Digital power metering system for reducing spectral leakage...

Details Digital power metering system for reducing spectral leakage... Digital power metering system for reducing spectral leakage...

2005-04-15

2008-10-28

Barlow, Jr., John E. (Department: 2863)

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Electrical signal parameter measurement system

C702S060000, C702S076000, C702S077000

Reexamination Certificate

active

07444249

ABSTRACT:
A digital power metering system reduces spectral leakage when determining the frequencies present in a power signal by a technique that includes sampling the signal and performing a transformation from the time domain to the frequency domain. The system initially measures the fundamental frequency of the power signal, and samples the power signal at a known sampling rate to produce digital sample values representing the power signal. The system then determines whether the known sampling rate is within a preselected range of a rate that is coherent with the measured fundamental frequency. If the answer is negative, then the system resamples the signal at a rate that is coherent with the measured fundamental frequency to produce resample values representing the signal, so that the frequencies present in the power signal can be determined from the resample values.

REFERENCES:
patent: 6016112 (2000-01-01), Knudsen
patent: 6185508 (2001-02-01), Van Doorn et al.
patent: 6687630 (2004-02-01), Dionne
patent: 2003/0014203 (2003-01-01), Dionne
patent: 2004/0260471 (2004-12-01), McDermott
patent: 2005/0038942 (2005-02-01), Swanson

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