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Method for reducing noise, and pulse photometer using the method

  • US 7,025,728 B2
  • Filed: 09/12/2003
  • Issued: 04/11/2006
  • Est. Priority Date: 06/30/2003
  • Status: Active Grant
First Claim
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1. A method of processing an observed pulse wave data, comprising steps of:

  • irradiating a living body with a first light beam having a first wavelength and a second light beam having a second wavelength which is different from the first wavelength;

    converting the first light beam and the second light beam, which have been reflected or transmitted from the living body, into a first electric signal corresponding to the first wavelength and a second electric signal corresponding to the second wavelength, as the observed pulse wave data;

    dividing a frequency band of the observed pulse wave data into a plurality of frequency ranges;

    computing a light absorbance ratio obtained from the first electric signal and the second electric signal, for each one of the divided frequency ranges; and

    determining that noise is not mixed into the observed pulse wave data in a case where a substantial match exists among light absorbance ratios computed for the respective frequency ranges.

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