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Method for improving accuracy of pulse rate estimation

  • US 9,814,400 B1
  • Filed: 05/26/2015
  • Issued: 11/14/2017
  • Est. Priority Date: 05/26/2015
  • Status: Active Grant
First Claim
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1. A method comprising:

  • receiving, from a sensor, a plurality of samples of a signal, wherein the signal is related to a cardiovascular pulse;

    determining a predicted pulse rate based at least on a first set of the plurality of samples;

    determining a frequency spectrum of a second set of the plurality of samples, wherein the frequency spectrum comprises a plurality of frequency components, each having a respective magnitude;

    determining a frequency of a local maximum of the frequency spectrum;

    determining an overall energy in the frequency spectrum;

    determining a confidence level of the determined frequency of the local maximum, wherein the determined confidence level is based on at least a magnitude of the local maximum of the frequency spectrum and the determined overall energy in the frequency spectrum; and

    determining a pulse rate based on the predicted pulse rate, the determined frequency of the local maximum, and the determined confidence level.

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