Acoustic Foghorn for Directional Signaling.

摘要

The patent application describes a method of creating a highly directional acoustic beam that can be swept over 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 ear of the boat operator who is cognizant of the acoustic sequence.