 1170882 (1916-02-01), De Forest
Dwyer James L.
Rubinson G. Z.
Tighe Thomas J.
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