Communications: electrical – Selective – Intelligence comparison for controlling
Patent
1977-08-08
1978-10-10
Farley, Richard A.
Communications: electrical
Selective
Intelligence comparison for controlling
340 3E, H04B 1100
Patent
active
041199413
ABSTRACT:
An acoustic coupler is provided for extending the listening and signal garing capabilities of an existing cable connected hydrophone system. The acoustic coupler includes a sensor, such as an additional hydrophone, an acoustic projector, and a cable which electrically connects the acoustic projector to the additional hydrophone. A modulator is interconnected in the cable between the projector and the additional hydrophone for modulating signals received by the additional hydrophone on a carrier wave which is within the bandpass of the existing hydrophone. With this arrangement the acoustic projector can be placed in water within listening distance of the existing hydrophone so that signals from the additional hydrophone can be transmitted over the existing hydrophone and its cable system.
REFERENCES:
patent: 3145365 (1964-08-01), Jacobs
patent: 3277428 (1966-10-01), Sampsell
patent: 3517378 (1970-06-01), Barrett
patent: 4069469 (1978-01-01), Masaharu
Mitson et al., Deep Sea Research, vol. 14, pp. 259-270, Apr. 1967.
Beaman George R.
Graham, Jr. Craig W.
Hightower John D.
Moore Donald K.
Farley Richard A.
Johnston Ervin F.
Sciascia Richard S.
The United States of America as represented by the Secretary of
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