Electro-acoustic device for the underwater signalling and identi

Details Electro-acoustic device for the underwater signalling and identi Electro-acoustic device for the underwater signalling and identi

1980-08-13

1982-06-15

Farley, Richard A.

Communications, electrical: acoustic wave systems and devices

Underwater system

Telemetering

367138, H04B 1100

Patent

active

043354521

ABSTRACT:
The underwater signalling and identification device comprises an emitter (5) having four submerged transducers (10 to 13) arranged to form a square and fitted in a water-tight case (25) placed above an opening (7) formed in the hull of a ship, and also comprises a transducer-control circuit designed to emit an identification signal specific to the vessel and made up of a series of figures or letters in Morse code, the signal being emitted at at least one frequency selected as a function of the sound spectrum of the vessel and falling within the range of 4 to 6 kHz, the strength of emission of the signal being in accordance with the relationship

REFERENCES:
patent: 3336571 (1967-08-01), Johnson et al.
patent: 4122430 (1978-10-01), Leisterer et al.

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