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System and method for the algebraic derivation of physiological signals

  • US 5,687,722 A
  • Filed: 07/26/1995
  • Issued: 11/18/1997
  • Est. Priority Date: 05/17/1995
  • Status: Expired due to Term
First Claim
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1. A system for the enhancement of physiological signals for the measurement of blood oxygen in a subject, the system comprising:

  • first and second light sources to direct light toward the subject, said first and second light sources producing light of first and second wavelengths, respectively;

    a light detector positioned to detect first and second light signals after interacting with the subject and to generate first and second signals indicative of an intensity of said first and second detected light signals, respectively, said first generated signal having a first portion arising from light transmitted from said first source and a second portion arising from a first interference light source, said second generated signal having a first portion arising from light transmitted from said second source and a second portion arising from a second interference light source;

    a window generator to generate first and second data windows derived from data comprising said first and second generated signals;

    a storage location containing a mathematical relationship of said first and second portions of said first and second generated signals and a ratio of said first portion of said first generated signal to said first portion of said second generated signal; and

    a calculator using said mathematical relationship to generate first and second functions using said first and second data windows, respectively, said first and second functions having a point of intersection indicative of said ratio.

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