Signal processing apparatus

  • US 6,745,060 B2
  • Filed: 12/03/2001
  • Issued: 06/01/2004
  • Est. Priority Date: 03/07/1991
  • Status: Expired due to Fees
First Claim
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1. A method of calculating oxygen saturation from intensity signals resulting from light of first and second wavelengths attenuated by body tissue carrying pulsing blood, comprising:

  • sampling the intensity signals over a first time period;

    performing a Fourier transform on the sampled intensity signals; and

    calculating oxygen saturation by including at least a plurality of magnitudes for each of the Fourier transformed intensity signals for non-zero frequencies in the calculation for the first time period.

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