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diff --git a/help/en_US/scilab_en_US_help/freqz.html b/help/en_US/scilab_en_US_help/freqz.html new file mode 100644 index 0000000..4e69678 --- /dev/null +++ b/help/en_US/scilab_en_US_help/freqz.html @@ -0,0 +1,92 @@ +<html><head> + <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> + <title>freqz</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="freqs.html"><< freqs</a></span> + + </td> + <td width="40%" class="center"> + <span class="top"><a href="section_cc2bc01c47967d47fcf3507a91d572ba.html">FOSSEE Signal Processing Toolbox</a></span> + + </td> + <td width="30%" class="next"> + <span class="next"><a href="fwhm.html">fwhm >></a></span> + + </td> + </tr></table> + <hr /> + </div> + + + + <span class="path"><a href="index.html">FOSSEE Signal Processing Toolbox</a> >> <a href="section_cc2bc01c47967d47fcf3507a91d572ba.html">FOSSEE Signal Processing Toolbox</a> > freqz</span> + + <br /><br /> + <div class="refnamediv"><h1 class="refname">freqz</h1> + <p class="refpurpose">This function returns the complex frequency response H of the rational IIR filter whose numerator and denominator coefficients are B and A, respectively.</p></div> + + +<div class="refsynopsisdiv"><h3 class="title">Calling Sequence</h3> + <div class="synopsis"><pre><span class="default">[</span><span class="default">H</span><span class="default">, </span><span class="default">W</span><span class="default">] = </span><span class="functionid">freqz</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="default">N</span><span class="default">, </span>"<span class="default">whole</span>"<span class="default">)</span> +<span class="default">[</span><span class="default">H</span><span class="default">, </span><span class="default">W</span><span class="default">] = </span><span class="functionid">freqz</span><span class="default">(</span><span class="default">B</span><span class="default">)</span> +<span class="default">[</span><span class="default">H</span><span class="default">, </span><span class="default">W</span><span class="default">] = </span><span class="functionid">freqz</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="default">[</span><span class="default">H</span><span class="default">, </span><span class="default">W</span><span class="default">] = </span><span class="functionid">freqz</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="default">N</span><span class="default">)</span> +<span class="default">H</span><span class="default"> = </span><span class="functionid">freqz</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="default">W</span><span class="default">)</span> +<span class="default">[</span><span class="default">H</span><span class="default">, </span><span class="default">W</span><span class="default">] = </span><span class="functionid">freqz</span><span class="default">(..., </span><span class="default">FS</span><span class="default">)</span> +<span class="functionid">freqz</span><span class="default">(...)</span></pre></div></div> + +<div class="refsection"><h3 class="title">Parameters</h3> + <dl><dt><span class="term">B, A, N:</span> + <dd><p class="para">Integer or Vector</p></dd></dt></dl></div> + +<div class="refsection"><h3 class="title">Description</h3> + <p class="para">Return the complex frequency response H of the rational IIR filter whose numerator and denominator coefficients are B and A, respectively.</p> + <p class="para">The response is evaluated at N angular frequencies between 0 and 2*pi.</p> + <p class="para">The output value W is a vector of the frequencies.</p> + <p class="para">If A is omitted, the denominator is assumed to be 1 (this corresponds to a simple FIR filter).</p> + <p class="para">If N is omitted, a value of 512 is assumed. For fastest computation, N should factor into a small number of small primes.</p> + <p class="para">If the fourth argument, "whole", is omitted the response is evaluated at frequencies between 0 and pi.</p> + <p class="para">'freqz (B, A, W)'</p> + <p class="para">Evaluate the response at the specific frequencies in the vector W. The values for W are measured in radians.</p> + <p class="para">'[...] = freqz (..., FS)'</p> + <p class="para">Return frequencies in Hz instead of radians assuming a sampling rate FS. If you are evaluating the response at specific frequencies W, those frequencies should be requested in Hz rather than radians.</p> + <p class="para">'freqz (...)'</p> + <p class="para">Plot the magnitude and phase response of H rather than returning them.</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="scilabid">H</span> <span class="scilaboperator">=</span> <span class="scilabid">freqz</span><span class="scilabopenclose">(</span><span class="scilabopenclose">[</span><span class="scilabnumber">1</span><span class="scilabdefault">,</span><span class="scilabnumber">2</span><span class="scilabdefault">,</span><span class="scilabnumber">3</span><span class="scilabopenclose">]</span><span class="scilabdefault">,</span> <span class="scilabopenclose">[</span><span class="scilabnumber">4</span><span class="scilabdefault">,</span><span class="scilabnumber">3</span><span class="scilabopenclose">]</span><span class="scilabdefault">,</span> <span class="scilabopenclose">[</span><span class="scilabnumber">1</span><span class="scilabdefault">,</span><span class="scilabnumber">2</span><span class="scilabdefault">,</span><span class="scilabnumber">5</span><span class="scilabopenclose">]</span><span class="scilabopenclose">)</span> +<span class="scilabid">ans</span> <span class="scilaboperator">=</span> +<span class="scilabnumber">0.4164716</span> <span class="scilaboperator">-</span> <span class="scilabnumber">0.5976772</span><span class="scilabid">i</span> <span class="scilaboperator">-</span> <span class="scilabnumber">0.4107690</span> <span class="scilaboperator">-</span> <span class="scilabnumber">0.2430335</span><span class="scilabid">i</span> <span class="scilabnumber">0.1761948</span> <span class="scilaboperator">+</span> <span class="scilabnumber">0.6273032</span><span class="scilabid">i</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="freqs.html"><< freqs</a></span> + + </td> + <td width="40%" class="center"> + <span class="top"><a href="section_cc2bc01c47967d47fcf3507a91d572ba.html">FOSSEE Signal Processing Toolbox</a></span> + + </td> + <td width="30%" class="next"> + <span class="next"><a href="fwhm.html">fwhm >></a></span> + + </td> + </tr></table> + <hr /> + </div> + </body> +</html> |