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Signal processing apparatus

  • US 7,937,130 B2
  • Filed: 12/19/2008
  • Issued: 05/03/2011
  • Est. Priority Date: 03/07/1991
  • Status: Expired due to Fees
First Claim
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1. A method determining a value of blood oxygen saturation of pulsing blood, the method comprising:

  • receiving three or more intensity signals from at least one light-sensitive detector which detects light attenuated by body tissue carrying pulsing blood, wherein the three or more intensity signals correspond to detection of at least three wavelengths of the light and the three or more intensity signals include motion induced noise; and

    determining a value of oxygen saturation using the three or more intensity signals, wherein the determination reduces an effect of motion induced noise on said value.

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