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 Optics and Acoustics Acoustic Detection and Detectors |
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Digital Calibration Circuit Employing Composite Sine Wave Signals.
Authors: Fletcher A. Blackmon; Robert J. Reid; DEPARTMENT OF THE NAVY WASHINGTON DC |
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Abstract: A digital calibration circuit provides 1/3 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 storage/transfer section. (Author)
| Description: |
Patent, Filed 30 Aug 90, patented 1 Oct 91 |
| Pages: |
7 |
| Report Date: |
01 OCT 1991 |
| Report Number: |
D190510 |
Report Unavailable |
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