Apparatus for detecting the frequency of an input signal by coun

Details Apparatus for detecting the frequency of an input signal by coun Apparatus for detecting the frequency of an input signal by coun

1993-09-24

1995-08-15

Wieder, Kenneth A.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 7648, 377 39, G01R 2302

Patent

active

054422787

ABSTRACT:
An apparatus for detecting frequency of an input signal by counting the pulses of a reference signal of a predetermined frequency within one cycle of the input signal is disclosed. The apparatus includes a first and a second latch for latching the number of pulses of the reference signal for two consecutive periods of the input signal. In response to the reference signal, a comparator is used to compare the output value of the first and the second latch. When they are different, a flip-flop generates an interrupt signal to a microprocessor. The microprocessor reads the updated number of pulses and generates an updated frequency value based on the updated number of pulses and the predetermined frequency of the reference signal.

REFERENCES:
patent: 4150432 (1979-04-01), Sorden
patent: 4326256 (1982-04-01), Furumoto
patent: 4471299 (1984-09-01), Elmis
patent: 4707653 (1987-11-01), Wagner
patent: 4984254 (1991-01-01), Thomas
patent: 5089770 (1992-02-01), Lee et al.

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