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METHODS AND SYSTEMS FOR DETERMINING PHYSIOLOGICAL INFORMATION USING AUTOCORRELATION AND AN ENVELOPE TECHNIQUE

  • US 20140073877A1
  • Filed: 09/11/2012
  • Published: 03/13/2014
  • Est. Priority Date: 09/11/2012
  • Status: Abandoned Application
First Claim
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1. A subject monitoring system for determining physiological information of a subject, comprising:

  • a sensor configured to generate an intensity signal, wherein the sensor detects light attenuated by the subject; and

    processing equipment coupled to the sensor, wherein the processing equipment is configured to;

    generate an envelope based on a segment of an optical intensity signal derived from the intensity signal;

    modify the optical intensity signal based on the envelope;

    calculate an autocorrelation sequence based on the modified optical intensity signal; and

    determine a value indicative of a physiological rate of the subject based on the autocorrelation sequence.

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