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Signal processing apparatus and method

  • US 6,036,642 A
  • Filed: 06/22/1998
  • Issued: 03/14/2000
  • Est. Priority Date: 03/07/1991
  • Status: Expired
First Claim
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1. A method of determining an indication of blood oxygen saturation comprising the steps of:

  • transmitting light of at least first and second wavelengths through body tissue carrying blood to a light-sensitive detector to generate first and second measured intensity signals;

    filtering at least one of said first and second intensity signals with an adaptive canceler to provide at least one output signal; and

    calculating oxygen saturation based upon said at least one output signal.

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