当高清晰度电视在全世界统一制式基础上全面推广使用之前,普通电视的画面质量还有作某些改进的余地。最明显的外观特征是改用宽屏幕。实际上为了接收以宽高比4:3的电视标准发送的节目,在信号转换时对中心区与边缘区的转换比率作了特别处理,这样,在16:9的宽屏幕荧光屏上显示时,图像的畸变小了 Before high definition television could be fully used on the basis of a unified system in the world, there was still room for improvement in the picture quality of ordinary television. The most obvious appearance feature is the switch to widescreen. In fact, in order to receive programs transmitted on TV standards with a 4: 3 aspect ratio, the conversion ratio between the center area and the edge area was specially handled during signal conversion so that when displayed on a 16: 9 widescreen fluorescent screen, Image distortion is small