电话由于传声迅速、使用简便,因而在通信领域中成为规模最大、使用最多的一种手段。它已与现代生活结下了不解之缘。电话问世100多年来,尤其是最近20多年,科学技术日新月异,可谓一日千里。如今电话种类之多,更新之快,功能之全,使用范围之广,通信距离之远,都是电话始祖贝尔先生始料未及的。在电话百花园中,能闻声见影的电视电话,尤为惹人注目。电视电话的问世扩展了电话的功能,同时给人们以“声”和“形”两方面的感受。电视电话机由我们熟悉的“电话”和“电视”两部分组成。上面装有电视摄像机和电视接收机。电视摄像机相当于一位高超 Because of the rapid transmission of sound and ease of use, telephony has become the largest and most used means of communication in the field of communications. It has formed an indissoluble bond with modern life. More than 100 years since the advent of the telephone, especially in the recent 20 years, the science and technology are changing with each passing day. Today, many types of phones, faster updates, full-featured, wide range of use, communication distance, are the ancestors Bell phone unexpected. In the phone garden, can hear the video of the TV and telephone, is particularly striking. The advent of TV and telephone has expanded the function of the telephone while giving people the feeling of both “sound” and “shape”. TV set by our familiar “phone ” and “TV ” two parts. It has a TV camera and a TV receiver on it. TV camera is equivalent to a superb