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author Daniele Nicolodi <nicolodi@science.unitn.it>
date Wed, 23 Nov 2011 19:22:13 +0100
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1 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
2 "http://www.w3.org/TR/1999/REC-html401-19991224/loose.dtd">
3
4 <html lang="en">
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7 "HTML Tidy for Mac OS X (vers 1st December 2004), see www.w3.org">
8 <meta http-equiv="Content-Type" content=
9 "text/html; charset=us-ascii">
10
11 <title>Applying digital filters to data (LTPDA Toolbox)</title>
12 <link rel="stylesheet" href="docstyle.css" type="text/css">
13 <meta name="generator" content="DocBook XSL Stylesheets V1.52.2">
14 <meta name="description" content=
15 "Presents an overview of the features, system requirements, and starting the toolbox.">
16 </head>
17
18 <body>
19 <a name="top_of_page" id="top_of_page"></a>
20
21 <p style="font-size:1px;">&nbsp;</p>
22
23 <table class="nav" summary="Navigation aid" border="0" width=
24 "100%" cellpadding="0" cellspacing="0">
25 <tr>
26 <td valign="baseline"><b>LTPDA Toolbox</b></td><td><a href="../helptoc.html">contents</a></td>
27
28 <td valign="baseline" align="right"><a href=
29 "sigproc_filterbanks.html"><img src="b_prev.gif" border="0" align=
30 "bottom" alt="Filter banks"></a>&nbsp;&nbsp;&nbsp;<a href=
31 "sigproc_diff.html"><img src="b_next.gif" border="0" align=
32 "bottom" alt="Discrete Derivative"></a></td>
33 </tr>
34 </table>
35
36 <h1 class="title"><a name="f3-12899" id="f3-12899"></a>Applying digital filters to data</h1>
37 <hr>
38
39 <p>
40
41 <!-- ================================================== -->
42 <!-- BEGIN CONTENT FILE -->
43 <!-- ================================================== -->
44 <!-- ===== link box: Begin ===== -->
45 <p>
46 <table border="1" width="80%">
47 <tr>
48 <td>
49 <table border="0" cellpadding="5" class="categorylist" width="100%">
50 <colgroup>
51 <col width="37%"/>
52 <col width="63%"/>
53 </colgroup>
54 <tbody>
55 <tr valign="top">
56 <td>
57 <a href="#Applyfiltdesc">Description</a>
58 </td>
59 <td>Digital filtering with LTPDA filters objects.</td>
60 </tr>
61 <tr valign="top">
62 <td>
63 <a href="#Applyfiltexample">Examples</a>
64 </td>
65 <td>How to filter a data series in LTPDA.</td>
66 </tr>
67 </tbody>
68 </table>
69 </td>
70 </tr>
71 </table>
72 </p>
73 <!-- ===== link box: End ====== -->
74
75
76
77 <!-- ===== filtering in LTPDA description ===== -->
78 <h2><a name="Applyfiltdesc">Description</a></h2>
79 <p>
80 Digital filtering in LTPDA can be performed by a call to the <tt>ao/filter</tt> method.
81 <tt>ao/filter</tt> method is a wrapper of the standard MATLAB filter method.
82 Details of the core algorithm can be found in the proper
83 <a href="matlab:doc('filter')">documentation page</a>.
84 </p>
85
86
87 <!-- ===== Examples ===== -->
88
89 <h2><a name="Applyfiltexample">Examples</a></h2>
90 <p>
91 Given an input analysis object (can be a time series or a frequency series object)
92 <tt>a_in</tt>, digital filtering operation can be easily performed:
93 </p>
94
95 <div class="fragment"><pre>
96
97 a_out = filter(a_in,fobj)
98
99 </pre></div>
100
101 <p>
102 Where <tt>fobj</tt> is a filter. It can be a <a href="sigproc_iir.html">MIIR</a>,
103 a <a href="sigproc_fir.html">MFIR</a>
104 or a <a href="sigproc_filterbanks.html">FILTERBANK</a> object.
105 </p>
106 <p>
107 The filter object <tt>fobj</tt> can be also embedded in a plist
108 </p>
109
110 <div class="fragment"><pre>
111
112 pl = plist(<span class="string">'filter'</span>, fobj);
113 a_out = filter(a_in,pl)
114
115 </pre></div>
116
117
118
119 </p>
120
121 <br>
122 <br>
123 <table class="nav" summary="Navigation aid" border="0" width=
124 "100%" cellpadding="0" cellspacing="0">
125 <tr valign="top">
126 <td align="left" width="20"><a href="sigproc_filterbanks.html"><img src=
127 "b_prev.gif" border="0" align="bottom" alt=
128 "Filter banks"></a>&nbsp;</td>
129
130 <td align="left">Filter banks</td>
131
132 <td>&nbsp;</td>
133
134 <td align="right">Discrete Derivative</td>
135
136 <td align="right" width="20"><a href=
137 "sigproc_diff.html"><img src="b_next.gif" border="0" align=
138 "bottom" alt="Discrete Derivative"></a></td>
139 </tr>
140 </table><br>
141
142 <p class="copy">&copy;LTP Team</p>
143 </body>
144 </html>