Signal processing method, and pulse photometer using the method
First Claim
1. A method of processing observed data, comprising steps of:
- receiving a first signal coming from a medium for a predetermined time period as a first data set;
receiving a second signal coming from the medium for the predetermined time period as a second data set;
plotting the first data set and the second data set on a two-dimensional orthogonal coordinate system; and
rotating the first data set and the second data set plotted on the coordinate system by a rotating matrix to separate a signal component and a noise component contained in the observed data.
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Abstract
A pulse photometer adapted to observe a pulse wave of a living body is disclosed. A light emitter is adapted to irradiate the 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. A converter is operable to convert the first light beam and the second light beam, which have been reflected or transmitted from the living body, into a first data set corresponding to the first wavelength and a second data set corresponding to the second wavelength. A processor is operable to process the first data set and the second data set with a rotating matrix to separate a signal component and a noise component contained in the pulse wave.
160 Citations
11 Claims
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1. A method of processing observed data, comprising steps of:
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receiving a first signal coming from a medium for a predetermined time period as a first data set;
receiving a second signal coming from the medium for the predetermined time period as a second data set;
plotting the first data set and the second data set on a two-dimensional orthogonal coordinate system; and
rotating the first data set and the second data set plotted on the coordinate system by a rotating matrix to separate a signal component and a noise component contained in the observed data. - View Dependent Claims (2, 3)
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4. A pulse photometer adapted to observe a pulse wave of a living body, comprising
a light emitter, adapted to irradiate the 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; -
a converter, operable to convert the first light beam and the second light beam, which have been reflected or transmitted from the living body, into a first data set corresponding to the first wavelength and a second data set corresponding to the second wavelength; and
a processor, operable to process the first data set and the second data set with a rotating matrix to separate a signal component and a noise component contained in the pulse wave. - View Dependent Claims (5, 6, 7, 10, 11)
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8. A pulse photometer, comprising
a light emitter, adapted to irradiate 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; -
a converter, operable to convert the first light beam and the second light beam, which have been reflected or transmitted from the living body, into a first data set corresponding to the first wavelength and a second data set corresponding to the second wavelength; and
a processor, operable to;
plot the first data set and the second data set on a two-dimensional orthogonal coordinate system corresponding to the first wavelength and the second wavelength;
calculate a first norm value for the first data set and a second norm value for the second data set to obtain a norm ratio of the first norm value and the second norm value; and
obtain a concentration of at least one light-absorbing material in blood of the living body, based on the norm ratio. - View Dependent Claims (9)
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Specification