Programmable frequency detector

Details Programmable frequency detector Programmable frequency detector

1975-03-31

1976-11-02

Rolinec, R. V.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 78D, 328141, G01R 2302

Patent

active

039900070

ABSTRACT:
A programmable frequency detector is provided for determining if the frequency of an input signal is above, below, or within a programmable tolerance of a programmable frequency. A counter circuit is provided that is enabled by a timing stage during a predetermined calculation period to count the input frequency; the counter output is then compared to a programmed frequency code input by a comparator stage. A latch circuit and the timing circuits then utilize the comparator output to determine if the input frequency was high, low, or within the pass tolerance band.

REFERENCES:
patent: 3735387 (1973-05-01), Miller
patent: 3760269 (1973-09-01), Beeman
Seith, "Frequency Deviation Indicator", IBM, Tech. Disclosure Bulletin, vol. 4, No. 11, Apr. 1962, pp. 38, 39.

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