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