Electricity: measuring and testing – Plural – automatically sequential tests
Patent
1995-08-07
1997-12-02
Karlsen, Ernest F.
Electricity: measuring and testing
Plural, automatically sequential tests
3241581, G01R 130
Patent
active
056940360
ABSTRACT:
A direction sensor is provided in an automatic control circuit which is incorporated into a distortion reduction circuit. The direction sensor is comprised of a test switch, first and second storage devices, a comparison device, a normalization device and a sampling control device. The direction sensor conducts a series of consecutive test cycles, comprised of even numbered test cycles and odd numbered test cycles, and during each test cycle a sample of the test signal is taken. During the even numbered test cycles the sampling control device causes the test switch to transfer an even numbered sample of the test signal to the first storage device and thereafter to the first input of the comparison device, where the even numbered sample is compared with an earlier in time odd numbered sample at the second input of the comparison device. The comparison device produces a first comparison signal indicative of the relative value of the samples. During odd numbered test cycles, the sampling control device is adapted to cause the test switch to transfer an odd numbered sample of the test signal to the second storage device and thereafter to the second input of the comparison device, where the odd numbered sample is compared with an earlier in time even numbered sample at the first input of the comparison device. The comparison device produces a second comparison signal indicative of the relative value of the samples. A normalization signal from the sampling control device and the comparison signal from the comparison device are combined to produce a direction signal.
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Karlsen Ernest F.
Lucent Technologies - Inc.
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