Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1974-05-30
1976-07-06
Rolinec, R. V.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
128 206F, 324 78J, 324 99D, 324186, G01R 2302
Patent
active
039684318
ABSTRACT:
Method and apparatus for measuring the repetition rate of a series of electrical input pulses. An electrical quantity having a predetermined initial value changes at a predetermined rate in response to the presence of an input pulse; a later value of the quantity is detected in response to the presence of the next input pulse; and, in response to the later value of the quantity, an electrical output signal is provided that is indicative of the repetition rate of the input pulses. Typically the steps are repeated for a plurality of successive input pulses and a control signal maintains the detected later values of the quantity substantially equal to a predetermined comparison value. An alarm may be provided in response to any substantial change in the repetition rate of the input pulses.
REFERENCES:
patent: 2919401 (1959-12-01), Cole
patent: 3370230 (1968-02-01), Mirat et al.
patent: 3436756 (1969-04-01), Myers et al.
patent: 3548807 (1970-12-01), Crovella
patent: 3586835 (1971-06-01), Foeh
patent: 3675643 (1972-07-01), Funfstack
patent: 3729676 (1973-04-01), Currie
patent: 3781677 (1973-12-01), Hagen
patent: 3857398 (1974-12-01), Rubin
Caldwell et al., A Wide Range Linear Beat by Beat Cardiotachometer, Med. & Biol. Engng, 1970, vol. 8, pp. 181-185.
Board of Regents University of Washington
Rolinec R. V.
Tokar Michael J.
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