Communications – electrical: acoustic wave systems and devices – Underwater system – Analog speech communication
Patent
1981-11-02
1984-02-14
Farley, Richard A.
Communications, electrical: acoustic wave systems and devices
Underwater system
Analog speech communication
367134, 455 40, 455103, 455104, H04B 1100
Patent
active
044320795
ABSTRACT:
An undersea communications system provides for improved data transmission pabilities. Two separate sources of information respectively modulate the upper and the lower sidebands of an acoustic carrier. The discretely modulated sidebands are simultaneously transmitted without the acoustic carrier or the acoustic carrier can be added to allow asynchronous or synchronous demodulation and use of the two modulating informations. Separation of the information in the two discretely modulated sidebands is assured by shifting the modulating information to ultrasonic regions and filtering out upper and lower sidebands of modulating information. Next, the shifted sidebands are modulated by an acoustic carrier which, optionally, is transmitted along with the discretely modulated upper and lower sidebands. A phase locked loop in the receiver portion assures synchronous demodulation or a crystal oscillator allows asynchronous demodulation of the discretely modulated upper and lower sidebands.
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Gordon Alan
Mackelburg Gerald R.
Watson Stanley J.
Beers R. F.
Farley Richard A.
Johnston Ervin F.
Keough Thomas Glenn
The United States of America as represented by the Secretary of
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