| 摘要 |
PURPOSE:To realize stabilized DC reproduction without using a delay coil in a circuit used for a video display of a video display means other than a cathode- ray tube, by specifying the level of a video signal by turning on and off a switching element. CONSTITUTION:If a video signal, whose synchronous signal component is cut off, is given to a collector of an NPN transistor 42 through a capacitor 41 for cutting direct current, a pulse of a horizontal synchronous signal turns on the transistor 42 with a timing given to the base of the transistor 42 so that the collector voltage is forcibly made to voltage Vs. By setting the voltage Vs properly, a video signal having a fixed pedestal level can be obtained whether the video signal is of a bright screen or a dark screen. |
