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<span class="path"><a href="index.html">FOSSEE Signal Processing Toolbox</a> >> <a href="section_cc2bc01c47967d47fcf3507a91d572ba.html">FOSSEE Signal Processing Toolbox</a> > periodogram</span>
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<div class="refnamediv"><h1 class="refname">periodogram</h1>
<p class="refpurpose">Return the periodogram (Power Spectral Density) of X</p></div>
<div class="refsynopsisdiv"><h3 class="title">Calling Sequence</h3>
<div class="synopsis"><pre><span class="default">[</span><span class="default">PXX</span><span class="default">, </span><span class="default">W</span><span class="default">] = </span><span class="functionid">periodogram</span><span class="default"> (</span><span class="default">X</span><span class="default">)</span>
<span class="default">[</span><span class="default">PXX</span><span class="default">, </span><span class="default">W</span><span class="default">] = </span><span class="functionid">periodogram</span><span class="default"> (</span><span class="default">X</span><span class="default">, </span><span class="default">WIN</span><span class="default">)</span>
<span class="default">[</span><span class="default">PXX</span><span class="default">, </span><span class="default">W</span><span class="default">] = </span><span class="functionid">periodogram</span><span class="default"> (</span><span class="default">X</span><span class="default">, </span><span class="default">WIN</span><span class="default">, </span><span class="default">NFFT</span><span class="default">)</span>
<span class="default">[</span><span class="default">PXX</span><span class="default">, </span><span class="default">W</span><span class="default">] = </span><span class="functionid">periodogram</span><span class="default"> (</span><span class="default">X</span><span class="default">, </span><span class="default">WIN</span><span class="default">, </span><span class="default">NFFT</span><span class="default">, </span><span class="default">FS</span><span class="default">)</span>
<span class="default">[</span><span class="default">PXX</span><span class="default">, </span><span class="default">W</span><span class="default">] = </span><span class="functionid">periodogram</span><span class="default"> (..., </span>"<span class="default">RANGE</span>"<span class="default">)</span></pre></div></div>
<div class="refsection"><h3 class="title">Parameters</h3>
<dl><dt><span class="term">X:</span>
<dd><p class="para">data vector. If X is real-valued a one-sided spectrum is estimated. If X is complex-valued, or "RANGE" specifies "twosided", the full spectrum is estimated.</p></dd></dt>
<dt><span class="term">WIN:</span>
<dd><p class="para">window weight data. If window is empty or unspecified a default rectangular window is used. Otherwise, the window is applied to the signal ('X .* WIN') before computing th periodogram. The window data must be a vector of the same length as X.</p></dd></dt>
<dt><span class="term">NFFT:</span>
<dd><p class="para">number of frequency bins. The default is 256 or the next higher power of 2 greater than the length of X ('max (256,2.^nextpow2 (length (x)))'). If NFFT is greater than the length of the input then X will be zero-padded to the length of NFFT.</p></dd></dt>
<dt><span class="term">FS:</span>
<dd><p class="para">sampling rate. The default is 1.</p></dd></dt>
<dt><span class="term">RANGE:</span>
<dd><p class="para">range of spectrum. "onesided" computes spectrum from [0..nfft/2+1]."twosided" computes spectrum from [0..nfft-1].</p></dd></dt></dl></div>
<div class="refsection"><h3 class="title">Description</h3>
<p class="para">The optional second output W are the normalized angular frequencies. For a one-sided calculation W is in the range [0, pi]. If NFFT is even and [0, pi) if NFFT is odd. Similarly, for a two-sided calculation W is in the range [0, 2*pi] or [0, 2*pi)depending on NFFT.</p>
<p class="para">If a sampling frequency is specified, FS, then the output frequencies F will be in the range [0, FS/2] or [0, FS/2) for one-sided calculations. For two-sided calculations the range will be [0, FS).</p>
<p class="para">When called with no outputs the periodogram is immediately plotted in the current figure window.</p></div>
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