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Sine saturation transform

  • US 7,904,132 B2
  • Filed: 12/16/2008
  • Issued: 03/08/2011
  • Est. Priority Date: 06/29/2001
  • Status: Active Grant
First Claim
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1. In a patient monitor configured to obtain signals responsive to physiological parameters of a monitored patient, a method for filtering one or more of said signals to improve a determination of a pulse rate of the monitored patient, the method comprising:

  • receiving one or more signals indicative of light attenuated by body tissue of pulsing blood in said monitored patient, said one or more signals usable to determine physiological measurements and a pulse rate of said monitored patient;

    electronically determining an initial frequency estimate of said pulse rate;

    electronically combining at least one sinusoidal waveform responsive to said estimate of said pulse rate with said one or more of said signals to produce a predetermined signal response; and

    electronically signal component processing the combined signal to determine an output measurement of said pulse rate.

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