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<html><head><title>饮水思源精华区</title><Content-type: text/html; charset=gb2312><link rel=stylesheet type=text/css href="bbsdl.css"></head><table cellspacing=0 class=title width=90%><th class=title align=left width=20%>饮水思源站</th><th class=title align=center width=60%>文章阅读</th><th class=title align=right width=20%>精华区离线浏览</th></tr></table><hr><table align=center cellspacing=1 class=doc><tr><td>发信人:&nbsp;fangf&nbsp;(方方),&nbsp;信区:&nbsp;DSP<br>标&nbsp;&nbsp;题:&nbsp;收放自如的动感-多媒体数据压缩技术问答(一)&nbsp;<br>发信站:&nbsp;饮水思源站&nbsp;(Mon&nbsp;Jun&nbsp;&nbsp;7&nbsp;17:38:55&nbsp;1999)&nbsp;,&nbsp;站内信件<br>问：&nbsp;您&nbsp;是&nbsp;多&nbsp;媒&nbsp;体&nbsp;数&nbsp;据&nbsp;压&nbsp;缩&nbsp;领&nbsp;域&nbsp;的&nbsp;专&nbsp;家，&nbsp;在&nbsp;您&nbsp;看&nbsp;来，&nbsp;多&nbsp;媒&nbsp;体<br>&nbsp;数&nbsp;据&nbsp;压&nbsp;缩&nbsp;和&nbsp;普&nbsp;通&nbsp;数&nbsp;据&nbsp;压&nbsp;缩&nbsp;的&nbsp;区&nbsp;别&nbsp;何&nbsp;在&nbsp;？&nbsp;<br><br>----&nbsp;答：&nbsp;我&nbsp;们&nbsp;可&nbsp;以&nbsp;把&nbsp;数&nbsp;据&nbsp;分&nbsp;为&nbsp;两&nbsp;类，&nbsp;一&nbsp;类&nbsp;是&nbsp;将&nbsp;模&nbsp;拟&nbsp;信&nbsp;号&nbsp;数<br>&nbsp;字&nbsp;化&nbsp;后&nbsp;得&nbsp;来&nbsp;的&nbsp;多&nbsp;媒&nbsp;体&nbsp;数&nbsp;据，&nbsp;另&nbsp;一&nbsp;类&nbsp;是&nbsp;与&nbsp;文&nbsp;字&nbsp;和&nbsp;字&nbsp;符&nbsp;有&nbsp;关<br>&nbsp;的&nbsp;文&nbsp;本&nbsp;数&nbsp;据。&nbsp;多&nbsp;媒&nbsp;体&nbsp;数&nbsp;据&nbsp;压&nbsp;缩&nbsp;主&nbsp;要&nbsp;是&nbsp;基&nbsp;于&nbsp;视&nbsp;频、&nbsp;音&nbsp;频&nbsp;等&nbsp;<br>多&nbsp;媒&nbsp;体&nbsp;信&nbsp;号&nbsp;的&nbsp;处&nbsp;理&nbsp;与&nbsp;编&nbsp;码&nbsp;等&nbsp;等&nbsp;技&nbsp;术，&nbsp;而&nbsp;文&nbsp;本&nbsp;数&nbsp;据&nbsp;压&nbsp;缩&nbsp;或&nbsp;<br>者&nbsp;说&nbsp;普&nbsp;通&nbsp;数&nbsp;据&nbsp;压&nbsp;缩&nbsp;的&nbsp;基&nbsp;础&nbsp;是&nbsp;字&nbsp;符&nbsp;或&nbsp;字&nbsp;符&nbsp;串&nbsp;的&nbsp;编&nbsp;码。&nbsp;目&nbsp;前<br>&nbsp;文&nbsp;本&nbsp;数&nbsp;据&nbsp;压&nbsp;缩&nbsp;和&nbsp;多&nbsp;媒&nbsp;体&nbsp;数&nbsp;据&nbsp;压&nbsp;缩&nbsp;在&nbsp;算&nbsp;法&nbsp;上&nbsp;的&nbsp;区&nbsp;别&nbsp;主&nbsp;要&nbsp;<br>表&nbsp;现&nbsp;在&nbsp;两&nbsp;个&nbsp;方&nbsp;面，&nbsp;一&nbsp;是&nbsp;是&nbsp;否&nbsp;允&nbsp;许&nbsp;有&nbsp;误&nbsp;差，&nbsp;二&nbsp;是&nbsp;算&nbsp;法&nbsp;有&nbsp;没&nbsp;<br>有&nbsp;高&nbsp;级&nbsp;模&nbsp;型&nbsp;可&nbsp;以&nbsp;利&nbsp;用。&nbsp;首&nbsp;先&nbsp;在&nbsp;误&nbsp;差&nbsp;方&nbsp;面，&nbsp;对&nbsp;于&nbsp;多&nbsp;媒&nbsp;体&nbsp;模&nbsp;<br>拟&nbsp;信&nbsp;号&nbsp;来&nbsp;说，&nbsp;信&nbsp;号&nbsp;本&nbsp;身&nbsp;的&nbsp;精&nbsp;度&nbsp;很&nbsp;高。&nbsp;模&nbsp;拟&nbsp;信&nbsp;号&nbsp;是&nbsp;连&nbsp;续&nbsp;的，<br>&nbsp;如&nbsp;果&nbsp;用&nbsp;数&nbsp;字&nbsp;化&nbsp;的&nbsp;方&nbsp;式&nbsp;进&nbsp;行&nbsp;离&nbsp;散&nbsp;表&nbsp;示&nbsp;时，&nbsp;则&nbsp;难&nbsp;免&nbsp;会&nbsp;引&nbsp;入<br>&nbsp;误&nbsp;差。