Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1991-03-06
1992-03-24
Wieder, Kenneth A.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
342 14, 342 16, 342 18, 342 20, 364484, 324 79D, 324 83D, 324 77B, 324 77D, G01R 2300
Patent
active
050991949
ABSTRACT:
This proposed approach to extending the frequency range uses non-uniform sampling to gain the advantages of a high sampling rate with only a modest increase in the number of samples. The basic idea is to use two sets of uniform samples with slightly different sampling frequency. Each set of samples is Fourier transformed independently and the frequency of the lowest aliases determined. It is shown that knowledge of these two alias frequencies permits unambiguous determination of the signal frequency over a range far exceeding the Nyquist frequency, except at a discrete set of points. It is further shown that one additional set of samples is sufficient to resolve all these discrete degeneracies.
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patent: 4336541 (1982-06-01), Tsui et al.
patent: 4504785 (1985-03-01), Tucker et al.
patent: 4633516 (1986-12-01), Tsui
patent: 4893266 (1990-01-01), Deem
patent: 4979215 (1990-12-01), Fontanes
Sanderson Richard B.
Tsui James B. Y.
Franz Bernard E.
Singer Donald D.
Solis Jose M.
The United States of America as represented by the Secretary of
Wieder Kenneth A.
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