Signal processing apparatus and method

  • US 7,489,958 B2
  • Filed: 05/03/2006
  • Issued: 02/10/2009
  • Est. Priority Date: 04/14/1997
  • Status: Expired due to Fees
First Claim
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1. In a signal processor, a method of determining measurements for one or more blood parameters of pulsing blood, the method comprising:

  • receiving a first intensity signal from a light-sensitive detector which detects light of a first wavelength attenuated by body tissue carrying pulsing blood;

    receiving a second intensity signal from the light-sensitive detector which detects light of a second wavelength attenuated by body tissue carrying pulsing blood;

    electronically transforming the first and second intensity signals into the frequency domain;

    electronically determining values of the transformed first and second intensity signals that represent desired physiological data;

    electronically combining the transformed first and second intensity signals to form a composite signal comprising physiological information from both the transformed first and second intensity signals; and

    electronically analyzing the composite signal using one or more physiologically-based rules; and

    electronically determining the measurement of the blood parameter based at least in part on results of the analysis.

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