| 摘要 |
PURPOSE:To remove the influence of a noise without delaying a response speed by modulating the output signal of a sensor to a time base and transmitting as the binary signal of a constant amplitude. CONSTITUTION:The output signal of a thermistor (sensor) 12 is comparated with the triangular wave signal of a constant cycle from a triangular wave generating circuit 27 in a comparator 26. Thereby, it is pulse duration modulated to the binary signal of the constant amplitude. This binary signal is transmitted to a microcomputer 19 through a lead wire 24 at the detecting signal. At this time, sensor information is converted to a signal modulated to a time base direction, so that even when a voltage level is slightly changed according to the influence of the noise, a distortion is not generated in the transmitted information but the influence of the noise can be completely removed. Since a capacitor for removing the noise is not used, the response speed of the signal is not delayed. |
