| 摘要 |
PROBLEM TO BE SOLVED: To provide a pulse-wave measurement apparatus which eliminates noise component derived from the frequency of a commercial power source, and to provide a method for eliminating the noise component. SOLUTION: The pulse-wave measurement apparatus comprises a pulse-wave sensor, filters to filter pulse-wave signals, and a means to measure information on the pulse-wave based on the filtered pulse-wave signals. A first order or a second order analog low pass filter, a preceding digital low pass filter, and a subsequent high-frequency cut-off digital differential filter constitute the filters. The preceding filter is constituted to have a response of approximately zero at either 50 Hz or 60 Hz of the frequency of the commercial power source, and the subsequent filter is constituted to have a response of approximately zero at the other frequency of the commercial power source. The noise component is eliminated by using these filters. COPYRIGHT: (C)2004,JPO
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