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美国联邦通信委员会(FCC)在某些报告中指出,高清晰度电视系统应与现有NTSC系统相兼容。图像宽高比从现有的4:3改变成16:9,意味着摄像机和全部制作装置必须加以改变。如果接受了这种新的宽高比,就需要利用新技术来开发宽的、亮的、清晰的屏幕。当观看角度增大时,当前投影系统的亮度和聚焦就都改变了,正如我们大家所知道的那样。日本开发的一种高清晰度电视系统采用1125行/
The U.S. Federal Communications Commission (FCC) states in some reports that HDTV systems should be compatible with existing NTSC systems. Changing the aspect ratio from the existing 4: 3 to 16: 9 means that the camera and all production equipment must be changed. If you accept this new aspect ratio, you need to use new technologies to develop wide, bright, clear screens. As the viewing angle increases, the brightness and focus of the current projection system have changed, as we all know. Developed in Japan, a high-definition television system with 1125 lines /