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众所周知,在传统的模拟电视系统中,一般采用50或60Hz隔行扫描,将一帧图像分为两场扫描,是使图像信号的传送频带降低二分之一,基本上不易觉察有大面积的闪烁。但每行亮度信号仍以帧频25或30Hz出现,小于45.8Hz临界闪烁频率。所以,隔行扫描的缺点在于电视屏幕图像存在“闪烁干扰”,不仅降低了图像的清晰度,而且易使人眼感疲劳。
As we all know, in the traditional analog television system, the general use of 50 or 60Hz interlaced, a frame of image is divided into two scans, the image signal is to reduce the transmission band by one half, basically not easy to detect a large area of the flash . However, each line brightness signal still appears at frame rate 25 or 30Hz, less than 45.8Hz critical flicker frequency. Therefore, the disadvantage of interlacing is that there is “flickering interference” in the TV screen image, which not only reduces the sharpness of the image but also makes people feel tired.