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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">
5 <head>
6 <meta name="generator" content=
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>The pole/zero model helper (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 "gui_workspacebrowser.html"><img src="b_prev.gif" border="0" align=
30 "bottom" alt="The LTPDA Workspace Browser"></a>&nbsp;&nbsp;&nbsp;<a href=
31 "gui_specwin.html"><img src="b_next.gif" border="0" align=
32 "bottom" alt="The Spectral Window GUI"></a></td>
33 </tr>
34 </table>
35
36 <h1 class="title"><a name="f3-12899" id="f3-12899"></a>The pole/zero model helper</h1>
37 <hr>
38
39 <p>
40 <p>
41 The LTPDA toolbox contains a class (<tt>pzmodel</tt>) for creating and using pole/zero models.
42 The <it>pole/zero model helper GUI</it> allows the user to visualise the pole/zero model as it's
43 being designed. It also allows the user to quickly see how the corresponding IIR filter
44 (<tt>miir</tt> object) will look for different sample rates.
45 </p>
46 <p>
47 To start the pole/zero model helper:
48 <div class="fragment">
49 <pre>
50 >> pzmodel_helper
51 </pre>
52 </div>
53 or click the appropriate button on the LTPDA Launch Bay.
54 </p>
55 <p>
56 Once the GUI is loaded, you will see the following figure:
57 </p>
58 <br>
59 <img src="images/pzmodel_helper.png" alt="pzmodel helper" border="3">
60 <br>
61 <p>
62 You can add poles and zeros to the model by entering the frequency (and Q) in the edit boxes, then click
63 <tt>Add pole</tt> or <tt>Add zero</tt> as appropriate. The response is then updated in the response axes.
64 </p>
65 <br>
66 <img src="images/pzmodel_helper_eg1.png" alt="pzmodel helper" border="3">
67 <br>
68
69
70 </p>
71
72 <br>
73 <br>
74 <table class="nav" summary="Navigation aid" border="0" width=
75 "100%" cellpadding="0" cellspacing="0">
76 <tr valign="top">
77 <td align="left" width="20"><a href="gui_workspacebrowser.html"><img src=
78 "b_prev.gif" border="0" align="bottom" alt=
79 "The LTPDA Workspace Browser"></a>&nbsp;</td>
80
81 <td align="left">The LTPDA Workspace Browser</td>
82
83 <td>&nbsp;</td>
84
85 <td align="right">The Spectral Window GUI</td>
86
87 <td align="right" width="20"><a href=
88 "gui_specwin.html"><img src="b_next.gif" border="0" align=
89 "bottom" alt="The Spectral Window GUI"></a></td>
90 </tr>
91 </table><br>
92
93 <p class="copy">&copy;LTP Team</p>
94 </body>
95 </html>