| 摘要 |
PROBLEM TO BE SOLVED: To avoid the complication of a circuit. SOLUTION: A network circuit 4 for generating an instruction signal 44 for instructing the operation of a signal processing circuit 5 is provided with a 1st terminal R1 connecting one terminal to a positive level P and connecting the other terminal to a signal processing circuit 5, a 2nd resistor R2 connected between the output of a character generation part 1 and the other terminal of the 1st resistor R1, a diode D1 connecting an anode to the output of the character signal generation part 1 and connecting a cathode to the other terminal of the 1st resistor R1, and a 3rd resistor R3 connected between the output of a false vertically synchronizing signal generation part 2 and the other terminal of the 1st register R1.
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