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author Daniele Nicolodi <nicolodi@science.unitn.it>
date Mon, 05 Dec 2011 18:04:34 +0100
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  <title>Constructor examples of the SPECWIN class (LTPDA Toolbox)</title>
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  <h1 class="title"><a name="f3-12899" id="f3-12899"></a>Constructor examples of the SPECWIN class</h1>
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<table border="0" summary="Simple list" class="simplelist_nottable_last">
  <tr>
    <td>
      <a href="constructor_examples_specwin.html#empty">Construct empty SPECWIN object</a>
    </td>
  </tr>
  <tr>
    <td>
      <a href="constructor_examples_specwin.html#xml_file">Construct a SPECWIN object by loading the object from a file</a>
    </td>
  </tr>
  <tr>
    <td>
      <a href="constructor_examples_specwin.html#particular">Construct a SPECWIN of a particular window type an length</a>
    </td>
  </tr>
  <tr>
    <td>
      <a href="constructor_examples_specwin.html#kaiser">Construct a SPECWIN Kaiser window with the prescribed psll</a>
    </td>
  </tr>
  <tr>
    <td>
      <a href="constructor_examples_specwin.html#plist">Construct a SPECWIN object from a parameter list (PLIST) object</a>
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<hr>
<h2 class="title"><a href="gui_specwin.html">For help in designing a SPECWIN object, see also the Spectral Window GUI documentation</a></h2>
<hr />
<h2 class="title"></h2>
<h2 class="title"><a name="empty"></a>Construct empty SPECWIN object</h2>
<p>The following example creates an empty specwin object</p>
<div class="fragment"><pre class="programlisting">
w = specwin()
-------- None ------------

   alpha: -1
    psll: -1
     rov: -1
   nenbw: -1
    w3db: -1
flatness: -1
      ws: -1
     ws2: -1
     win: 1

--------------------------
</pre></div>

<!-- --------------- NEXT EXAMPLE --------------- -->

<hr>
<h2 class="title"><a name="xml_file"></a>Construct a SPECWIN object by loading the object from a file</h2>
<p>The following example creates a new specwin object by loading the specwin object from disk.</p>
<div class="fragment"><pre class="programlisting">
p = specwin(<span class="string">'specwin.mat'</span>)
p = specwin(<span class="string">'specwin.xml'</span>)
</pre></div>

<!-- --------------- NEXT EXAMPLE --------------- -->

<hr>
<h2 class="title"><a name="particular"></a>Construct a SPECWIN of a particular window type an length</h2>
  <p>To create a spectral window object, you call the <tt>specwin</tt> class constructor. The following
	code fragment creates a 100-point Hanning window:
  </p>
  <div class="fragment"><pre>
	>> w = specwin(<span class="string">'Hanning'</span>, 100)
	-------- Hanning ------------

	   alpha: 0
	    psll: 31.5
	     rov: 50
	   nenbw: 1.5
	    w3db: 1.4382
	flatness: -1.4236
	      ws: 50
	     ws2: 37.5
	     win: 100

	-----------------------------
	</pre></div>
  <p><a href="specwin_description.html">List of available window functions</a></p>

<!-- --------------- NEXT EXAMPLE --------------- -->

<hr>
<h2 class="title"><a name="kaiser"></a>Construct a SPECWIN Kaiser window with the prescribed psll</h2>
  <p>In the special case of creating a Kaiser window, the additional input parameter, PSLL, must be supplied. For example, the following code creates a 100-point Kaiser window with -150dB peak side-lobe level:</p>
  <div class="fragment"><pre>
	>> w = specwin(<span class="string">'Kaiser'</span>, 100, 150)
	-------- Kaiser ------------

	   alpha: 6.18029
	    psll: 150
	     rov: 73.3738
	   nenbw: 2.52989
	    w3db: 2.38506
	flatness: -0.52279
	      ws: 28.2558
	     ws2: 20.1819
	     win: 100

	----------------------------
	</pre></div>

<!-- --------------- NEXT EXAMPLE --------------- -->

<hr>
<h2 class="title"><a name="plist"></a>Construct a SPECWIN object from a parameter list (PLIST) object</h2>
<p>Construct a SPECWIN from its definion.
  <table border="0" summary="Simple list" class="simplelist_nottable_last" width="50%">
    <tr valign="top">
      <td width="25%">
        <p>'Name'</p>
      </td>
      <td width="75%">
        <p>Spectral window name [default: 'Kaiser']</p>
      </td>
    </tr>
    <tr valign="top">
      <td width="25%">
        <p>'N'</p>
      </td>
      <td width="75%">
        <p>Spectral window length [default: 10]</p>
      </td>
    </tr>
    <tr valign="top">
      <td width="25%">
        <p>'PSLL'</p>
      </td>
      <td width="75%">
        <p>Peak sidelobe length (only for Kaiser type)<br />[default: 150]</p>
      </td>
    </tr>
  </table>
</p>
<div class="fragment"><pre class="programlisting">
pl = plist(<span class="string">'Name'</span>, <span class="string">'Kaiser'</span>, <span class="string">'N'</span>, 1000, <span class="string">'PSLL'</span>, 75);

w = specwin(pl)
-------- Kaiser ------------

   alpha: 3.21394
    psll: 75
     rov: 63.4095
   nenbw: 1.85055
    w3db: 1.75392
flatness: -0.963765
      ws: 389.305
     ws2: 280.892
     win: 1000

----------------------------
</pre></div>
<div class="fragment"><pre class="programlisting">
pl = plist(<span class="string">'Name'</span>, <span class="string">'Hanning'</span>, <span class="string">'N'</span>, 1000);

w =specwin(pl)
-------- Hanning ------------

   alpha: 0
    psll: 31.5
     rov: 50
   nenbw: 1.5
    w3db: 1.4382
flatness: -1.4236
      ws: 500
     ws2: 375
     win: 1000

-----------------------------
</pre></div>













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