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六十年代初才出现的数字传输是为电报、电话、数据,传真等各种通信业务提供一种相对于模拟传输而言的新传输方式。随着集成电路的迅速发展和计算技术的广泛应用,进一步推动了数字传输技术的蓬勃发展。它的出现使现代通信超出了人与人之间通信的范围,实现了人与计算机之间的对话。它把所要传输的语言、文字、图象等各种模
Digital transmission, which appeared only in the early 1960s, provides a new transmission method for analog and telegraphy, telephone, data, fax and other communications services. With the rapid development of integrated circuits and the widespread application of computing technologies, the digital transmission technology is further promoted. Its emergence has made modern communication go beyond the scope of communication between people and realized the dialogue between human and computer. It sends the language, text, images and other modules to be transmitted