Signal processing apparatus

  • US 6,263,222 B1
  • Filed: 10/06/1997
  • Issued: 07/17/2001
  • Est. Priority Date: 03/07/1991
  • Status: Expired due to Fees
First Claim
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1. A physiological monitoring method comprising the steps of:

  • receiving at least two measured intensity signals generated by the detection of at least two wavelengths of light transmitted through body tissue, each of said at least two intensity signals having a first portion dependent on attenuation of said light due to arterial blood and a second portion dependent on attenuation of said light due to motion induced variation in the body tissue; and

    determining arterial oxygen saturation during motion by filtering at least one of said intensity signals wit a Kalman filter to generate an approximation of arterial oxygen saturation during motion, and selecting a resulting arterial oxygen saturation based upon knowledge about oxygen saturation in body tissue and upon the approximation of arterial oxygen saturation.

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