Method and apparatus for removing noise spikes
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United States of America Patent
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Jan 13, 2004
Grant Date -
Apr 3, 2003
app pub date -
Jun 28, 2002
filing date -
Jun 28, 2001
priority date (Note) -
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Abstract
The invention provides a method for removing noise spikes from an electrical input signal having an AC component, comprising the steps of determining the actual rms value of the input signal, low pass filtering the input signal, producing a variable offset, said variable offset being a function of the actual rms value, forming a variable threshold by superimposing the variable offset to the low pass filtered signal, comparing the input signal to the variable threshold, creating a spike detection signal when the input signal passes the variable threshold, and blanking the input signal during the occurrence of the spike detection signal.
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