# 理想滤波器参考代码.zip

• mynameniubi
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• 2021-04-08 20:22
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1理想过滤函数名：idealfilter 2函数：将待滤波信号的FFT变换结果（即待滤波信号的频谱）作为输入参数发送给理想滤波函数，该函数对输入的FFT变换结果进行理想低通或带通滤波，输出滤波后的频谱。

• 理想滤波器参考代码
• IdealFilter_Example.m
3.1KB
• 理想滤波器函数的使用方法.docx
32.9KB
• IdealFilter.m
1.2KB

<html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta charset="utf-8"> <meta name="generator" content="pdf2htmlEX"> <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"> <link rel="stylesheet" href="https://static.pudn.com/base/css/base.min.css"> <link rel="stylesheet" href="https://static.pudn.com/base/css/fancy.min.css"> <link rel="stylesheet" href="https://static.pudn.com/prod/directory_preview_static/6266a7e14c65f412593a7cf3/raw.css"> <script src="https://static.pudn.com/base/js/compatibility.min.js"></script> <script src="https://static.pudn.com/base/js/pdf2htmlEX.min.js"></script> <script> try{ pdf2htmlEX.defaultViewer = new pdf2htmlEX.Viewer({}); }catch(e){} </script> <title></title> </head> <body> <div id="sidebar" style="display: none"> <div id="outline"> </div> </div> <div id="pf1" class="pf w0 h0" data-page-no="1"><div class="pc pc1 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://static.pudn.com/prod/directory_preview_static/6266a7e14c65f412593a7cf3/bg1.jpg"><div class="c x0 y1 w2 h2"><div class="t m0 x1 h3 y2 ff1 fs0 fc0 sc0 ls0 ws0">1<span class="ff2">&#12289;&#29702;&#24819;&#28388;&#27874;&#22120;&#20989;&#25968;&#21517;&#65306;</span>IdealFilter</div><div class="t m0 x1 h3 y3 ff1 fs0 fc0 sc0 ls0 ws0">2<span class="_ _0"></span><span class="ff2">&#12289;<span class="_ _0"></span>&#20316;<span class="_ _0"></span>&#29992;<span class="_ _0"></span>&#65306;<span class="_ _0"></span>&#23558;<span class="_ _0"></span>&#24453;<span class="_ _1"></span>&#28388;<span class="_ _0"></span>&#27874;<span class="_ _1"></span>&#20449;<span class="_ _0"></span>&#21495;<span class="_ _0"></span>&#30340;<span class="_ _2"> </span></span>FFT<span class="_ _3"> </span><span class="ff2">&#21464;<span class="_ _1"></span>&#25442;<span class="_ _0"></span>&#32467;<span class="_ _0"></span>&#26524;<span class="_ _0"></span>&#65288;<span class="_ _0"></span>&#21363;<span class="_ _0"></span>&#24453;<span class="_ _1"></span>&#28388;<span class="_ _0"></span>&#27874;<span class="_ _0"></span>&#20449;<span class="_ _0"></span>&#21495;<span class="_ _0"></span>&#30340;<span class="_ _0"></span>&#39057;<span class="_ _1"></span>&#35889;<span class="_ _0"></span>&#65289;<span class="_ _0"></span>&#20316;<span class="_ _0"></span>&#20026;<span class="_ _0"></span>&#36755;<span class="_ _0"></span>&#20837;<span class="_ _1"></span>&#21442;<span class="_ _0"></span>&#25968;<span class="_ _0"></span>&#36865;<span class="_ _0"></span>&#32473;</span></div><div class="t m0 x1 h3 y4 ff1 fs0 fc0 sc0 ls0 ws0">IdealFilter<span class="_"> </span><span class="ff2">&#20989;&#25968;&#65292;&#30001;&#35813;<span class="_ _4"></span>&#20989;&#25968;&#23545;<span class="_ _4"></span>&#36755;&#20837;&#30340;<span class="_ _3"> </span></span>FFT<span class="_ _5"> </span><span class="ff2">&#21464;&#25442;&#32467;<span class="_ _4"></span>&#26524;&#36827;&#34892;<span class="_ _4"></span>&#29702;&#24819;&#20302;<span class="_ _4"></span>&#36890;&#25110;&#24102;<span class="_ _4"></span>&#36890;&#28388;&#27874;<span class="_ _4"></span>&#65292;&#36755;&#20986;&#28388;<span class="_ _4"></span>&#27874;&#21518;&#30340;</span></div><div class="t m0 x1 h3 y5 ff2 fs0 fc0 sc0 ls0 ws0">&#39057;&#35889;&#12290;</div><div class="t m0 x1 h3 y6 ff1 fs0 fc0 sc0 ls0 ws0">3<span class="ff2">&#12289;&#21442;&#25968;&#35828;&#26126;&#65306;</span></div><div class="t m0 x1 h4 y7 ff1 fs0 fc0 sc0 ls0 ws0">func&#58898;on [f<span class="_ _6"></span>,spf] = IdealFilter(<span class="_ _7"></span>N,Fs,fpass,fs<span class="_ _6"></span>top,fx)</div><div class="t m0 x1 h4 y8 ff1 fs0 fc0 sc0 ls0 ws0">% ---------------------------------------------------------<span class="_ _4"></span>----------------</div><div class="t m0 x1 h3 y9 ff1 fs0 fc0 sc0 ls0 ws0">% <span class="ff2">&#36755;&#20837;&#21442;&#25968;&#65306;</span></div><div class="t m0 x1 h3 ya ff1 fs0 fc0 sc0 ls0 ws0">% N - <span class="ff2">&#36755;&#20837;&#30340;<span class="_ _5"> </span></span>FFT<span class="_"> </span><span class="ff2">&#21464;&#25442;&#32467;&#26524;&#38271;&#24230;</span></div><div class="t m0 x1 h3 yb ff1 fs0 fc0 sc0 ls0 ws0">% Fs - <span class="ff2">&#37319;&#26679;&#39057;&#29575;&#65288;</span>Ny<span class="_ _7"></span>quist<span class="_ _5"> </span><span class="ff2">&#39057;&#29575;&#20026;&#37319;&#26679;&#39057;&#29575;&#30340;&#19968;&#21322;&#65289;</span></div><div class="t m0 x1 h3 yc ff1 fs0 fc0 sc0 ls0 ws0">% fpass - <span class="ff2">&#29702;&#24819;&#24102;&#36890;&#28388;&#27874;&#22120;&#36890;&#24102;&#36215;&#22987;&#39057;&#29575;&#65288;</span>fpass=0<span class="_"> </span><span class="ff2">&#21017;&#20026;&#29702;&#24819;&#20302;&#36890;&#28388;&#27874;&#65289;</span></div><div class="t m0 x1 h3 yd ff1 fs0 fc0 sc0 ls0 ws0">% fst<span class="_ _7"></span>op - <span class="ff2">&#29702;&#24819;&#24102;&#36890;&#28388;&#27874;&#22120;&#36890;&#24102;&#25130;&#27490;&#39057;&#29575;</span></div><div class="t m0 x1 h3 ye ff1 fs0 fc0 sc0 ls0 ws0">% fx - <span class="ff2">&#36755;&#20837;&#30340;&#26576;&#20010;&#26102;&#22495;&#20449;&#21495;&#30340;<span class="_ _5"> </span></span>FFT<span class="_"> </span><span class="ff2">&#21464;&#25442;&#32467;&#26524;&#65288;&#38271;&#24230;&#20026;<span class="_ _5"> </span></span>N<span class="ff2">&#65289;</span></div><div class="t m0 x1 h4 yf ff1 fs0 fc0 sc0 ls0 ws0">% ---------------------------------------------------------<span class="_ _4"></span>----------------</div><div class="t m0 x1 h3 y10 ff1 fs0 fc0 sc0 ls0 ws0">% <span class="ff2">&#36755;&#20986;&#21442;&#25968;&#65306;</span></div><div class="t m0 x1 h3 y11 ff1 fs0 fc0 sc0 ls0 ws0">% f - <span class="ff2">&#28388;&#27874;&#21518;&#30340;&#39057;&#29575;&#21521;&#37327;</span></div><div class="t m0 x1 h3 y12 ff1 fs0 fc0 sc0 ls0 ws0">% spf - <span class="ff2">&#29702;&#24819;&#20302;&#36890;</span>/<span class="ff2">&#24102;&#36890;&#28388;&#27874;&#21518;&#30340;<span class="_ _5"> </span></span>FFT<span class="_ _5"> </span><span class="ff2">&#21464;&#25442;&#65288;&#39057;&#35889;&#65292;&#21253;&#25324;&#24133;&#39057;&#21644;&#30456;&#39057;&#65289;</span></div><div class="t m0 x1 h4 y13 ff1 fs0 fc0 sc0 ls0 ws0">% ---------------------------------------------------------<span class="_ _4"></span>----------------</div><div class="t m0 x1 h3 y14 ff1 fs0 fc0 sc0 ls0 ws0">4<span class="ff2">&#12289;&#20351;&#29992;&#26041;&#27861;&#65306;&#35774;&#24453;&#28388;&#27874;&#20449;&#21495;&#20026;<span class="_ _5"> </span></span>st<span class="ff2">&#65292;&#37319;&#26679;&#39057;&#29575;&#20026;<span class="_ _5"> </span></span>Fs<span