Frequency Adaptive Line Voltage Filters
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United States of America Patent
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Issued Date -
Sep 18, 2014
app pub date -
Mar 15, 2013
filing date -
Mar 15, 2013
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Abstract
A method for reducing noise from an electrical signal includes: obtaining a sampling rate for the electrical signal. The sampling rate is a rate at which voltage readings are obtained for the electrical signal. Each voltage reading comprises a data component and a noise component. A time interval is determined from the sampling rate. A number of voltage readings are obtained. Each voltage reading is obtained one time interval of time after a previous voltage reading is obtained. At each time interval: a voltage reading is obtained; the obtained voltage reading is applied to a low-pass filter; a noise value is obtained from the low-pass filter; and the noise value is subtracted from the voltage reading.
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