微电子技术和先进的通信系统的密切结合,使社会劳动生产方式和产业结构发生了深刻变化。人类社会由工业时代进入信息时代。自九十年代以来,在社会信息量继续激增的环境中,迫切需要实现多媒体高精度的信息传递和分配。在技术方面,数据处理能力和通信网传输容量也分别迈上了更高台阶。 The close combination of microelectronic technology and advanced communication systems has brought about profound changes in the mode of social labor production and industrial structure. Human society has entered the information age from the industrial age. Since the nineties, in the environment where social information continues to surge, there is an urgent need to achieve high-precision multimedia information delivery and distribution. In terms of technology, the data processing capabilities and the transmission capacity of the communication network have respectively stepped up to a higher level.