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SIGNAL PROCESSING APPARATUS

  • US 20120165631A1
  • Filed: 02/22/2012
  • Published: 06/28/2012
  • Est. Priority Date: 10/07/1994
  • Status: Active Grant
First Claim
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1. In a signal processor, a method of determining a measurement of a characteristic of arterial blood, the method comprising:

  • transforming first and second time-domain signals into respective first and second frequency-domain signals, the first and second time-domain signals being indicative of light that has been attenuated by body tissue carrying arterial blood;

    determining one or more values for a plurality of non-zero frequency components of the first and second frequency-domain signals that are indicative of the strength of one or more frequency components of the first frequency-domain signal versus the strength of one or more corresponding frequency components in the second frequency-domain signal;

    selecting one or more frequency components that exhibit physiological characteristics of arterial blood using, at least in part, the corresponding one or more values; and

    determining the measurement for the characteristic of arterial blood using the selected one or more frequency components.

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