Accession Number : ADD015091

Title :   Digital Calibration Circuit Employing Composite Sine Wave Signals.

Descriptive Note : Patent, Filed 30 Aug 90, patented 1 Oct 91,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Blackmon, Fletcher A ; Reid, Robert J

Report Date : 01 Oct 1991

Pagination or Media Count : 7

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)

Descriptors :   ANALOG SYSTEMS, CALIBRATION, CIRCUITS, CLEARANCES, CLOCKS, COUNTING METHODS, DATA BASES, DATA STORAGE SYSTEMS, DIGITAL SYSTEMS, HYDROPHONES, INFORMATION TRANSFER, OUTPUT, REPRODUCIBILITY, SIGNAL PROCESSING, SIGNALS, SINE WAVES

Subject Categories : Test Facilities, Equipment and Methods
      Acoustic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE