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<span class="path"><a href="index.html">FOSSEE Signal Processing Toolbox</a> >> <a href="section_be19baaac84b122b8ad501d34462f5bf.html">FOSSEE Signal Processing Toolbox</a> > firpmord</span>
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<div class="refnamediv"><h1 class="refname">firpmord</h1>
<p class="refpurpose">Parks-McClennan optimal FIR filter order estimation</p></div>
<div class="refsynopsisdiv"><h3 class="title">Calling Sequence</h3>
<div class="synopsis"><pre></pre></div></div>
<div class="refsection"><h3 class="title">Parameters</h3>
<dl><dt><span class="term">f:</span>
<dd><p class="para">double - positive - vector</p></dd></dt>
<dt><span class="term">a:</span>
<dd><p class="para">double - positive - vector</p></dd></dt>
<dt><span class="term">dev:</span>
<dd><p class="para">double - positive - vector</p></dd></dt>
<dt><span class="term">n:</span>
<dd><p class="para">int - scalar</p></dd></dt>
<dt><span class="term">fo:</span>
<dd><p class="para">double - positive - vector</p></dd></dt>
<dt><span class="term">ao:</span>
<dd><p class="para">double - positive - vector</p></dd></dt>
<dt><span class="term">w:</span>
<dd><p class="para">double - vector</p></dd></dt></dl></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="scilabnumber">1</span><span class="scilabopenclose">]</span> <span class="scilabid">A</span> <span class="scilabid">low</span><span class="scilaboperator">-</span><span class="scilabid">pass</span> <a class="scilabmacro" href="scilab://filter">filter</a>
<span class="scilabid">f</span> <span class="scilaboperator">=</span> <span class="scilabopenclose">[</span><span class="scilabnumber">1500</span> <span class="scilabnumber">2000</span><span class="scilabopenclose">]</span><span class="scilabdefault">;</span> <span class="scilabcomment">// frequency edges for bands</span>
<span class="scilabid">a</span> <span class="scilaboperator">=</span> <span class="scilabopenclose">[</span><span class="scilabnumber">1</span> <span class="scilabnumber">0</span><span class="scilabopenclose">]</span><span class="scilabdefault">;</span> <span class="scilabcomment">// desired amplitude for each band</span>
<span class="scilabid">dev</span> <span class="scilaboperator">=</span> <span class="scilabopenclose">[</span><span class="scilabnumber">0.01</span> <span class="scilabnumber">0.1</span><span class="scilabopenclose">]</span><span class="scilabdefault">;</span> <span class="scilabcomment">// Acceptable deviation for each band</span>
<span class="scilabid">fs</span> <span class="scilaboperator">=</span> <span class="scilabnumber">8000</span><span class="scilabdefault">;</span> <span class="scilabcomment">// Sampling frequency</span>
<span class="scilabopenclose">[</span><span class="scilabid">n</span><span class="scilabdefault">,</span><span class="scilabid">fo</span><span class="scilabdefault">,</span><span class="scilabid">ao</span><span class="scilabdefault">,</span><span class="scilabid">w</span><span class="scilabopenclose">]</span> <span class="scilaboperator">=</span> <span class="scilabid">firpmord</span><span class="scilabopenclose">(</span><span class="scilabid">f</span><span class="scilabdefault">,</span><span class="scilabid">a</span><span class="scilabdefault">,</span><span class="scilabid">dev</span><span class="scilabdefault">,</span><span class="scilabid">fs</span><span class="scilabopenclose">)</span><span class="scilabdefault">;</span>
<span class="scilabopenclose">[</span><span class="scilabnumber">2</span><span class="scilabopenclose">]</span> <span class="scilabid">A</span> <span class="scilabid">bandstop</span> <a class="scilabmacro" href="scilab://filter">filter</a>
<span class="scilabid">f</span> <span class="scilaboperator">=</span> <span class="scilabopenclose">[</span><span class="scilabnumber">1000</span> <span class="scilabnumber">1800</span> <span class="scilabnumber">2400</span> <span class="scilabnumber">3000</span><span class="scilabopenclose">]</span><span class="scilabdefault">;</span>
<span class="scilabid">a</span> <span class="scilaboperator">=</span> <span class="scilabopenclose">[</span><span class="scilabnumber">1</span> <span class="scilabnumber">0</span> <span class="scilabnumber">0.5</span><span class="scilabopenclose">]</span><span class="scilabdefault">;</span>
<span class="scilabid">dev</span> <span class="scilaboperator">=</span> <span class="scilabopenclose">[</span><span class="scilabnumber">0.01</span> <span class="scilabnumber">0.1</span> <span class="scilabnumber">0.03</span><span class="scilabopenclose">]</span><span class="scilabdefault">;</span>
<span class="scilabid">fs</span> <span class="scilaboperator">=</span> <span class="scilabnumber">8000</span><span class="scilabdefault">;</span>
<span class="scilabopenclose">[</span><span class="scilabid">n</span><span class="scilabdefault">,</span><span class="scilabid">fo</span><span class="scilabdefault">,</span><span class="scilabid">ao</span><span class="scilabdefault">,</span><span class="scilabid">w</span><span class="scilabopenclose">]</span> <span class="scilaboperator">=</span> <span class="scilabid">firpmord</span><span class="scilabopenclose">(</span><span class="scilabid">f</span><span class="scilabdefault">,</span><span class="scilabid">a</span><span class="scilabdefault">,</span><span class="scilabid">dev</span><span class="scilabdefault">,</span><span class="scilabid">fs</span><span class="scilabopenclose">)</span><span class="scilabdefault">;</span>
<span class="scilabid">References</span>
<span class="scilabopenclose">[</span><span class="scilabnumber">1</span><span class="scilabopenclose">]</span> <span class="scilabid">Rabiner</span><span class="scilabdefault">,</span> <span class="scilabid">Lawrence</span> <span class="scilabid">R</span><span class="scilaboperator">.</span><span class="scilabdefault">,</span> <a class="scilabcommand" href="scilab://and">and</a> <span class="scilabstring">Bernard</span> <span class="scilabstring">Gold.</span> <span class="scilabstring">"Theory</span> <span class="scilabstring">and</span> <span class="scilabstring">application</span> <span class="scilabstring">of</span>
<span class="scilabid">digital</span> <span class="scilabid">signal</span> <span class="scilabid">processing</span><span class="scilaboperator">.</span><span class="scilabstring">"</span><span class="scilabstring"> Englewood Cliffs, NJ, Prentice-Hall, Inc.,</span>
<span class="scilabnumber">1975.</span> <span class="scilabnumber">777</span> <span class="scilabid">p</span><span class="scilaboperator">.</span> <span class="scilabnumber">156</span><span class="scilaboperator">-</span><span class="scilabnumber">7</span> <span class="scilabopenclose">(</span><span class="scilabnumber">1975</span><span class="scilabopenclose">)</span><span class="scilaboperator">.</span>
<span class="scilabopenclose">[</span><span class="scilabnumber">2</span><span class="scilabopenclose">]</span> <span class="scilabid">Rabiner</span><span class="scilabdefault">,</span> <span class="scilabid">Lawrence</span> <span class="scilabid">R</span><span class="scilaboperator">.</span><span class="scilabdefault">,</span> <a class="scilabcommand" href="scilab://and">and</a> <span class="scilabstring">Otto</span> <span class="scilabstring">Herrmann.</span> <span class="scilabstring">"The</span> <span class="scilabstring">predictability</span> <span class="scilabstring">of</span> <span class="scilabstring">certain</span>
<span class="scilabid">optimum</span> <span class="scilabid">finite</span><span class="scilaboperator">-</span><span class="scilabid">impulse</span><span class="scilaboperator">-</span><span class="scilabid">response</span> <span class="scilabid">digital</span> <span class="scilabid">filters</span><span class="scilaboperator">.</span><span class="scilabstring">"</span><span class="scilabstring"> Circuit Theory,</span>
<span class="scilabid">IEEE</span> <span class="scilabid">Transactions</span> <span class="scilabid">on</span> <span class="scilabnumber">20.4</span> <span class="scilabopenclose">(</span><span class="scilabnumber">1973</span><span class="scilabopenclose">)</span><span class="scilabspecial">:</span> <span class="scilabnumber">401</span><span class="scilaboperator">-</span><span class="scilabnumber">408.</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>
<div class="refsection"><h3 class="title">Authors</h3>
<ul class="itemizedlist"><li class="member">Ayush Baid</li></ul></div>
<div class="refsection"><h3 class="title">See also</h3>
<ul class="itemizedlist"></ul></div>
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