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Apparatus and method for measuring pulse rate

  • US 7,438,688 B2
  • Filed: 08/28/2006
  • Issued: 10/21/2008
  • Est. Priority Date: 08/26/2005
  • Status: Active Grant
First Claim
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1. An apparatus, adapted to measure a pulse rate of a subject, comprising:

  • a plurality of band pass filters, each of which has a center frequency that is different from the others, the band pass filters being connected in parallel to one another so as to be adapted to receive a first signal corresponding to a pulse wave of the subject and be operable to output a plurality of second signals each of which is obtained by filtering the first signal with each center frequency;

    a first processor, operable to obtain a fundamental frequency of the first signal;

    a selector, operable to select one of the second signals which is output from one of the band pass filters having such a center frequency that is closest to the fundamental frequency; and

    a second processor, operable to calculate the pulse rate from the selected one of the second signals.

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