论文部分内容阅读
19世纪中叶,电报和电话相继诞生和应用,使人类信息交换进入“电信”新纪元,一百多年来,人们通过电报电话传递和交换着大量信息,缩短了空间,促进了人类文明和进步。在电信领域中,电报机和电话机均属于传递单一媒体信息的用户终端设备。电报以“点、划”电信号为媒体;电话以模拟的语音信号为媒体。在技术发展的初、中期、由于人们之间
In the mid-19th century, telegrams and telephones were born and applied one after another to allow the exchange of human information into a new era of “telecommunications.” For more than 100 years, people have transmitted and exchanged vast amounts of information by telegraph and telephone, shortening space and promoting human civilization and progress. In the field of telecommunications, both telegraph and telephone belong to the user terminal equipment that delivers a single piece of media information. Telegraphs use the “point and stroke” signals as media; telephones use analog voice signals as media. In the early, mid-term technological development, due to people