| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce the influence of operation delay when the operation of a filter circuit having an integrated circuit is started. SOLUTION: When a control circuit 3 operates a photoelectric pulse detection sensor 101 with a terminal (a) as '1', an analog switch 1 is left to be opened and the output is prevented from being supplied to the amplifying circuit of a post stage while a low pass filter circuit 102 generates the output of operation delay owing to an integral circuit, The control circuit 3 sets the output of a terminal (b) to be '1' and closes the analog switch 1 after delay time T1 owing to the time constant of the integral circuit of the low pass filter circuit 102 passes after desired time passes from time when a signal is inputted to the low filter circuit 2. The output of the low pass filter circuit 102 is supplied to the amplifying circuit 104, etc., of the post-stage.</p> |
