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author | Daniele Nicolodi <nicolodi@science.unitn.it> |
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date | Mon, 05 Dec 2011 16:20:06 +0100 |
parents | f0afece42f48 |
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<!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>Converting models between different representations (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;"> </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= "rational.html"><img src="b_prev.gif" border="0" align= "bottom" alt="Rational representation"></a> <a href= "pzmodel_filter.html"><img src="b_next.gif" border="0" align= "bottom" alt="Converting models to digital filters"></a></td> </tr> </table> <h1 class="title"><a name="f3-12899" id="f3-12899"></a>Converting models between different representations</h1> <hr> <p> The different constructors from each transfer function representations accept as an input a model from a another representation so that they can all be converted between the different representations. In the current LTPDA version, this applies for pole/zero model and rational representation. Following versions will cover the partial fraction representation. This is shown in the following transformation table: <div align="center"> <img src="images/TransformTable.png" alt="Pole/zero model TF" border="3"> </div> <h2>From pzmodel to rational</a></h2> You can transform a <tt>pzmodel</tt> into a <tt>rational</tt> by typing: <br> <div class="fragment"><pre> >> rat = rational(pzmodel) </pre></div> <br> <h2>From rational to pzmodel</a></h2> You can transform a <tt>rational</tt> into a <tt>pzmodel</tt> by typing: <br> <div class="fragment"><pre> >> rat = pzmodel(rational) </pre></div> <br> <h2>Algorithm</a></h2> To translate from <tt>rational</tt> to <tt>pzmodel</tt> representation we need to compute the roots of a polynomial and the inverse operation is performed going from <tt>pzmodel</tt> to <tt>rational</tt>. More information about the algorithm used can be found in MATLAB's functions <a href="matlab:doc('poly')">poly</a> and <a href="matlab:doc('roots')">roots</a>. </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="rational.html"><img src= "b_prev.gif" border="0" align="bottom" alt= "Rational representation"></a> </td> <td align="left">Rational representation</td> <td> </td> <td align="right">Converting models to digital filters</td> <td align="right" width="20"><a href= "pzmodel_filter.html"><img src="b_next.gif" border="0" align= "bottom" alt="Converting models to digital filters"></a></td> </tr> </table><br> <p class="copy">©LTP Team</p> </body> </html>