System for prefiltering a plethysmographic signal
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United States of America Patent
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Jul 22, 2008
Grant Date -
Dec 28, 2006
app pub date -
Oct 14, 2005
filing date -
Jun 28, 2005
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Abstract
A detector signal in a pulse oximeter is prefiltered, prior to processing so as to determine a physiological parameter value, so as to reduce the effects of artifact in the signal. An exemplary prefilter multiplies signal amplitude values by a quantitude that is inversely proportional to a substantially current amplitude so as to reduce the amplitude of large amplitude sections typically associated with artifact. In one implementation, the quantity is a ratio of an amplitude associated with a clean section of the signal by some exponential factor of a substantially current amplitude. In this manner, artifact affected portions of the signal are deemphasized in subsequent analyses.
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