Digital Calibration Circuit Employing Composite Sine Wave Signals.
Patent, Filed 30 Aug 90, patented 1 Oct 91,
DEPARTMENT OF THE NAVY WASHINGTON DC
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A digital calibration circuit provides 13 octave center frequencies substantially in the range of 50 Hz-12.5 kHz 25 tones simultaneously at the output at repeatable levels. The system converts digital data to an analog representation for use in calibrating hydrophones. The calibration circuit is comprised of a clock section, a counting section, a clearing section, a data storage-transfer section, and a signal conditioning section. The information that is provided to the output in analog form is stored in digital form in an EPROM within the data storagetransfer section. Author
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