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author Daniele Nicolodi <nicolodi@science.unitn.it>
date Mon, 05 Dec 2011 16:20:06 +0100
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  <title>The pole/zero model helper (LTPDA Toolbox)</title>
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  <p style="font-size:1px;">&nbsp;</p>

  <table class="nav" summary="Navigation aid" border="0" width=
  "100%" cellpadding="0" cellspacing="0">
    <tr>
      <td valign="baseline"><b>LTPDA Toolbox</b></td><td><a href="../helptoc.html">contents</a></td>

      <td valign="baseline" align="right"><a href=
      "gui_workspacebrowser.html"><img src="b_prev.gif" border="0" align=
      "bottom" alt="The LTPDA Workspace Browser"></a>&nbsp;&nbsp;&nbsp;<a href=
      "gui_specwin.html"><img src="b_next.gif" border="0" align=
      "bottom" alt="The Spectral Window GUI"></a></td>
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  </table>

  <h1 class="title"><a name="f3-12899" id="f3-12899"></a>The pole/zero model helper</h1>
  <hr>
  
  <p>
	<p>
  The LTPDA toolbox contains a class (<tt>pzmodel</tt>) for creating and using pole/zero models. 
  The <it>pole/zero model helper GUI</it> allows the user to visualise the pole/zero model as it's
  being designed. It also allows the user to quickly see how the corresponding IIR filter 
  (<tt>miir</tt> object) will look for different sample rates.
</p>	
<p>
  To start the pole/zero model helper:
  <div class="fragment">
    <pre>
      >> pzmodel_helper
</pre>
  </div>
  or click the appropriate button on the LTPDA Launch Bay.
</p>
<p>
  Once the GUI is loaded, you will see the following figure:
</p>
<br>
<img src="images/pzmodel_helper.png" alt="pzmodel helper" border="3">
<br>
<p>
  You can add poles and zeros to the model by entering the frequency (and Q) in the edit boxes, then click
  <tt>Add pole</tt> or <tt>Add zero</tt> as appropriate. The response is then updated in the response axes.   
</p>
<br>
<img src="images/pzmodel_helper_eg1.png" alt="pzmodel helper" border="3">
<br>


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      <td align="left" width="20"><a href="gui_workspacebrowser.html"><img src=
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      "The LTPDA Workspace Browser"></a>&nbsp;</td>

      <td align="left">The LTPDA Workspace Browser</td>

      <td>&nbsp;</td>

      <td align="right">The Spectral Window GUI</td>

      <td align="right" width="20"><a href=
      "gui_specwin.html"><img src="b_next.gif" border="0" align=
      "bottom" alt="The Spectral Window GUI"></a></td>
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  </table><br>

  <p class="copy">&copy;LTP Team</p>
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