Frequency measurement system

Details Frequency measurement system Frequency measurement system

1984-08-06

1986-09-02

Wise, Edward J.

Boots, shoes, and leggings

324 78R, 324 78D, 324 78E, 324 76A, G01R 2302

Patent

active

046099905

ABSTRACT:
A method of developing a signal representative of the instantaneous frequency of an alternating current signal encompasses first determining the apparent frequency of the signal at the ends of sampling periods (e.g., half cycles). From successively derived apparent frequencies the rate of change in frequency is calculated. The actual frequency signal is then generated as a function of the apparent frequency and the rate of change. In a specific implementation, the method is employed to develop a signal representative of the rotational speed of a motor.

REFERENCES:
patent: 3553728 (1971-01-01), Frank et al.
patent: 3590277 (1971-06-01), South
patent: 4050747 (1977-09-01), Ruhnau et al.
patent: 4112358 (1978-09-01), Ashida
patent: 4310795 (1982-01-01), Fremereg
patent: 4363099 (1982-12-01), Srinivasan et al.
patent: 4454470 (1984-06-01), Boettner et al.

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