Method for reducing noise, and pulse photometer using the method
First Claim
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 data;
computing a light absorbance ratio obtained from the first electric signal and the second electric signal, for each one of frequency ranges dividing an observed frequency band; 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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Abstract
A living body is irradiated 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. The first light beam and the second light beam, which have been reflected or transmitted from the living body, are converted into a first electric signal corresponding to the first wavelength and a second electric signal corresponding to the second wavelength, as the observed pulse data. A light absorbance ratio obtained from the first electric signal and the second electric signal is computed, for each one of frequency ranges dividing an observed frequency band. It is determined 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.
153 Citations
14 Claims
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1. A method of processing an observed pulse wave data, comprising steps of:
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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 data;
computing a light absorbance ratio obtained from the first electric signal and the second electric signal, for each one of frequency ranges dividing an observed frequency band; 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. - View Dependent Claims (2, 12)
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3. A method of processing an observed pulse wave data, comprising steps of:
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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 data; and
whitening the first electric signal and the second electric signal by an affine transformation using a known light absorbance ratio, in order to separate a pulse signal component and a noise component which are contained in the observed pulse data. - View Dependent Claims (4, 5, 6, 7, 8, 13)
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9. A method of processing an observed pulse wave data, comprising steps of:
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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 data;
whitening the first electric signal and the second electric signal to separate a pulse signal component and a noise component which are contained in the observed pulse data, for each one of frequency ranges dividing an observed frequency band. - View Dependent Claims (10, 11, 14)
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Specification