| 摘要 |
<p>PURPOSE: To achieve simple and effective return to a zero point by providing a first filter circuit to filter input signals received from a pressure transducer as well as noise, and a second filter circuit to filter dynamic pressure signals while transmitting average pressure signals. CONSTITUTION: A circuit 10 included in a blood pressure starting device has an input terminal 12 to receive an output signal Vin including noise, an average pressure signal, and a dynamic pulsation signal from a pressure transducer in an organism and it is connected to a blood pressure monitor at an output terminals 26. As a switch 20 is charged, a filter circuit 14 and a switching circuit 16 are energized through a bounce eliminating circuit 18. A filter circuit 14 is provided with a first and a second filter circuits 14a, 14b, so it functions as a low-pass filter to filter noise in a signal mode, and that it functions in a zero point return mode as a low-pass passing filter to filter dynamic components of a pressure signal in the organism generated by return of a pressure sensor to a zero point.</p> |
