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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> > cl2bp</span>
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<div class="refnamediv"><h1 class="refname">cl2bp</h1>
<p class="refpurpose">Constrained L2 bandpass FIR filter design.</p></div>
<div class="refsynopsisdiv"><h3 class="title">Calling Sequence</h3>
<div class="synopsis"><pre><span class="default">h</span><span class="default"> = </span><span class="functionid">cl2bp</span><span class="default"> (</span><span class="default">m</span><span class="default">, </span><span class="default">w1</span><span class="default">, </span><span class="default">w2</span><span class="default">, </span><span class="default">up</span><span class="default">, </span><span class="default">lo</span><span class="default">, </span><span class="default">gridsize</span><span class="default">)</span>
<span class="default">h</span><span class="default"> = </span><span class="functionid">cl2bp</span><span class="default"> (</span><span class="default">m</span><span class="default">, </span><span class="default">w1</span><span class="default">, </span><span class="default">w2</span><span class="default">, </span><span class="default">up</span><span class="default">, </span><span class="default">lo</span><span class="default">)</span></pre></div></div>
<div class="refsection"><h3 class="title">Parameters</h3>
<dl><dt><span class="term">m:</span>
<dd><p class="para">degree of cosine polynomial, i.e. the number of output coefficients will be m*2+1</p></dd></dt>
<dt><span class="term">w1 and w2:</span>
<dd><p class="para">bandpass filter cutoffs in the range 0 <= w1 < w2 <= pi, where pi is the Nyquist frequency</p></dd></dt>
<dt><span class="term">up:</span>
<dd><p class="para">vector of 3 upper bounds for [stopband1, passband, stopband2]</p></dd></dt>
<dt><span class="term">lo:</span>
<dd><p class="para">vector of 3 lower bounds for [stopband1, passband, stopband2]</p></dd></dt>
<dt><span class="term">gridsize:</span>
<dd><p class="para">search grid size; larger values may improve accuracy, but greatly increase calculation time.</p></dd></dt></dl></div>
<div class="refsection"><h3 class="title">Description</h3>
<p class="para">This is an Octave function.
Constrained L2 bandpass FIR filter design. Compared to remez, it offers implicit specification of transition bands, a higher likelihood of convergence, and an error criterion combining features of both L2 and Chebyshev approaches.</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">cl2bp</span><span class="scilabopenclose">(</span><span class="scilabnumber">5</span><span class="scilabdefault">,</span> <span class="scilabnumber">0.3</span><span class="scilaboperator">*</span><span class="scilabid">pi</span><span class="scilabdefault">,</span> <span class="scilabnumber">0.6</span><span class="scilaboperator">*</span><span class="scilabid">pi</span><span class="scilabdefault">,</span> <span class="scilabopenclose">[</span><span class="scilabnumber">0.02</span><span class="scilabdefault">,</span> <span class="scilabnumber">1.02</span><span class="scilabdefault">,</span> <span class="scilabnumber">0.02</span><span class="scilabopenclose">]</span><span class="scilabdefault">,</span> <span class="scilabopenclose">[</span><span class="scilaboperator">-</span><span class="scilabnumber">0.02</span><span class="scilabdefault">,</span> <span class="scilabnumber">0.98</span><span class="scilabdefault">,</span> <span class="scilaboperator">-</span><span class="scilabnumber">0.02</span><span class="scilabopenclose">]</span><span class="scilabdefault">,</span> <span class="scilabnumber">2</span><span class="scilaboperator">^</span><span class="scilabnumber">11</span><span class="scilabopenclose">)</span>
<span class="scilabid">h</span> <span class="scilaboperator">=</span>
<span class="scilabnumber">0.038311</span>
<span class="scilabnumber">0.082289</span>
<span class="scilaboperator">-</span><span class="scilabnumber">0.086163</span>
<span class="scilaboperator">-</span><span class="scilabnumber">0.226006</span>
<span class="scilabnumber">0.047851</span>
<span class="scilabnumber">0.307434</span>
<span class="scilabnumber">0.047851</span>
<span class="scilaboperator">-</span><span class="scilabnumber">0.226006</span>
<span class="scilaboperator">-</span><span class="scilabnumber">0.086163</span>
<span class="scilabnumber">0.082289</span>
<span class="scilabnumber">0.038311</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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