| 摘要 |
PURPOSE:To eliminate the DC shifting of a sigmoid distortion correcting voltage and to obtain accurate interlacing without having a pairing, etc., by superimposing a correcting signal upon a vertical deflecting signal while a shift is occurred. CONSTITUTION:Vertical deflecting signals are supplied to an input terminal 1 which is connected with one input terminals 2a of a comparator 2 and the comparator 2 is connected with a vertical deflecting coil 4 through an amplifier 3. An S-shaped correction circuit 7 is connected between the coil 4 and earth, and is connected with the other input terminal 2b of the comparator 2 through a feedback circuit 8. Therefore, the DC shift of a sigmoid distortion correcting voltage can be corrected by superimposing a correcting signal of the level corresponding to a shifting quantity upon period signals for sigmoid distortion correction or vertical deflecting signals in synchronism with the vertical deflecting period in which the shift is occurred, and interlacing of a pairing, etc., can be prevented from being deteriorated. |
