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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> > cheb1ap</span>
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<div class="refnamediv"><h1 class="refname">cheb1ap</h1>
<p class="refpurpose">This function designs a lowpass analog Chebyshev type I filter.</p></div>
<div class="refsynopsisdiv"><h3 class="title">Calling Sequence</h3>
<div class="synopsis"><pre><span class="default">[</span><span class="default">z</span><span class="default">, </span><span class="default">p</span><span class="default">, </span><span class="default">g</span><span class="default">] = </span><span class="functionid">cheb1ap</span><span class="default"> (</span><span class="default">n</span><span class="default">, </span><span class="default">Rp</span><span class="default">)</span>
<span class="default">[</span><span class="default">z</span><span class="default">, </span><span class="default">p</span><span class="default">] = </span><span class="functionid">cheb1ap</span><span class="default"> (</span><span class="default">n</span><span class="default">, </span><span class="default">Rp</span><span class="default">)</span>
<span class="default">p</span><span class="default"> = </span><span class="functionid">cheb1ap</span><span class="default"> (</span><span class="default">n</span><span class="default">, </span><span class="default">Rp</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">Filter Order</p></dd></dt>
<dt><span class="term">Rp:</span>
<dd><p class="para">Peak-to-peak passband ripple</p></dd></dt>
<dt><span class="term">z:</span>
<dd><p class="para">Zeros</p></dd></dt>
<dt><span class="term">p:</span>
<dd><p class="para">Poles</p></dd></dt>
<dt><span class="term">g:</span>
<dd><p class="para">Gain</p></dd></dt></dl></div>
<div class="refsection"><h3 class="title">Description</h3>
<p class="para">This is an Octave function.
It designs a lowpass analog Chebyshev type I filter of nth order and with a Peak-to-peak passband ripple of Rp.</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">z</span><span class="scilabdefault">,</span> <span class="scilabid">p</span><span class="scilabdefault">,</span> <span class="scilabid">g</span><span class="scilabopenclose">]</span> <span class="scilaboperator">=</span> <span class="scilabid">cheb1ap</span> <span class="scilabopenclose">(</span><span class="scilabnumber">10</span><span class="scilabdefault">,</span> <span class="scilabnumber">20</span><span class="scilabopenclose">)</span>
<span class="scilabid">z</span> <span class="scilaboperator">=</span> <span class="scilabopenclose">[</span><span class="scilabopenclose">]</span><span class="scilabopenclose">(</span><span class="scilabnumber">0</span><span class="scilabid">x0</span><span class="scilabopenclose">)</span>
<span class="scilabid">p</span> <span class="scilaboperator">=</span>
<span class="scilabid">Columns</span> <span class="scilabnumber">1</span> <span class="scilabid">through</span> <span class="scilabnumber">6</span><span class="scilabspecial">:</span>
<span class="scilaboperator">-</span><span class="scilabnumber">0.00157</span> <span class="scilaboperator">-</span> <span class="scilabnumber">0.98774</span><span class="scilabid">i</span> <span class="scilaboperator">-</span><span class="scilabnumber">0.00456</span> <span class="scilaboperator">-</span> <span class="scilabnumber">0.89105</span><span class="scilabid">i</span> <span class="scilaboperator">-</span><span class="scilabnumber">0.00709</span> <span class="scilaboperator">-</span> <span class="scilabnumber">0.70714</span><span class="scilabid">i</span> <span class="scilaboperator">-</span><span class="scilabnumber">0.00894</span> <span class="scilaboperator">-</span> <span class="scilabnumber">0.45401</span><span class="scilabid">i</span> <span class="scilaboperator">-</span><span class="scilabnumber">0.00991</span> <span class="scilaboperator">-</span> <span class="scilabnumber">0.15644</span><span class="scilabid">i</span> <span class="scilaboperator">-</span><span class="scilabnumber">0.00991</span> <span class="scilaboperator">+</span> <span class="scilabnumber">0.15644</span><span class="scilabid">i</span>
<span class="scilabid">Columns</span> <span class="scilabnumber">7</span> <span class="scilabid">through</span> <span class="scilabnumber">10</span><span class="scilabspecial">:</span>
<span class="scilaboperator">-</span><span class="scilabnumber">0.00894</span> <span class="scilaboperator">+</span> <span class="scilabnumber">0.45401</span><span class="scilabid">i</span> <span class="scilaboperator">-</span><span class="scilabnumber">0.00709</span> <span class="scilaboperator">+</span> <span class="scilabnumber">0.70714</span><span class="scilabid">i</span> <span class="scilaboperator">-</span><span class="scilabnumber">0.00456</span> <span class="scilaboperator">+</span> <span class="scilabnumber">0.89105</span><span class="scilabid">i</span> <span class="scilaboperator">-</span><span class="scilabnumber">0.00157</span> <span class="scilaboperator">+</span> <span class="scilabnumber">0.98774</span><span class="scilabid">i</span>
<span class="scilabid">g</span> <span class="scilaboperator">=</span> <span class="scilabnumber">1.9630e-04</span> <span class="scilaboperator">-</span> <span class="scilabnumber">6.3527e-22</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>
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