随着科技尤其是半导体工业的飞速发展,各种类型各种用途的媒体应运而生,如:W、PC、Inter-net、可视电话、VCD、LD、DVD、录放像机、功放音响、电话等等,而且随着科技的发展,新的媒体还在不断出现;家庭中拥有的媒体数量也在不断增力口,现有的电视或PC受技术水平所限,无法实现连接所有媒体的能力。如每个媒体都配一个终端, With the rapid development of technology, especially in the semiconductor industry, media of various types and uses have come into being, such as W, PC, Inter-net, videophone, VCD, LD, DVD, And so on. With the development of science and technology, new media are still emerging. The number of media owned by families is also increasing. Existing television or PC are limited in technology and can not be connected to all media . If each media is equipped with a terminal,