Variable Focusing Sonar.
Patent, filed 22 Oct 68, patented 3 Jul 90,
DEPARTMENT OF THE NAVY WASHINGTON DC
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The received signal from an acoustic echo detection and ranging system is compared with internally generated signals indicating the focus of a variable focus transducer. Logic circuits in the signal comparison channel develop control voltages to focus said transducer upon a predetermined area from which said received signal originates. Patents. jhd
- Acoustic Detection and Detectors