Importance

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Abstract

A sonar device for use on a boat to indicate the depth of water on a digital display, including a transducer positioned in the water to transmit bursts of sound energy and for receiving echo energy reflected from the bottom, at least one variable gain receiver stage for amplifying the echo signals received by the transducer, a microprocessor for processing the amplified received signals to supply appropriate control signals to the digital display to indicate depth as a function of time required to receive echo signals, a means of controlling the gain of the receiver stage including a means with the microprocessor of supplying a plurality of paralleled output digital signals indicative of the required gain, means for converting the digital signal output to an analog gain control signal, and circuit means for applying the voltage gain control signal to the sonar receiver.

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First Claim