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某君几年前买了一台上海牌Z237-1A型37cm彩电,最近出现图像与彩色错位的故障现象,即在收看时可见彩色象镶在黑白图像的右边,两者的距离大约相隔2～3mm,甚觉别扭。经分析,这是一种彩色镶边现象,原因是亮度信号没有延时或延时不够所造成。在彩色电视机内,因其色解码器中的色通道频带要比亮度通道窄,故色差信号到达视放矩阵电路的时间将落后于亮度信号约0.5～0.7μs,对此情况若不采取相关措施,便会出现彩色镶边现象。为此,一般彩电在
A few years ago, a certain Jun bought a Shanghai brand Z237-1A 37cm color TV, recently appeared the phenomenon of image and color mismatch, that is seen in the viewing color as black and white image on the right, the distance between the two about 2 ~ 3mm, very awkward. After analysis, this is a color edge phenomenon, because the brightness signal delay or delay is not caused by enough. In the color TV set, because the color channel frequency band in the color decoder is narrower than the brightness channel, the time when the color difference signal reaches the viewing matrix circuit will lag behind the brightness signal by about 0.5~0.7 μs. In this case, if the correlation is not taken Measures, there will be colored striped phenomenon. To this end, the general color TV