| 摘要 |
a system controller(20) for controlling peripheral equipments according to data inputted by a user in order to control the system, data outputted from an overstate detector and horizontal and vertical synchronous signals outputted from a deflection unit; an R,G,B switch(80) for switching R,G,B color signals, mixing them with a color difference signal outputted from a video demodulator(60) and providing it to a picture tube; a delay(110) for delaying a video mute control signal outputted from the system controller for a predetermined period of time; and a video mute unit(70) for switching an OSD video control signal supplied to the R,G,B switch according to the delayed video mute control signal to mute a video.
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