Electrical pulse counters – pulse dividers – or shift registers: c – Systems – Converting input or output signal from or to an analogue signal
Patent
1990-08-30
1991-10-01
Heyman, John S.
Electrical pulse counters, pulse dividers, or shift registers: c
Systems
Converting input or output signal from or to an analogue signal
328 14, 364718, G06F 102
Patent
active
050540394
ABSTRACT:
A digital calibration circuit provides 1/3 octave center frequencies substially 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.
REFERENCES:
patent: 4225936 (1980-09-01), Lesche
patent: 4295098 (1981-10-01), Crowley
patent: 4484296 (1984-11-01), Treise et al.
patent: 4556869 (1985-12-01), Thomson
patent: 4695804 (1987-09-01), Bardl et al.
patent: 4710891 (1987-12-01), Debus et al.
patent: 4943779 (1990-07-01), Pedersen et al.
Blackmon Fletcher A.
Reid Robert J.
Heyman John S.
Lall Prithvi C.
McGowan Michael J.
Oglo Michael F.
The United States of America as represented by the Secretary of
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