| 摘要 |
The collector of a transistor (Q3) is connected through differentiating circuits (C4,R15) and through the collector of a transistor (Q7) to a clock pulse terminal (CP) of a D flip-flop (A13). Diodes (D4,D5) are connected through their own anodes to the collectors of transistors (Q5,Q7), and are also connected through their cathodes to the input terminal of an AND gate (AND1). Output logic signals (01,02) of a microprocessor (A10) re supplied through a transistor (Q11) to an input terminal of an AND gate (AND3). Main picture or sub-picture selecting signals are supplied through transistors (Q8)(Q9) to an input terminal (D) of a D flip-flop (A16). |
