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Active noise cancellation in an optical sensor signal

  • US 8,352,008 B2
  • Filed: 06/10/2010
  • Issued: 01/08/2013
  • Est. Priority Date: 06/10/2009
  • Status: Active Grant
First Claim
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1. A medical device system, comprising:

  • an optical sensor for producing a signal corresponding to tissue light attenuation;

    a processor receiving the optical sensor signal and configured to compute a first measure of light attenuation at a first light wavelength and a second measure of light attenuation at a second light wavelength; and

    noise cancellation circuitry for receiving the first measure and the second measure and generating an estimated ratio of the first and second measures, the noise cancellation circuitry providing a peak output power when the guessed ratio corresponds to an actual ratio containing the first measure;

    the processor determining a tissue oxygenation using the estimated ratio corresponding to the peak output power of the noise cancellation circuitry.

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