class="ff2">&#65292;</span>FFT<span class="_ _5"> </span><span class="ff2">&#21464;&#25442;&#30340;&#28857;&#25968;&#20026;<span class="_ _5"> </span></span>N</div><div class="t m0 x2 h3 y15 ff2 fs0 fc0 sc0 ls0 ws0">&#31532;&#19968;&#27493;&#65306;&#23545;&#20449;&#21495;<span class="_ _5"> </span><span class="ff1">st<span class="_ _5"> </span></span>&#36827;&#34892;<span class="_ _5"> </span><span class="ff1">N<span class="_"> </span></span>&#28857;<span class="_ _5"> </span><span class="ff1">FFT</span>&#65292;&#24471;&#21040;<span class="_ _5"> </span><span class="ff1">FFT<span class="_ _5"> </span></span>&#21464;&#25442;&#32467;&#26524;<span class="_ _5"> </span><span class="ff1">fst</span></div><div class="t m0 x2 h3 y16 ff2 fs0 fc0 sc0 ls0 ws0">&#31532;&#20108;&#27493;&#65306;&#30830;&#23450;&#36890;&#24102;&#36215;&#22987;&#39057;&#29575;<span class="_ _5"> </span><span class="ff1">fpass<span class="_"> </span></span>&#21644;&#36890;&#24102;&#25130;&#27490;&#39057;&#29575;<span class="_ _5"> </span><span class="ff1">fs<span class="_ _7"></span>top</span></div><div class="t m0 x2 h3 y17 ff2 fs0 fc0 sc0 ls0 ws0">&#31532;&#19977;&#27493;&#65306;&#20551;&#35774;&#28388;&#27874;&#36755;&#20986;&#30340;&#39057;&#35889;&#20026;<span class="_ _5"> </span><span class="ff1">fout</span>&#65292;&#35843;&#29992;&#29702;&#24819;&#28388;&#27874;&#20989;&#25968;&#65292;&#22914;&#19979;&#25152;&#31034;&#65306;</div><div class="t m0 x3 h4 y18 ff1 fs0 fc0 sc0 ls0 ws0">[f<span class="_ _6"></span>, fo<span class="_ _7"></span>ut] = IdealFilter(N,F<span class="_ _7"></span>s,fpass,fst<span class="_ _6"></span>op,fst)</div><div class="t m0 x2 h3 y19 ff2 fs0 fc0 sc0 ls0 ws0">&#31532;&#22235;&#27493;&#65306;&#23545;<span class="_ _5"> </span><span class="ff1">fout<span class="_ _5"> </span></span>&#20316;&#20613;&#31435;&#21494;&#21453;&#21464;&#25442;&#65292;&#24182;&#21462;&#23454;&#37096;&#65292;&#24471;&#21040;&#28388;&#27874;&#21518;&#30340;&#26102;&#22495;&#20449;&#21495;<span class="_ _5"> </span><span class="ff1">sout</span>&#65292;&#22914;&#19979;&#25152;&#31034;&#65306;</div><div class="t m0 x4 h4 y1a ff1 fs0 fc0 sc0 ls0 ws0">sout =real(i&amp;(f<span class="_ _7"></span>out))</div><div class="t m0 x2 h3 y1b ff2 fs0 fc0 sc0 ls0 ws0">&#20855;&#20307;&#20351;&#29992;&#26041;&#27861;&#21442;&#35265;&#31034;&#20363;&#20195;&#30721;&#65306;<span class="ff1">IdealFilter_Exa<span class="_ _7"></span>mple.m</span></div><div class="t m0 x2 h3 y1c ff2 fs0 fc1 sc1 ls0 ws0">&#27880;&#24847;&#65306;<span class="_ _4"></span>&#22312;&#33258;&#24049;<span class="_ _4"></span>&#30340;&#20195;&#30721;<span class="_ _4"></span>&#20013;&#20351;&#29992;<span class="_ _3"> </span><span class="ff3 sc0">IdealFilt<span class="_ _7"></span>er<span class="_ _5"> </span><span class="ff2 sc1">&#20989;<span class="_ _4"></span>&#25968;&#26102;&#65292;&#35201;<span class="_ _4"></span>&#23558;<span class="_ _8"> </span></span>IdealFilter<span class="_ _9"></span>.m<span class="_ _5"> </span><span class="ff2 sc1">&#25991;<span class="_ _4"></span>&#20214;&#25335;&#36125;<span class="_ _4"></span>&#21040;&#19982;&#33258;<span class="_ _4"></span>&#24049;&#20195;</span></span></div><div class="t m0 x1 h3 y1d ff2 fs0 fc1 sc1 ls0 ws0">&#30721;&#30456;&#21516;&#30340;&#36335;&#24452;&#19979;&#12290;</div></div></div><div class="pi" data-data='{"ctm":[1.611850,0.000000,0.000000,1.611850,0.000000,0.000000]}'></div></div> </body> </html>

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