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Method and device for pulse rate detection

  • US 7,018,338 B2
  • Filed: 09/26/2002
  • Issued: 03/28/2006
  • Est. Priority Date: 09/28/2001
  • Status: Expired due to Term
First Claim
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1. Portable pulse rate detecting device for contact with human body tissue, comprising:

  • a light-emitting source for emitting radiant energy through human body tissue;

    at least first and second light detectors for detecting intensity of radiant energy after propagation through human body tissue and for providing first and second input signals (y1(t), y2(t)) as a function of such detected radiant energy;

    a device for measuring motion of the detecting device with respect to human body tissue and for providing a motion reference signal (ax(t), ay(t), az(t)) as a function of said motion;

    processing means for removing, from said first and second input signals (y1(t), y2(t)), motion-related contributions due to movement of the detecting device with respect to human body tissue and producing first and second enhanced signals,said processing means being arranged to calculate a model of said motion-related contributions based on said motion reference signal (ax(t), ay(t), az(t)) and to subtract this model from each of said first and second input signals (y1(t), y2(t)),wherein said processing means is also for removing measurement noise and residual non-modelled contributions from said first and second enhanced signals using a noise reduction algorithm; and

    means for detecting non-stationary signal segments in said motion reference signal (ax(t), ay(t), az(t)) and for disabling at least one of said light-emitting source, said light detectors and said processing means when non-stationary signal segments are detected.

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