| 摘要 |
PURPOSE:To minimize deflection errors caused by noises to obtain an excellent picture display, by inserting a filter for removing noises with a gate circuit into the after stage of an input terminal to which a staircase wave is supplied only for the period of flat section of an inputted staircase wave. CONSTITUTION:When a pulse synchronous to the changing point of a staircase wave is inputted in an input terminal 122, a pulse having a narrow width is generated by triggering a monostable multivibrator 121. If a transistor 120 is turned on during the period during which the output is high in level, a filter composed of a resistance 118 and capacitor 119 is inserted into the emitter output of a transistor 116 and noises superimposed upon the flat section of the staircase wave are removed. |
