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选择自由度很大是公用电话纲的机能特点。用电话与远距离的亲友能够自由谈话,是符合人们的愿望的。在电话装置里,附加一定的设备,使得任何人能够通过电话,并能看见对方,便成了通信工作者多年来的理想。可见信息不仅有对方的面貌,而且有物体、文字、图形、及图象等,把这些信息用通信方式传送到对方的电视电话,就是图像通信的主
The great freedom of choice is a feature of the public telephone directory. It is in line with people’s wishes to be able to talk freely with friends and relatives over long distances by telephone. In telephony installations, the addition of equipment that makes it possible for anyone to access the telephone and to see each other has become an ideal for communication workers for many years. Visible information not only the other side of the face, but also objects, text, graphics, and images, etc., the information sent to each other by means of video telephony, is the main image communications