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Signal processing apparatus and method

  • US 9,289,167 B2
  • Filed: 12/05/2012
  • Issued: 03/22/2016
  • Est. Priority Date: 04/14/1997
  • Status: Expired due to Fees
First Claim
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1. A pulse oximetry system for the determination of a physiological parameter wherein said pulse oximetry system is configured to remove motion artifacts from physiological signals, comprising:

  • an optical sensor for providing said pulse oximetry system with photo-plethysmographic data, wherein said sensor comprises a light emitting diode for emitting light and a photo-detector for detecting said light, wherein said detected light contains information on the photo-plethysmographic data; and

    a processor for processing the photo-plethysmographic data, wherein said processor is configured to;

    (a) acquire said photo-plethysmographic data;

    (b) transform the photo-plethysmographic data into frequency domain data;

    (c) analyze the frequency domain data to determine a result;

    (d) determine a time domain data photo-plethysmographic signal using said result of said analysis of said frequency domain data;

    (e) analyze a mathematical transformation of the time domain photo-plethysmographic signal to identify parameters;

    (f) use said parameters to determine whether an artifact is present and to identify a physiological signal; and

    (g) determine a physiological parameter from said physiological signal.

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