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<span class="path"><a href="index.html">FOSSEE Signal Processing Toolbox</a> >> <a href="section_e54aa8aac34aa55341e8b4b782fe1a74.html">FOSSEE Signal Processing Toolbox</a> > invimpinvar</span>
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<div class="refnamediv"><h1 class="refname">invimpinvar</h1>
<p class="refpurpose">This function converts digital filter with coefficients b and a to analog, conserving impulse response.</p></div>
<div class="refsynopsisdiv"><h3 class="title">Calling Sequence</h3>
<div class="synopsis"><pre><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">impinvar</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">b</span><span class="default">, </span><span class="default">a</span><span class="default">] = </span><span class="default">impinvar</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">fs</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="default">impinvar</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">fs</span><span class="default">, </span><span class="default">tol</span><span class="default">)</span></pre></div></div>
<div class="refsection"><h3 class="title">Parameters</h3>
<dl><dt><span class="term">b:</span>
<dd><p class="para">real or complex valued scalar or vector</p></dd></dt>
<dt><span class="term">a:</span>
<dd><p class="para">real or complex valued scalar or vector, order should be greater than b</p></dd></dt>
<dt><span class="term">fs:</span>
<dd><p class="para">real or complex value, default value 1Hz</p></dd></dt>
<dt><span class="term">tol:</span>
<dd><p class="para">real or complex value, default value 0.0001</p></dd></dt></dl></div>
<div class="refsection"><h3 class="title">Description</h3>
<p class="para">This is an Octave function.
This function converts digital filter with coefficients b and a to analog, conserving impulse response.
This function does the inverse of impinvar.</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">b</span> <span class="scilaboperator">=</span> <span class="scilabnumber">0.0081000</span>
<span class="scilabid">a</span> <span class="scilaboperator">=</span> <span class="scilabopenclose">[</span><span class="scilabnumber">2.0000000</span><span class="scilabdefault">,</span> <span class="scilabnumber">0.56435378</span><span class="scilabdefault">,</span> <span class="scilabnumber">0.4572792</span><span class="scilabdefault">,</span> <span class="scilabnumber">0.00705544</span><span class="scilabdefault">,</span> <span class="scilabnumber">0.091000</span><span class="scilabopenclose">]</span>
<span class="scilabopenclose">[</span><span class="scilabid">ay</span><span class="scilabdefault">,</span> <span class="scilabid">by</span><span class="scilabopenclose">]</span> <span class="scilaboperator">=</span> <span class="scilabid">invimpinvar</span><span class="scilabopenclose">(</span><span class="scilabid">b</span><span class="scilabdefault">,</span><span class="scilabid">a</span><span class="scilabdefault">,</span><span class="scilabnumber">10</span><span class="scilabopenclose">)</span>
<span class="scilabid">ay</span> <span class="scilaboperator">=</span>
<span class="scilaboperator">-</span><span class="scilabnumber">1.6940e-16</span> <span class="scilabnumber">4.6223e+00</span> <span class="scilaboperator">-</span><span class="scilabnumber">4.5210e+00</span> <span class="scilabnumber">7.2880e+02</span>
<span class="scilabid">by</span> <span class="scilaboperator">=</span>
<span class="scilabid">Columns</span> <span class="scilabnumber">1</span> <span class="scilabid">through</span> <span class="scilabnumber">4</span><span class="scilabspecial">:</span>
<span class="scilabnumber">1.0000e+00</span> <span class="scilabnumber">3.0900e+01</span> <span class="scilabnumber">9.6532e+02</span> <span class="scilabnumber">1.2232e+04</span>
<span class="scilabid">Column</span> <span class="scilabnumber">5</span><span class="scilabspecial">:</span>
<span class="scilabnumber">1.1038e+05</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>
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