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Signal processing apparatus

DC
  • US 6,650,917 B2
  • Filed: 12/04/2001
  • Issued: 11/18/2003
  • Est. Priority Date: 03/07/1991
  • Status: Expired due to Fees
First Claim
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1. In a signal processor that receives at least first and second intensity signals resulting from light of first and second wavelengths attenuated by body tissue carrying pulsing blood, each intensity signal containing a primary signal portion and a noise portion, said first and second signals substantially adhering to a predefined signal model, a method comprising:

  • sampling said first and second intensity signals over a period of time;

    performing a Fourier transform on the intensity signals; and

    calculating at least two oxygen saturation values from at least a plurality of magnitudes of the Fourier transformed intensity signals for non-zero frequencies; and

    determining oxygen saturation from at least one of said at least two values consistent with the predefined signal model.

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