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Signal processing apparatus

DC
  • US 7,215,986 B2
  • Filed: 06/15/2005
  • Issued: 05/08/2007
  • Est. Priority Date: 03/07/1991
  • Status: Expired due to Fees
First Claim
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1. A method of determining blood oxygen saturation comprising:

  • sensing physiological signals resulting from the attenuation of light of at least first and second wavelengths by body tissue carrying pulsing blood;

    determining at least two values corresponding to oxygen saturation based upon at least two alternative methods of using the physiological signals; and

    determining a resulting value for oxygen saturation from the at least two values corresponding to oxygen saturation, wherein one of the at least two alternative methods comprises at least one calculation in the frequency domain.

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