Communications – electrical: acoustic wave systems and devices – Underwater system – Remote control
Patent
1996-04-08
1997-12-23
Lobo, Ian J.
Communications, electrical: acoustic wave systems and devices
Underwater system
Remote control
367131, 367134, 340850, H04B 1100
Patent
active
057012768
ABSTRACT:
An underwater communication system by coded pulses, includes a transmitter placed at a surface of a body of water, for transmitting coded pulses, the transmitter having a transmitter circuit for generating the coded pulses, the transmitter circuit including a first shift register pre-programmed with a binary code corresponding to the coded pulses, and an underwater piezoelectric transducer for submersion in the water and electrically connected with the transmitter circuit for transmitting the coded pulses through the water; an underwater receiver for receiving the transmitted coded pulses, without any physical connection between the transmitter and receiver, the receiver having an underwater piezoelectric transducer, submerged in the water, for receiving the transmitted coded pulses, and a receiver circuit for comparing the received code pulses with stored coded pulses, the receiver circuit including an amplifier for amplifying the received coded pulses, an internal clock generator for generating a clock signal, a circuit for synchronizing the received and amplified coded pulses with the generated clock signal, a second shift register pre-programmed with the binary code corresponding to the coded pulses, and a comparator for comparing the received coded pulses with the code pre-programmed into the second memory, to verify that the received coded pulses correspond to the code pre-programmed into the second memory; and an actuator for releasing a submerged object in response to verification by the comparator that the received coded pulses correspond to the code pre-programmed into the second memory.
REFERENCES:
patent: 3274537 (1966-09-01), Toulis
patent: 3732534 (1973-05-01), Koomey et al.
patent: 3737857 (1973-06-01), Carman
patent: 3742440 (1973-06-01), Ehrlich et al.
patent: 4020449 (1977-04-01), Ito et al.
patent: 5121366 (1992-06-01), Wayner et al.
Goldberg Richard M.
Lobo Ian J.
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