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−<p>
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−  Training session 4 is a tutorial of how to build transfer function models.
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−  These transfer functions can be either defined 
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−  by the user or derived from an input/output time series. 
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−  The tutorial also shows how to extract digital filters from the transfer functions 
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−  and how to use these them to filter data. The topic is divided as follows:  
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−  </p>
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−  
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−  <ul>
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−    <li>build transfer functions models in s domain</li>
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−    <li>model system and basic operation with models</li>
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−    <li>extract digital filters from transfer functions</li>
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−    <li>build digital filters</li>
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−    <li>filter data</li>
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−  </ul>
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−