Active noise cancellation in an optical sensor signal
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United States of America Patent
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Jan 8, 2013
Grant Date -
Dec 16, 2010
app pub date -
Jun 10, 2010
filing date -
Jun 10, 2009
priority date (Note) -
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Abstract
A medical device system and associated method are used for monitoring tissue oxygenation. An optical sensor produces a signal corresponding to tissue light attenuation. A processor receives the optical sensor signal and computes a first measure of light attenuation at a first light wavelength and a second measure of light attenuation at a second light wavelength. In one embodiment, noise cancellation circuitry receives the first measure and the second measure and generates a guessed ratio of the first and second measures. Using the first measure, the second measure and the guessed ratio, the noise cancellation circuitry provides a peak output power when the guessed ratio corresponds to an actual ratio of the first and second measures.
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