电视画面中经常含有比普通画面的亮度高得多的高亮度信号。摄象管的电子束是不能完全显示这种高亮度信号的,结果就在电视图象中产生了讨厌的高亮度开花和彗尾现象。增加电子束电流虽然可大大减轻这种讨厌现象,但却降低了清晰度并增加了惰性。高亮度信号处理问题现已通过两种方法得到有效的解 Television screens often contain high-brightness signals that are much brighter than normal screens. The electron beam from the camera tube does not fully display this high brightness signal, resulting in annoying high brightness blooming and comet tail phenomena in the television image. Increasing the beam current greatly reduces this annoyance, but it reduces clarity and adds inertness. High-brightness signal processing problems have now been effectively solved by two methods