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, 324 83Q, 324 79R, 324 79D, 324 77B, 364484, G01R 2300
Patent
active
050992430
ABSTRACT:
This is a technique for extending the frequency range which employs in-phase and quadrature components of the signal coupled with non-uniform sampling to gain the advantages of a high sampling rate with only a small increase in the number of samples. By shifting the phase of the local oscillator by 90 degrees, a quadrature IF signal can be generated. Both in-phase and quadrature components are sampled and the samples are combined to form a complex signal. When this signal is transformed, only one alias is obtained per periodic repetition and the effective Nyquist frequency is doubled. Two sets of complex samples are then used with the slightly different sampling frequency. Each set is independently Fourier transformed and the frequency of the lowest aliases permits unambiguous determination of the signal frequency over a range far exceeding the Nyquist frequency.
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patent: 4633516 (1986-12-01), Tsui
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Sanderson Richard B.
Tsui James B. Y.
Franz Bernard E.
Singer Donald J.
Solis Jose M.
The United States of America as represented by the Secretary of
Wieder Kenneth A.
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