Mercurial > hg > ltpda

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
   "http://www.w3.org/TR/1999/REC-html401-19991224/loose.dtd">

<html lang="en">
<head>
  <meta name="generator" content=
  "HTML Tidy for Mac OS X (vers 1st December 2004), see www.w3.org">
  <meta http-equiv="Content-Type" content=
  "text/html; charset=us-ascii">

  <title>Applying digital filters to data (LTPDA Toolbox)</title>
  <link rel="stylesheet" href="docstyle.css" type="text/css">
  <meta name="generator" content="DocBook XSL Stylesheets V1.52.2">
  <meta name="description" content=
  "Presents an overview of the features, system requirements, and starting the toolbox.">
  </head>

<body>
  <a name="top_of_page" id="top_of_page"></a>

  <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=
      "sigproc_filterbanks.html"><img src="b_prev.gif" border="0" align=
      "bottom" alt="Filter banks"></a>&nbsp;&nbsp;&nbsp;<a href=
      "sigproc_diff.html"><img src="b_next.gif" border="0" align=
      "bottom" alt="Discrete Derivative"></a></td>
    </tr>
  </table>

  <h1 class="title"><a name="f3-12899" id="f3-12899"></a>Applying digital filters to data</h1>
  <hr>

  <p>

<!-- ================================================== -->
<!--                 BEGIN CONTENT FILE                 -->
<!-- ================================================== -->
<!-- ===== link box: Begin ===== -->
<p>
  <table border="1"  width="80%">
    <tr>
      <td>
        <table border="0" cellpadding="5" class="categorylist" width="100%">
          <colgroup>
            <col width="37%"/>
            <col width="63%"/>
          </colgroup>
          <tbody>
            <tr valign="top">
              <td>
                <a href="#Applyfiltdesc">Description</a>
              </td>
              <td>Digital filtering with LTPDA filters objects.</td>
            </tr>
            <tr valign="top">
              <td>
                <a href="#Applyfiltexample">Examples</a>
              </td>
              <td>How to filter a data series in LTPDA.</td>
            </tr>
          </tbody>
        </table>
      </td>
    </tr>
  </table>
</p>
<!-- ===== link box: End ====== -->


<!-- ===== filtering in LTPDA description ===== -->
<h2><a name="Applyfiltdesc">Description</a></h2>
<p>
  Digital filtering in LTPDA can be performed by a call to the <tt>ao/filter</tt> method.
  <tt>ao/filter</tt> method is a wrapper of the standard MATLAB filter method.
  Details of the core algorithm can be found in the proper
  <a href="matlab:doc('filter')">documentation page</a>.
</p>


<!-- ===== Examples ===== -->

<h2><a name="Applyfiltexample">Examples</a></h2>
<p>
  Given an input analysis object (can be a time series or a frequency series object)
  <tt>a_in</tt>, digital filtering operation can be easily performed:
</p>

<div class="fragment"><pre>

    a_out = filter(a_in,fobj)

</pre></div>

<p>
  Where <tt>fobj</tt> is a filter. It can be a <a href="sigproc_iir.html">MIIR</a>,
  a <a href="sigproc_fir.html">MFIR</a>
  or a <a href="sigproc_filterbanks.html">FILTERBANK</a> object.
</p>
<p>
  The filter object <tt>fobj</tt> can be also embedded in a plist
</p>

<div class="fragment"><pre>

    pl = plist(<span class="string">'filter'</span>, fobj);
    a_out = filter(a_in,pl)

</pre></div>


  </p>

  <br>
  <br>
  <table class="nav" summary="Navigation aid" border="0" width=
  "100%" cellpadding="0" cellspacing="0">
    <tr valign="top">
      <td align="left" width="20"><a href="sigproc_filterbanks.html"><img src=
      "b_prev.gif" border="0" align="bottom" alt=
      "Filter banks"></a>&nbsp;</td>

      <td align="left">Filter banks</td>

      <td>&nbsp;</td>

      <td align="right">Discrete Derivative</td>

      <td align="right" width="20"><a href=
      "sigproc_diff.html"><img src="b_next.gif" border="0" align=
      "bottom" alt="Discrete Derivative"></a></td>
    </tr>
  </table><br>

  <p class="copy">&copy;LTP Team</p>
</body>
</html>
author	Daniele Nicolodi <nicolodi@science.unitn.it>
date	Wed, 07 Dec 2011 17:24:37 +0100
parents	f0afece42f48
children