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diff --git a/help/en_US/scilab_en_US_help/butter.html b/help/en_US/scilab_en_US_help/butter.html new file mode 100644 index 0000000..45a9f9e --- /dev/null +++ b/help/en_US/scilab_en_US_help/butter.html @@ -0,0 +1,92 @@ +<html><head> + <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> + <title>butter</title> + <style type="text/css" media="all"> + @import url("scilab_code.css"); + @import url("xml_code.css"); + @import url("c_code.css"); + @import url("style.css"); + </style> + </head> + <body> + <div class="manualnavbar"> + <table width="100%"><tr> + <td width="30%"> + <span class="previous"><a href="buffer.html"><< buffer</a></span> + + </td> + <td width="40%" class="center"> + <span class="top"><a href="section_be19baaac84b122b8ad501d34462f5bf.html">FOSSEE Signal Processing Toolbox</a></span> + + </td> + <td width="30%" class="next"> + <span class="next"><a href="buttord.html">buttord >></a></span> + + </td> + </tr></table> + <hr /> + </div> + + + + <span class="path"><a href="index.html">FOSSEE Signal Processing Toolbox</a> >> <a href="section_be19baaac84b122b8ad501d34462f5bf.html">FOSSEE Signal Processing Toolbox</a> > butter</span> + + <br /><br /> + <div class="refnamediv"><h1 class="refname">butter</h1> + <p class="refpurpose">This function generates a Butterworth filter.</p></div> + + +<div class="refsynopsisdiv"><h3 class="title">Calling Sequence</h3> + <div class="synopsis"><pre><span class="default">[</span><span class="default">a</span><span class="default">, </span><span class="default">b</span><span class="default">] = </span><span class="functionid">butter</span><span class="default"> (</span><span class="default">n</span><span class="default">, </span><span class="default">w</span><span class="default">)</span> +<span class="default">[</span><span class="default">a</span><span class="default">, </span><span class="default">b</span><span class="default">] = </span><span class="functionid">butter</span><span class="default"> (</span><span class="default">n</span><span class="default">, </span><span class="default">w</span><span class="default">, </span>"<span class="default">high</span>"<span class="default">)</span> +<span class="default">[</span><span class="default">a</span><span class="default">, </span><span class="default">b</span><span class="default">] = </span><span class="functionid">butter</span><span class="default"> (</span><span class="default">n</span><span class="default">, [</span><span class="default">wl</span><span class="default">, </span><span class="default">wh</span><span class="default">])</span> +<span class="default">[</span><span class="default">b</span><span class="default">, </span><span class="default">a</span><span class="default">] = </span><span class="functionid">butter</span><span class="default"> (</span><span class="default">n</span><span class="default">, [</span><span class="default">wl</span><span class="default">, </span><span class="default">wh</span><span class="default">], </span>"<span class="default">stop</span>"<span class="default">)</span> +<span class="default">[</span><span class="default">a</span><span class="default">, </span><span class="default">b</span><span class="default">, </span><span class="default">c</span><span class="default">] = </span><span class="functionid">butter</span><span class="default"> (…)</span> +<span class="default">[</span><span class="default">a</span><span class="default">, </span><span class="default">b</span><span class="default">, </span><span class="default">c</span><span class="default">, </span><span class="default">d</span><span class="default">] = </span><span class="functionid">butter</span><span class="default"> (…)</span> +<span class="default">[…] = </span><span class="functionid">butter</span><span class="default"> (…, </span>"<span class="default">s</span>"<span class="default">)</span></pre></div></div> + +<div class="refsection"><h3 class="title">Parameters</h3> + <dl><dt><span class="term">n:</span> + <dd><p class="para">positive integer value</p></dd></dt> + <dt><span class="term">w:</span> + <dd><p class="para">positive real value, w in the range [0,1]</p></dd></dt></dl></div> + +<div class="refsection"><h3 class="title">Description</h3> + <p class="para">This is an Octave function. +This function generates a Butterworth filter. Default is a discrete space (Z) filter. +The third parameter takes in low or high, default value is low. The cutoff is pi*Wc radians. +[b,a] = butter(n, [Wl, Wh]) indicates a band pass filter with edges pi*Wl and pi*Wh radians. +[b,a] = butter(n, [Wl, Wh], ’stop’) indicates a band reject filter with edges pi*Wl and pi*Wh radians. +[z,p,g] = butter(...) returns filter as zero-pole-gain rather than coefficients of the numerator and denominator polynomials. +[...] = butter(...,’s’) returns a Laplace space filter, w can be larger than 1. +[a,b,c,d] = butter(...) returns state-space matrices.</p></div> + +<div class="refsection"><h3 class="title">Examples</h3> + <div class="programlisting"><table border="0" width="100%"><tr><td width="98%"><pre class="scilabcode"><span class="scilabopenclose">[</span><span class="scilabid">a</span><span class="scilabdefault">,</span><span class="scilabid">b</span><span class="scilabopenclose">]</span><span class="scilaboperator">=</span><span class="scilabid">butter</span><span class="scilabopenclose">(</span><span class="scilabnumber">3</span><span class="scilabdefault">,</span> <span class="scilabnumber">0.7</span><span class="scilabopenclose">)</span> +<span class="scilabid">a</span> <span class="scilaboperator">=</span> +<span class="scilabnumber">0.37445</span> <span class="scilabnumber">1.12336</span> <span class="scilabnumber">1.12336</span> <span class="scilabnumber">0.37445</span> +<span class="scilabid">b</span> <span class="scilaboperator">=</span> +<span class="scilabnumber">1.00000</span> <span class="scilabnumber">1.16192</span> <span class="scilabnumber">0.69594</span> <span class="scilabnumber">0.13776</span></pre></td><td valign="top"><a href="scilab://scilab.execexample/"><img src="ScilabExecute.png" border="0"/></a></td><td valign="top"><a href="scilab://scilab.editexample/"><img src="ScilabEdit.png" border="0"/></a></td><td></td></tr></table></div></div> + <br /> + + <div class="manualnavbar"> + <table width="100%"> + <tr><td colspan="3" class="next"><a href="http://bugzilla.scilab.org/enter_bug.cgi?product=Scilab%20software&component=Documentation%20pages" class="ulink">Report an issue</a></td></tr> +<tr> + <td width="30%"> + <span class="previous"><a href="buffer.html"><< buffer</a></span> + + </td> + <td width="40%" class="center"> + <span class="top"><a href="section_be19baaac84b122b8ad501d34462f5bf.html">FOSSEE Signal Processing Toolbox</a></span> + + </td> + <td width="30%" class="next"> + <span class="next"><a href="buttord.html">buttord >></a></span> + + </td> + </tr></table> + <hr /> + </div> + </body> +</html> |