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Pulse oximeter with separate ensemble averaging for oxygen saturation and heart rate

  • US 7,209,774 B2
  • Filed: 04/27/2006
  • Issued: 04/24/2007
  • Est. Priority Date: 03/08/2004
  • Status: Active Grant
First Claim
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1. A method for processing signals in a pulse oximeter to determine oxygen saturation and pulse rate, comprising:

  • receiving waveforms corresponding to two different wavelengths of light from a patient;

    low pass filtering the waveforms in a first low pass filter;

    calculating a pulse rate based on an output of the first low pass filter;

    normalizing the waveforms to produce normalized waveforms;

    low pass filtering the normalized waveforms in a second low pass filter; and

    calculating an oxygen saturation based on an output of the second low pass filter.

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