Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Analysis of complex waves
Patent
1983-07-19
1986-01-07
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Analysis of complex waves
307351, 324103P, 328151, 375118, G01R 2316
Patent
active
045636370
ABSTRACT:
In order to measure the amplitude of a periodic signal of known frequency which may be heavily contaminated by noise and whose phase is not known at the point of measurement, e.g. at an output end of an optical fiber, two samples are periodically taken in every cycle at instants spaced apart by a quarter-cycle. The two samples are accumulated over N cycles and the signs of the resulting algebraic sums are compared at every N.sup.th cycle to determine whether the sampling phases should be advanced or retarded within a cycle by a predetermined increment .DELTA. in order to let the first and the second sample of a pair respectively approach the peak and the zero crossing of a half-cycle of the signal wave at which point, with the noise more or less balanced out, the second sum is substantially zero while the first sum represents N times the actual signal amplitude.
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De Bortoli Marco
Tofanelli Adler
Varetto Luigi
Cselt Centro Studi e Laboratori Telecomunicazioni S.p.A.
Dubno Herbert
Karlsen Ernest F.
O'Shea Kevin D.
Ross Karl F.
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