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计算机初进家庭时,为了减少花销,很少使用计算机显示器,而是利用电视机作为计算机的显示屏,此时计算机的输出多数是黑白的文字和极其简单的图形。计算机技术的高速发展使我们不能把计算机的输出连到电视机或录像机这类视频设备上,因为计算机需要显示出的内容远比电视图像的细节多得多,因此计算机使用了高清晰度的显示器,相应的就有了CGA、EGA、VGA和SVGA标准和相应的显示器。然而,把计算机产生的图像送到录像机上记录下来的需求依然存在。同样,把视频信号,如摄像机、录像机、天线等输出信号送到计算机中进行分析、处理的工作也是非常有意义的。
When computers enter the home, in order to reduce costs, computer monitors are seldom used. Instead, the television is used as the display screen of the computer. At this time, the output of the computer is mostly black and white text and extremely simple graphics. The rapid development of computer technology prevented us from connecting the output of a computer to a video device such as a television or video recorder because the computer needed to display far more detail than the image of the television so that the computer used a high-definition display , The corresponding CGA, EGA, VGA and SVGA standards and the corresponding display. However, the need to record computer generated images onto a VCR still exists. Similarly, the video signal, such as cameras, video recorders, antennas and other output signals sent to the computer for analysis, processing work is also very meaningful.