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Update ao_model_retrieve_in_timespan
author Daniele Nicolodi <nicolodi@science.unitn.it>
date Mon, 05 Dec 2011 16:20:06 +0100
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  <h1 class="title"><a name="f3-12899" id="f3-12899"></a>Create transfer function models in s domain</h1>
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<h2>Building transfer function models</h2>

<p>
  In this first part we will focus on the creation of transfer function 
  models to then see how these can be translated into digital filters and applied to data.
  In the LTPDA toolbox, there are three possible ways to express a transfer function 
  which can be more or less suitable depending on your particular 
  application: 
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    <li>Pole zero models </li>
    <li>Partial fraction models</li>
    <li>Rational models</li>
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