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<title>chirp</title>
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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> > chirp</span>
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<div class="refnamediv"><h1 class="refname">chirp</h1>
<p class="refpurpose">This function evaluates a chirp signal at time t.</p></div>
<div class="refsynopsisdiv"><h3 class="title">Calling Sequence</h3>
<div class="synopsis"><pre><span class="default">y</span><span class="default"> = </span><span class="functionid">chirp</span><span class="default">(</span><span class="default">t</span><span class="default">)</span>
<span class="default">y</span><span class="default"> = </span><span class="functionid">chirp</span><span class="default">(</span><span class="default">t</span><span class="default">, </span><span class="default">f0</span><span class="default">)</span>
<span class="default">y</span><span class="default"> = </span><span class="functionid">chirp</span><span class="default">(</span><span class="default">t</span><span class="default">, </span><span class="default">f0</span><span class="default">, </span><span class="default">t1</span><span class="default">)</span>
<span class="default">y</span><span class="default"> = </span><span class="functionid">chirp</span><span class="default">(</span><span class="default">t</span><span class="default">, </span><span class="default">f0</span><span class="default">, </span><span class="default">t1</span><span class="default">, </span><span class="default">f1</span><span class="default">)</span>
<span class="default">y</span><span class="default"> = </span><span class="functionid">chirp</span><span class="default">(</span><span class="default">t</span><span class="default">, </span><span class="default">f0</span><span class="default">, </span><span class="default">t1</span><span class="default">, </span><span class="default">f1</span><span class="default">, </span><span class="default">frm</span><span class="default">)</span>
<span class="default">y</span><span class="default"> = </span><span class="functionid">chirp</span><span class="default">(</span><span class="default">t</span><span class="default">, </span><span class="default">f0</span><span class="default">, </span><span class="default">t1</span><span class="default">, </span><span class="default">f1</span><span class="default">, </span><span class="default">frm</span><span class="default">, </span><span class="default">phse</span><span class="default">)</span></pre></div></div>
<div class="refsection"><h3 class="title">Parameters</h3>
<dl><dt><span class="term">t:</span>
<dd><p class="para">vector</p></dd></dt>
<dt><span class="term">f0:</span>
<dd><p class="para"></p></dd></dt>
<dt><span class="term">t1:</span>
<dd><p class="para"></p></dd></dt>
<dt><span class="term">f1:</span>
<dd><p class="para"></p></dd></dt>
<dt><span class="term">frm:</span>
<dd><p class="para">string value, takes in "linear", "quadratic", "logarithmic"</p></dd></dt>
<dt><span class="term">phse:</span>
<dd><p class="para"></p></dd></dt></dl></div>
<div class="refsection"><h3 class="title">Description</h3>
<p class="para">This is an Octave function.
This function evaluates a chirp signal at time t. A chirp signal is a frequency swept cosine wave.
The first argument is a vector of times to evaluate the chirp signal, second argument is the frequency at t=0, third argument is time t1 and fourth argument is frequency at t1.
The fifth argument is the form which takes in values "linear", "quadratic" and "logarithmic", the sixth argument gives the phase shift at t=0.</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">chirp</span><span class="scilabopenclose">(</span><span class="scilabopenclose">[</span><span class="scilabnumber">4</span><span class="scilabdefault">,</span><span class="scilabnumber">3</span><span class="scilabdefault">,</span><span class="scilabnumber">2</span><span class="scilabdefault">,</span><span class="scilabnumber">1</span><span class="scilabopenclose">]</span><span class="scilabdefault">,</span><span class="scilabnumber">4</span><span class="scilabdefault">,</span><span class="scilabnumber">5</span><span class="scilabdefault">,</span><span class="scilabnumber">0.9</span><span class="scilabopenclose">)</span>
<span class="scilabid">ans</span> <span class="scilaboperator">=</span>
<span class="scilabid">column</span> <span class="scilabnumber">1</span> <span class="scilabid">to</span> <span class="scilabnumber">3</span>
<span class="scilabnumber">0.9685832</span> <span class="scilabnumber">0.2486899</span> <span class="scilabnumber">0.0627905</span>
<span class="scilabid">column</span> <span class="scilabnumber">4</span>
<span class="scilaboperator">-</span> <span class="scilabnumber">0.3681246</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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