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📁 上海交通大学DSP学习的经典教程 文档为HTML格式,循序渐进,方便学习 本人从中收益菲浅,拿来共享
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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;&nbsp;高&nbsp;分&nbsp;辩&nbsp;率A/D&nbsp;变&nbsp;换&nbsp;器&nbsp;应&nbsp;用&nbsp;考&nbsp;虑(二)<br>发信站:&nbsp;饮水思源站&nbsp;(Sat&nbsp;Jun&nbsp;&nbsp;5&nbsp;10:21:46&nbsp;1999)&nbsp;,&nbsp;站内信件<br>----&nbsp;人&nbsp;们&nbsp;知&nbsp;道&nbsp;∑&nbsp;Δ&nbsp;变&nbsp;换&nbsp;器&nbsp;已&nbsp;经&nbsp;近30&nbsp;年&nbsp;了，&nbsp;但&nbsp;直&nbsp;到&nbsp;最&nbsp;近&nbsp;才&nbsp;有&nbsp;了&nbsp;<br>将&nbsp;其&nbsp;实&nbsp;现&nbsp;的&nbsp;工&nbsp;艺。&nbsp;这&nbsp;种&nbsp;器&nbsp;件&nbsp;假&nbsp;定&nbsp;宽&nbsp;带&nbsp;噪&nbsp;声&nbsp;已&nbsp;被&nbsp;混&nbsp;合&nbsp;在&nbsp;被&nbsp;测&nbsp;<br>信&nbsp;号&nbsp;中。&nbsp;<br><br><br>----&nbsp;∑&nbsp;Δ&nbsp;变&nbsp;换&nbsp;器&nbsp;采&nbsp;用&nbsp;过&nbsp;取&nbsp;样、&nbsp;积&nbsp;分&nbsp;和&nbsp;低&nbsp;或&nbsp;带&nbsp;通&nbsp;滤&nbsp;波&nbsp;组&nbsp;合&nbsp;技&nbsp;<br>术&nbsp;来&nbsp;降&nbsp;低&nbsp;噪&nbsp;声。&nbsp;一&nbsp;个&nbsp;∑&nbsp;Δ&nbsp;变&nbsp;换&nbsp;器&nbsp;由&nbsp;一&nbsp;系&nbsp;列&nbsp;馈&nbsp;电&nbsp;一&nbsp;个&nbsp;模&nbsp;拟&nbsp;电&nbsp;<br>压&nbsp;比&nbsp;较&nbsp;器&nbsp;的&nbsp;模&nbsp;拟&nbsp;积&nbsp;分&nbsp;器&nbsp;组&nbsp;成（&nbsp;见&nbsp;图1）。&nbsp;模&nbsp;拟&nbsp;比&nbsp;较&nbsp;器&nbsp;的&nbsp;输&nbsp;出&nbsp;<br>正&nbsp;向&nbsp;馈&nbsp;送&nbsp;到&nbsp;一&nbsp;个&nbsp;数&nbsp;字&nbsp;滤&nbsp;波&nbsp;器&nbsp;和&nbsp;反&nbsp;馈&nbsp;到&nbsp;一&nbsp;个1&nbsp;位D/A&nbsp;变&nbsp;换&nbsp;器。&nbsp;其&nbsp;<br>输&nbsp;出&nbsp;在&nbsp;正&nbsp;和&nbsp;负&nbsp;满&nbsp;量&nbsp;程&nbsp;变&nbsp;换&nbsp;范&nbsp;围&nbsp;之&nbsp;间&nbsp;转&nbsp;换&nbsp;成&nbsp;来&nbsp;自&nbsp;比&nbsp;较&nbsp;器&nbsp;输&nbsp;出&nbsp;<br>状&nbsp;态&nbsp;的&nbsp;函&nbsp;数。&nbsp;这&nbsp;些&nbsp;满&nbsp;量&nbsp;程&nbsp;正&nbsp;和&nbsp;负&nbsp;电&nbsp;压&nbsp;在&nbsp;输&nbsp;入&nbsp;端&nbsp;上&nbsp;相&nbsp;加，&nbsp;作&nbsp;<br>为&nbsp;积&nbsp;分&nbsp;器&nbsp;的&nbsp;顺&nbsp;序&nbsp;串&nbsp;之&nbsp;一。