| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a pulse wave sensor capable of precisely measuring a subject's pulse wave. <P>SOLUTION: The pulse wave sensor includes an optical sensor part that acquires pulse wave data by applying light to a living body from a light emitting part and making a light receiving part detect intensity of the light transmitted through the living body, and a filter part 12 which applies filtering to an output signal of the optical sensor part. The filter part 12 includes: an HPF circuit 210 which removes a low-frequency component superimposed on the output signal of the optical sensor part; a voltage follower circuit 220 which transmits an output signal of the HPF circuit 210 to a subsequent stage; an LPF circuit 230 which removes a high-frequency component superimposed on an output signal of the voltage follower circuit 220; a first amplifier circuit 240 which amplifies an output signal of the LPF circuit 230; a BPF circuit 250 which removes the low-frequency and high-frequency components superimposed on an output signal of the first amplifier circuit 240; and a second amplifier circuit 260 which amplifies an output signal of the BPF circuit 250. <P>COPYRIGHT: (C)2013,JPO&INPIT |
