Acoustic foghorn for directional signaling

Details Acoustic foghorn for directional signaling Acoustic foghorn for directional signaling

1975-08-20

1977-02-08

Farley, Richard A.

Communications: electrical

Selective

System having rectifier

340 3A, 340 5R, 343106R, G01S 172

Patent

active

040074374

ABSTRACT:
A method of creating a highly directional acoustic beam that can be swept er the water near the entrance of a harbor or channel location. The information provided to a boat operator as a result of the acoustic beam includes the operator's absolute bearing from the acoustic source. The nonlinear acoustic beam has a narrow beamwidth and is produced by small transducers that can be rotated in a selected scanning motion to provide a sequence of acoustic signals easily recognizable by the unaided human air of the boat operator who is cognizant of the acoustic sequence.

REFERENCES:
patent: 1961767 (1934-06-01), Key
patent: 2112283 (1938-03-01), Fritz
patent: 2297395 (1942-09-01), Erben
patent: 3721950 (1973-03-01), Jorgensen et al.
patent: 3723957 (1973-03-01), Damon

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