Filtering techniques to remove noise from a periodic signal and IRMS calculations

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United States of America Patent

PATENT NO 9116185
APP PUB NO 20120095704A1
SERIAL NO

13280787

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Signal filtering removes effects of a periodic, low-frequency noise signal from a signal of interest. A signal waveform is sampled at different points of a number of consecutive periodic noise signal cycles and the collected samples are averaged to produce a corrected signal. The number of consecutive cycles in which samples are taken and averaged is inversely related to the signal amplitude such that as the signal level decreases, the number of cycles examined increases. Improved RMS calculations are obtained for filtering low-frequency random noise from Hall sensors by averaging samples at different points of a signal cycle to create a composite desired signal cycle to facilitate other signal calculations.

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Patent Owner(s)

  • ITRON, INC.

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Gervais, Michel Bajamont, FR 15 213
Moore, Michael E Central, US 17 351
Snyder, Isabelle B Walhalla, US 4 39

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