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Signal processing apparatus

DC
  • US 5,632,272 A
  • Filed: 10/07/1994
  • Issued: 05/27/1997
  • Est. Priority Date: 03/07/1991
  • Status: Expired due to Term
First Claim
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1. In a signal processor for processing at least two measured signals S1 and S2 each containing a primary signal portion s and a secondary signal portion n, said signals S1 and S2 being in accordance with the following relationship:

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    space="preserve" listing-type="equation">S.sub.1 =s.sub.1 +n.sub.1
    
    
    space="preserve" listing-type="equation">S.sub.2 =s.sub.2 +n.sub.2where s1 and s2, and n1 and n2 are related by;

    s1 =ra s2 and n1 =rv n2and where ra and rv are coefficients,a method comprising the steps of;

    determining a value for the coefficient ra which minimizes correlation between s1 and n1 ;

    calculating the blood oxygen saturation from said value of ra ; and

    displaying the blood oxygen saturation on a display.

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