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不久以前,上Internet意味着交换E-mail信息或上BBS,所需设备也只是一个调制解调器而已。通过调制解调器获取文本信息(当时还没有图像信息),且调制解调器的速率仅为1.2Kbps～9.6Kbps。随着Internet迅速发展,Internet上的信息也日益丰富,其主要内容从生活到工作,乃至娱乐无所不有,可以说连蘑菇的价格都可从Internet上获得;而Internet上的信息形式早已从80年代的文本换成多媒体形式,不仅图文并茂,而且配以语音或动画,真可谓形式多样。信息迅速扩大,导致信道相对过窄,就象是一个巨大的池
Not long ago, on the Internet means to exchange E-mail messages or BBS, the required equipment is only a modem only. Get text messages via modem (no image information at the time), and modem speeds of only 1.2Kbps ~ 9.6Kbps. With the rapid development of the Internet, the information on the Internet is also increasingly rich, and its main content from life to work, and entertainment are omnipresent, it can be said that even the price of mushrooms can be obtained from the Internet; and the information form on the Internet has long been from The text of the 1980s was replaced by a multimedia format, which not only illustrated the images but also accompanied the sounds or the animations. The rapid expansion of information leads to relatively narrow channels, as if it were a huge pool