Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Phase comparison
Patent
1976-04-28
1978-01-31
Tokar, M.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Phase comparison
324 83Q, 324 83D, 328140, 364728, G01R 2500
Patent
active
040718212
ABSTRACT:
Digital apparatus and a method are disclosed for determining the phase angle of a tone signal of known frequency by correlating a clipped version of the tone signal with a reference signal having a repetition rate equal to the tone frequency. Correlation is accomplished by multiplying the clipped tone signal with each of quadrature components of the reference signal and sampling the product signals to provide binary sample trains which are supplied to a pair of shift register accumulators which effectively frame a moving phase measurement window. Reversible counters and associated logic determine the magnitudes and signs of differences in numbers of samples of noncorresponding binary values in each of the accumulators, and provide counts representative of in-phase and quadrature components of the product of the tone signal and the reference signal. The counts are utilized in a digital processor to compute the phase angle of the tone signal relative to the reference signal.
REFERENCES:
patent: 3464016 (1969-08-01), Kerwin et al.
patent: 3553579 (1971-01-01), Teixeira
patent: 3633117 (1972-01-01), Reilly
patent: 3641445 (1972-02-01), Green
patent: 3740655 (1973-06-01), Dickey
patent: 3745559 (1973-07-01), Mattern
Harthill William P.
Roberts James L.
Honeywell Inc.
Rubow Charles L.
Tokar M.
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