Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1989-08-17
1991-01-08
Tokar, Michael J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 77R, 364484, G01R 2314
Patent
active
049839063
ABSTRACT:
A signal of interest is periodically sampled and the samples decomposed into quadrature components. The signal's phase angle at each sample is computed from the ratio of the real to imaginary parts. A linear regression analysis is then performed on the sampled phase data to obtain a best estimate of the signal's phase rate of change. From this estimate, the signal frequency is determined. In superheterodye instruments, the frequency of an input signal can be deduced by analyzing an intermediate frequency signal using this technique and factoring out the frequency of intervening local oscillator(s).
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Hewlett--Packard Company
Tokar Michael J.
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