Frequency detection system

Details Frequency detection system Frequency detection system

1982-01-26

1984-03-13

Tokar, Michael J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 77A, G01R 2302

Patent

active

044370571

ABSTRACT:
The disclosed frequency detection system samples a sinusoidal input V(t) with a predetermined constant sampling period h to form four sampled values V(t.sub.o -2h), V(t.sub.o -h), V(t.sub.o +th) and V(t.sub.o +2h) and calculates ##EQU1## where .omega. designates an angular frequency of the sinusoidal input after the conversion to corresponding digital values to provide a measure of its frequency. Further the absolute value of the frequency may be obtained by making an arc-cosine of one half the y(h).

REFERENCES:
patent: 2280524 (1942-04-01), Hansen
patent: 2995727 (1961-08-01), Quade
patent: 3454876 (1969-07-01), Huang
Masamitsu Kawakami, "Electronic Circuits IV", pp. 166-167, Jul. 1966, Kyoritsu-Sha.
Data Sheet for Frequency Relay Type FCX 103, published by Brown Boveri and Company Ltd., publication date unknown.

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