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ON-DEMAND HEART RATE ESTIMATION BASED ON OPTICAL MEASUREMENTS

  • US 20180000424A1
  • Filed: 06/30/2016
  • Published: 01/04/2018
  • Est. Priority Date: 06/30/2016
  • Status: Active Grant
First Claim
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1. A computer-implemented method for determining a heart rate from a heartbeat signal present in a first signal generated by a heartbeat sensor, the method comprising:

  • computing an autocorrelation of data samples of the first signal over a first time period;

    processing a second signal to evaluate motion of the heartbeat sensor during the first time period, the second signal indicative of a motion of the heartbeat sensor with respect to one or more directions;

    determining whether the data samples of the first signal over the first time period pass a first set of confidence checks, the first set of confidence checks comprising at leastdetermining whether the motion of the heartbeat sensor during the first time period satisfies a motion-related criteria;

    upon determination that the data samples of the first signal over the first time period pass the first set of confidence checks, computing a first estimate of the heart rate from the autocorrelation of the data samples of the first signal over the first time period;

    computing a Discrete Fourier Transform (DFT) for data samples of the first signal over a second time period;

    computing a second estimate of the heart rate from the DFT; and

    determining the heart rate based on the first estimate and the second estimate.

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