1&nbsp;位D/A&nbsp;变&nbsp;换&nbsp;器&nbsp;更&nbsp;靠&nbsp;近&nbsp;由&nbsp;模&nbsp;拟&nbsp;比&nbsp;较&nbsp;器&nbsp;<br>的&nbsp;状&nbsp;态&nbsp;所&nbsp;触&nbsp;发&nbsp;的&nbsp;模&nbsp;拟&nbsp;开&nbsp;关。&nbsp;模&nbsp;拟&nbsp;比&nbsp;较&nbsp;器&nbsp;状&nbsp;态&nbsp;的&nbsp;时&nbsp;钟&nbsp;速&nbsp;率&nbsp;远&nbsp;<br>大&nbsp;于A/D&nbsp;变&nbsp;换&nbsp;器&nbsp;的&nbsp;变&nbsp;换&nbsp;速&nbsp;率。&nbsp;比&nbsp;较&nbsp;器&nbsp;的&nbsp;时&nbsp;钟&nbsp;速&nbsp;率&nbsp;等&nbsp;于&nbsp;过&nbsp;取&nbsp;样&nbsp;<br>频&nbsp;率。&nbsp;输&nbsp;出&nbsp;变&nbsp;换&nbsp;速&nbsp;率&nbsp;与&nbsp;过&nbsp;取&nbsp;样&nbsp;率&nbsp;之&nbsp;比&nbsp;表&nbsp;示&nbsp;所&nbsp;选&nbsp;∑&nbsp;Δ&nbsp;变&nbsp;换&nbsp;器&nbsp;<br>的&nbsp;效&nbsp;率。1&nbsp;位&nbsp;比&nbsp;较&nbsp;器&nbsp;的&nbsp;开&nbsp;关&nbsp;速&nbsp;率&nbsp;可&nbsp;认&nbsp;为&nbsp;在&nbsp;一&nbsp;高&nbsp;频&nbsp;上&nbsp;调&nbsp;制&nbsp;或&nbsp;斩&nbsp;<br>波&nbsp;输&nbsp;入&nbsp;信&nbsp;号。&nbsp;用&nbsp;这&nbsp;种&nbsp;方&nbsp;法&nbsp;调&nbsp;制&nbsp;信&nbsp;号&nbsp;和&nbsp;噪&nbsp;声&nbsp;把&nbsp;噪&nbsp;声&nbsp;分&nbsp;量&nbsp;移&nbsp;至&nbsp;<br>频&nbsp;率&nbsp;之&nbsp;上&nbsp;和A/D&nbsp;变&nbsp;换&nbsp;器&nbsp;的&nbsp;带&nbsp;宽&nbsp;之&nbsp;外。&nbsp;<br><br><br>----&nbsp;高&nbsp;分&nbsp;辩&nbsp;率A/D&nbsp;变&nbsp;换&nbsp;器&nbsp;依&nbsp;靠&nbsp;∑&nbsp;Δ&nbsp;调&nbsp;制&nbsp;来&nbsp;改&nbsp;善&nbsp;模&nbsp;拟&nbsp;输&nbsp;入&nbsp;信&nbsp;号&nbsp;<br>的&nbsp;信&nbsp;噪&nbsp;比（SNR）。SNR&nbsp;的&nbsp;改&nbsp;善&nbsp;是&nbsp;过&nbsp;取&nbsp;样&nbsp;率（Kfs）&nbsp;和&nbsp;做&nbsp;为&nbsp;解&nbsp;调&nbsp;器&nbsp;<br>的&nbsp;数&nbsp;字&nbsp;滤&nbsp;波&nbsp;器&nbsp;带&nbsp;宽&nbsp;变&nbsp;化&nbsp;的&nbsp;函&nbsp;数。&nbsp;<br><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;202.120.8.11]<br></tr></table><br><caption align=bottom><hr><table align=center cellspacing=1 class=foot><tr><td class=foot><a href="a-3.htm">返回</tr></table><p class=copyr align=center>Copyright &copy; 2001 <a class=copyr href="http://bbs.sjtu.edu.cn">SJTUBBS</a>, All Rights Reserved.<br><br>版权所有<a class=copyr href="telnet://bbs.sjtu.edu.cn">上海交大BBS饮水思源站</a></caption></body></html>

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