| 摘要 |
PURPOSE:To realize a software type control for the capacitor's capacity within a filter, by installing a means to vary the characteristics of the filter consisting of a resistance and a capacitor plus a means to decide the presence or absence of a noise contained in a digital signal. CONSTITUTION:The computer 7 applies the signal to the switch signal generator 53 of the input/output device 5 to control the switch device 42 of the filter circuit 4. The generator 53 applies the switch signal 43 to the device 42 to turn on the switch S1 and inserts the capacitor C1 to be preset. The digital contact 1a is turned on and off, and the noise is detected by the digital signal detector 51 when the noises overlap on the line 3 to be delivered to the computer 7. When the presence of noise is decided in the computer 7, a control is given to the device 42 to increase by a step the capacitor's capacity of the circuit 4 based on the prescribed program. The computer 7 carries out an input action of the digital input signal in case the absence of noise is decided. In case the input signal of the computer 7 has a sufficient room to the noise, the speed of transmission can be set a high level when necessary. |
