SIGNAL PROCESSING DEVICE, PULSE WAVE MEASURING APPARATUS, AND SIGNAL PROCESSING METHOD
First Claim
1. A signal processing device comprising:
- a first acquisition unit that acquires a first signal indicating a pulse wave of a living body from a first measuring unit that measures the pulse wave;
a second acquisition unit that acquires a second signal indicating the pulse wave of the living body from a second measuring unit that measures the pulse wave at different sensitivities from the first measuring unit;
an estimation unit that estimates a ratio of sensitivity of the first measuring unit to sensitivity of the second measuring unit from a first spectrum of the first signal and a second spectrum of the second signal; and
a subtraction unit that subtracts the second spectrum from the first spectrum so as to cancel noise included in the first spectrum and the second spectrum, using the ratio estimated by the estimation unit.
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Abstract
A signal processing device includes: a first acquisition unit that acquires a first signal indicating a pulse wave of a living body from a first measuring unit that measures the pulse wave; a second acquisition unit that acquires a second signal indicating the pulse wave of the living body from a second measuring unit that measures the pulse wave at different sensitivities from the first measuring unit; an estimation unit that estimates a ratio of sensitivity of the first measuring unit to sensitivity of the second measuring unit from a first spectrum of the first signal and a second spectrum of the second signal; and a subtraction unit that subtracts the second spectrum from the first spectrum so as to cancel noise included in the first spectrum and the second spectrum, using the ratio estimated by the estimation unit.
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Citations
13 Claims
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1. A signal processing device comprising:
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a first acquisition unit that acquires a first signal indicating a pulse wave of a living body from a first measuring unit that measures the pulse wave; a second acquisition unit that acquires a second signal indicating the pulse wave of the living body from a second measuring unit that measures the pulse wave at different sensitivities from the first measuring unit; an estimation unit that estimates a ratio of sensitivity of the first measuring unit to sensitivity of the second measuring unit from a first spectrum of the first signal and a second spectrum of the second signal; and a subtraction unit that subtracts the second spectrum from the first spectrum so as to cancel noise included in the first spectrum and the second spectrum, using the ratio estimated by the estimation unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A pulse wave measuring apparatus comprising:
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a first measuring unit that measures a pulse wave of a living body; a second measuring unit that measures the pulse wave of the living body at different sensitivities from the first measuring unit; a first acquisition unit that acquires a first signal indicating the pulse wave from the first measuring unit; a second acquisition unit that acquires a second signal indicating the pulse wave from the second measuring unit; an estimation unit that estimates a ratio of sensitivity of the first measuring unit to sensitivity of the second measuring unit from a first spectrum of the first signal and a second spectrum of the second signal; and a subtraction unit that subtracts the second spectrum from the first spectrum so as to cancel the noise included in the first spectrum and the second spectrum, using the ratio estimated by the estimation unit.
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13. A signal processing method comprising:
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acquiring, by a first acquisition unit, a first signal indicating a pulse wave of a living body from a first measuring unit that measures the pulse wave; acquiring, by a second acquisition unit, a second signal indicating the pulse wave of the living body from a second measuring unit that measures the pulse wave at different sensitivities from the first measuring unit; estimating, by an estimation unit, a ratio of sensitivity of the first measuring unit to sensitivity of the second measuring unit from a first spectrum of the first signal and a second spectrum of the second signal; and subtracting, by a subtraction unit, the second spectrum from the first spectrum so as to cancel noise included in the first spectrum and the second spectrum, using the ratio estimated by the estimation unit.
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Specification