Invention Grant
- Patent Title: Synchronous/asynchronous independent single sideband acoustic telemetry
- Patent Title (中): 同步/异步独立单边带声学遥测
-
Application No.: US317357Application Date: 1981-11-02
-
Publication No.: US4432079APublication Date: 1984-02-14
- Inventor: Gerald R. Mackelburg , Stanley J. Watson , Alan Gordon
- Applicant: Gerald R. Mackelburg , Stanley J. Watson , Alan Gordon
- Applicant Address: DC Washington
- Assignee: The United States of America as represented by the Secretary of the Navy
- Current Assignee: The United States of America as represented by the Secretary of the Navy
- Current Assignee Address: DC Washington
- Main IPC: H04B1/68
- IPC: H04B1/68 ; H04B11/00 ; H04J1/04
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.
Public/Granted literature
- US5611167A Multidirectional deep sea fishing cannonball Public/Granted day:1997-03-18
Information query