| 摘要 |
PROBLEM TO BE SOLVED: To provide a technology for removing noise from multiple signals including a pulse wave.SOLUTION: A controller 11 acquires a first signal showing a pulse wave of a living body from a first measuring unit 131 measuring the pulse wave, through an amplifier 133 and an A/D conversion unit 134. The controller 11 acquires a second signal showing a pulse wave of the living body from a second measuring unit 132 measuring the pulse wave at a sensitivity level different from that of the first measuring unit 131. A sensitivity ratio estimation unit 113 estimates a sensitivity ratio between the first measuring unit 131 and the second measuring unit 132 on the basis of each spectrum of the first and second signals. A subtraction coefficient calculation unit 114, a subtraction filter calculation unit 116 and a spectrum subtraction unit 117 use the ratio estimated by the sensitivity ratio estimation unit 113 to subtract one spectrum of the spectra from the other so as to cancel noise included in each spectrum. |
