Time variant frequency correction technique

Details Time variant frequency correction technique Time variant frequency correction technique

1987-02-06

1989-01-17

Levy, Stewart J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 78R, G01R 2314

Patent

active

047990201

ABSTRACT:
A time variant frequency correction technique uses a frequency conversion circuit to obtain an intermediate frequency and an adjusted local oscillator frequency from an input signal frequency, a local oscillator frequency and a reference oscillator frequency. The intermediate frequency and adjusted local oscillator frequency are simultaneously counted during a period determined by the reference frequency. The resulting counts are used to calculate the input frequency independent of time variations in the local oscillator frequency for display on a display device.

REFERENCES:
patent: 3913013 (1975-10-01), Barley et al.
patent: 3938048 (1976-02-01), Elliott
patent: 4137497 (1979-01-01), Lowenschuss

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