&nbsp;因&nbsp;此，&nbsp;既&nbsp;然&nbsp;在&nbsp;数&nbsp;字&nbsp;化&nbsp;的&nbsp;过&nbsp;程&nbsp;中&nbsp;已&nbsp;经&nbsp;引&nbsp;入&nbsp;了&nbsp;误&nbsp;差，<br>&nbsp;在&nbsp;压&nbsp;缩&nbsp;阶&nbsp;段&nbsp;应&nbsp;该&nbsp;也&nbsp;允&nbsp;许&nbsp;有&nbsp;误&nbsp;差，&nbsp;只&nbsp;要&nbsp;误&nbsp;差&nbsp;的&nbsp;级&nbsp;别&nbsp;不&nbsp;超&nbsp;<br>过&nbsp;数&nbsp;字&nbsp;化&nbsp;的&nbsp;阶&nbsp;段&nbsp;就&nbsp;可&nbsp;以。&nbsp;不&nbsp;仅&nbsp;如&nbsp;此，&nbsp;实&nbsp;际&nbsp;上&nbsp;有&nbsp;时&nbsp;即&nbsp;使&nbsp;有<br>&nbsp;误&nbsp;差，&nbsp;只&nbsp;要&nbsp;眼&nbsp;睛&nbsp;看&nbsp;不&nbsp;出&nbsp;来，&nbsp;也&nbsp;还&nbsp;是&nbsp;可&nbsp;以&nbsp;容&nbsp;忍&nbsp;的。&nbsp;而&nbsp;普&nbsp;通<br>&nbsp;文&nbsp;本&nbsp;数&nbsp;据&nbsp;的&nbsp;压&nbsp;缩&nbsp;就&nbsp;不&nbsp;同&nbsp;了，&nbsp;必&nbsp;须&nbsp;是&nbsp;无&nbsp;损&nbsp;失&nbsp;的。&nbsp;因&nbsp;为&nbsp;一&nbsp;旦<br>&nbsp;有&nbsp;损&nbsp;失，&nbsp;信&nbsp;息&nbsp;就&nbsp;不&nbsp;确&nbsp;切&nbsp;了。&nbsp;正&nbsp;因&nbsp;为&nbsp;如&nbsp;此，&nbsp;多&nbsp;媒&nbsp;体&nbsp;数&nbsp;据&nbsp;的&nbsp;<br>压&nbsp;缩&nbsp;必&nbsp;须&nbsp;在&nbsp;追&nbsp;求&nbsp;压&nbsp;缩&nbsp;比&nbsp;率&nbsp;提&nbsp;高&nbsp;的&nbsp;同&nbsp;时&nbsp;充&nbsp;分&nbsp;考&nbsp;虑&nbsp;到&nbsp;视&nbsp;觉&nbsp;<br>和&nbsp;听&nbsp;觉&nbsp;的&nbsp;感&nbsp;受，&nbsp;而&nbsp;普&nbsp;通&nbsp;数&nbsp;据&nbsp;的&nbsp;压&nbsp;缩&nbsp;则&nbsp;无&nbsp;此&nbsp;顾&nbsp;虑。&nbsp;其&nbsp;次，&nbsp;<br>在&nbsp;高&nbsp;层&nbsp;模&nbsp;型&nbsp;方&nbsp;面，&nbsp;文&nbsp;本&nbsp;数&nbsp;据&nbsp;要&nbsp;比&nbsp;多&nbsp;媒&nbsp;体&nbsp;数<br>据&nbsp;有&nbsp;利。&nbsp;文&nbsp;本&nbsp;数&nbsp;据&nbsp;通&nbsp;常&nbsp;是&nbsp;和&nbsp;语&nbsp;言&nbsp;相&nbsp;关&nbsp;的，&nbsp;可&nbsp;以&nbsp;通&nbsp;过&nbsp;自&nbsp;然&nbsp;<br>语&nbsp;言&nbsp;对&nbsp;之&nbsp;进&nbsp;行&nbsp;描&nbsp;述，&nbsp;自&nbsp;然&nbsp;语&nbsp;言&nbsp;就&nbsp;是&nbsp;它&nbsp;的&nbsp;一&nbsp;个&nbsp;高&nbsp;层&nbsp;模&nbsp;型。&nbsp;<br>如&nbsp;果&nbsp;采&nbsp;用&nbsp;高&nbsp;层&nbsp;模&nbsp;型&nbsp;对&nbsp;之&nbsp;进&nbsp;行&nbsp;描&nbsp;述，&nbsp;就&nbsp;可&nbsp;以&nbsp;得&nbsp;到&nbsp;很&nbsp;高&nbsp;的&nbsp;压<br>&nbsp;缩&nbsp;比&nbsp;率。&nbsp;而&nbsp;对&nbsp;于&nbsp;多&nbsp;媒&nbsp;体&nbsp;数&nbsp;据，&nbsp;你&nbsp;却&nbsp;很&nbsp;难&nbsp;找&nbsp;出&nbsp;这&nbsp;样&nbsp;一&nbsp;个&nbsp;比<br>&nbsp;较&nbsp;抽&nbsp;象&nbsp;的&nbsp;高&nbsp;层&nbsp;模&nbsp;型。&nbsp;<br>&nbsp;&nbsp;<br><br>--<br>-----------------------------------------------<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;因一个词的力量<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;我重新开始生活<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;我生来就认识你<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;要把你称作<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;自由<br><br>※&nbsp;来源:·饮水思源站&nbsp;bbs.sjtu.edu.cn·[FROM:&nbsp;202.120.8.3]<br></tr></table><br><captio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