Apparatus for detecting signal frequency and controlling indicat

Details Apparatus for detecting signal frequency and controlling indicat Apparatus for detecting signal frequency and controlling indicat

1993-10-05

1996-01-09

Wieder, Kenneth A.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

327 37, 327 31, 327131, H03K 906

Patent

active

054831547

ABSTRACT:
An apparatus and a method for discriminating the frequency of an input signal and for providing a binary output signal. The binary output signal can be used to control an indicating device and/or other circuitry. A sawtooth wave is started at zero crossings. An integral of the sawtooth wave is then compared with a threshold reference. The output signal indicates if the input signal frequency is above or below a threshold frequency.

REFERENCES:
patent: 3349256 (1967-10-01), Rohner
patent: 3594588 (1971-07-01), Evans
patent: 3610957 (1971-10-01), Hiscox
patent: 3653018 (1972-03-01), Budryz
patent: 4322642 (1982-03-01), Sugasawa
patent: 4603357 (1986-07-01), Ramirez

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