大家知道，多媒体包括文字、数据、图形、图像、视像和声音等媒体，其传输速率从2kbit人到十几兆比特每秒不等。80年代，由于数据压缩和解压缩技术的发展成熟，使得多媒体计算机技术走向实用化。基于多媒体PC机技术的进步和用户的需求，建立多媒体大型网络已成为当务之急。但PC As we all know, multimedia, including text, data, graphics, images, video and sound media, the transmission rate from 2kbit people to more than a dozen megabits per second. In the 1980s, due to the maturity of data compression and decompression technologies, multimedia computer technology has been put into practical use. Based on the progress of multimedia PC technology and the needs of users, establishing a large-scale multimedia network has become a top priority. But PC