| 摘要 |
PURPOSE:To eliminate the titled circuit from being affected with external noise, while the line switching operation is performed, by making correction when the line switching operation is not normally executed. CONSTITUTION:A burst signal S5 obtained from a color signal of the PAL system is given to an input (a) of a switch 33 switchingly controlled with the output of a flip-flop 22 and given to an input (b) with a delay for one horizontal scanning period through a 1H delay line 31. The flip-flop 22 controls the line switching. A phase of an output signal of a contact (c) is detected with a reference demodulation carrier wave S6 of B-Y axis. An output of a phase detection circuit 3 makes the flip-flop 22 inoperative when the line switching is correctly done. When the line switching is not done correctly, the flip-flop 22 is controlled for normal operation. |
