US 4,052,692 AGranted

Accentuator circuit for underwater acoustical devices

OwnerArthur W. Freemaninventor

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Abstract

An accentuator circuit for underwater acoustical devices having a transmitter circuit and a receiver circuit each connected to underwater unit means which interchanges electrical signals and acoustical wave fronts in the water. The receiver circuit provides receiver outputs in accordance with distances traversed by the reflected wave fronts. The wave fronts reflecting from the bottom of the body of water produce a series of receiver outputs within an interval of time resulting in a bottom smear in the display in the prior art units. The invention includes an accentuator circuit connected to the receiver output comprising a series connected diode which substantially eliminates the bottom smear encountered by the prior art units enabling the resolution of an object which occurs within the aforesaid bottom smear. Consequently, objects such as fish which are located in close proximity to the bottom of the body of water can be readily detected.

Claims13

Dependent claims

A circuit for an underwater device which detects the presence of an object in a body of water, comprising in combination:

underwater unit means for interchanging electrical signals and acoustical wave fronts in the water;
a transmitter circuit connected to said underwater unit means for transmitting an acoustical wave front through the water;
a receiver circuit connected to said underwater unit means for providing receiver outputs in accordance with the distances traversed by said reflected wave fronts;
the wave fronts reflecting from the bottom of the body of water producing a series of receiver outputs within a time interval thereby obliterating a receiver output which occurs within said time interval corresponding to an object under investigation;
a detector connected to the output of said receiver circuit to have a detector output of one polarity;
and an accentuator circuit including threshold means connected in series with said detector for modifying said receiver outputs to substantially reduce the obliteration due to said series of receiver outputs to resolve said receiver output corresponding to the wave front reflecting from the object under investigation from said wave fronts reflecting from the bottom of the body of water.

3 more elements

Dependencies are inferred from the claim text.