AC induction noise canceler
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United States of America Patent
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Oct 27, 2015
Grant Date -
Jul 24, 2014
app pub date -
Jan 24, 2013
filing date -
Jan 24, 2013
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Abstract
A method for removing noise from an electrical signal in an alarm system using a software filter, the method including the steps of converting the electrical signal from an analog signal into a digital signal, wherein the digital signal includes a series of sampled values, entering a most recent of the sampled values into a circular index containing a number of previously sampled values, multiplying each of the values in the circular index by a predetermined filter coefficient, and summing products of each of the multiplied circular index values and filter coefficients to arrive at a filtered digital signal value.
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