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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>How to filter data</h1>
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	<h2>How to filter data</h2>

In the previous sections we've been dealing with continuous (in s domain) 
systems. Now we want to apply this to data so we will need first to discretize 
to obtain a digital filter to then apply it to the data. Another typical 
application is not to derive the filter from a model but design it from the 
properties we want it to have (cut-off frequency, order, lowpass...). 
Both topics will be covered here with two examples:
 
<nl>
    <li><b>Obtain a digital filter from a model:</b> we continue with the previous
    closed loop example to translate the obtained models into filters.</li>
    <li><b>Define filter properties:</b> in this section we design a bandpass filter that will 
  allow us to estimate the noise spectrum of interferometer data in the desired
bandwidth.</li>
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