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1.图像颗粒较粗,景物右边轮廓有黑条。从维修经验得知,这种现象多数是由于视频磁头磨损而引起的。我们知道,景物的轮廓处,特别是黑白交界处是高频区,此部分信号不能被磁头拾取,就造成了一些黑条。因为磨损后的磁头缝隙度变宽,高频响应变差。并且电视机扫描总是从左到右,所以仅在轮廓右边拉黑线。图像细节是由高频信号反映的,分辨不清,图像颗粒就粗大。如果仅是颗粒较粗,那也可能跟噪波消除电
1. The image is coarse, with black bars on the right side of the scene. From the maintenance experience that most of this phenomenon is due to video head wear caused. We know that the outline of the scene, especially the junction of black and white is a high-frequency area, this part of the signal can not be picked up by the head, resulting in some black bars. Because of wear and tear of the head gap becomes wider, high-frequency response worsened. And the TV scans always from left to right, so just pull the black line to the right of the outline. Image detail is reflected by the high-frequency signal, indistinguishable, coarse particles of the image. If only the coarse particles, it may also eliminate noise with the noise