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Condensed oximeter system with noise reduction software

  • US 5,351,685 A
  • Filed: 08/05/1991
  • Issued: 10/04/1994
  • Est. Priority Date: 08/05/1991
  • Status: Expired due to Term
First Claim
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1. A method for determining a parameter of blood, comprising the steps of:

  • emitting first and second wavelengths of light through a sample;

    detecting said first and second wavelengths of light through said sample;

    producing first and second analog signals responsive to said detection of said first and second wavelengths, respectively, said first and second analog signals being proportional to the intensity of said first and second wavelengths of light, respectively, said first analog signal having an AC and DC component and said second analog signal having an AC and a DC component;

    separating said AC component of said first analog signal from said first analog signal to produce a first separated AC component and separating said AC component of said second analog signal from said second analog signal to produce a second separated AC component;

    converting said first and second separated AC components into a first digital signal and a second digital signal, respectively;

    computing the derivatives of said first and second separated AC components;

    taking a linear regression of the ratio of said derivatives of said first and second separated AC components for a plurality of sample points in a period; and

    computing said parameter of blood, said parameter of blood being dependent on the derivatives of said first and second separated AC components.

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