Mercurial > hg > ltpda

diff m-toolbox/html_help/help/ug/noisegen.html @ 0:f0afece42f48

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Import.
author Daniele Nicolodi <nicolodi@science.unitn.it>
date Wed, 23 Nov 2011 19:22:13 +0100
parents
children
line wrap: on
line diff
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/m-toolbox/html_help/help/ug/noisegen.html	Wed Nov 23 19:22:13 2011 +0100
@@ -0,0 +1,92 @@
+<!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>Generating model noise (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=
+      "builtin_models.html"><img src="b_prev.gif" border="0" align=
+      "bottom" alt="Built-in models of LTPDA"></a>&nbsp;&nbsp;&nbsp;<a href=
+      "franklin_ng.html"><img src="b_next.gif" border="0" align=
+      "bottom" alt="Franklin noise-generator"></a></td>
+    </tr>
+  </table>
+
+  <h1 class="title"><a name="f3-12899" id="f3-12899"></a>Generating model noise</h1>
+  <hr>
+  
+  <p>
+	<p>
+
+Generating non-white random noise means producing arbitrary long time series with a given spectral density.
+Such time series are needed for example for the following purposes:
+</p>
+<p>
+	<ul>
+		<li> To generate test data sets for programs that compute spectral densities, </li>
+		<li> as inputs for various simulations.</li>
+	</ul>
+</p>
+<p>
+  One way of doing this is to apply digital filters (FIR or IIR) to white input noise.<br/>
+  This approach is effectively implemented for the generation of <a href="ndim_ng.html"> multichannel noise </a>
+  with a given cross spectral density. <br/>
+  Multichannel transfer functions are identified by an automatic fit procedure based 
+  on a modified version of the vector-fitting algorithm 
+  (see <a href="zdomainfit.html"> Z-Domain Fit </a> for further details on the algorithm). <br/>
+  Partial fraction expansion of multichannel transfer functions and the implementation of 
+  <a href="sigproc_dfilt.html">filter</a> state initialization avoid the presence of unwanted 'warm-up period'.
+</p>
+
+<p>
+	A different approach is implemented in LTPDA as <a href="franklin_ng.html">Franklin noise-generator</a>.<br/>
+	It produces spectral densities according to a given pole zero model (see <a href="pzmodel.html">Pole/Zero Modeling</a>) and does not require any warm-up period. <br/>
+</p>
+
+  </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="builtin_models.html"><img src=
+      "b_prev.gif" border="0" align="bottom" alt=
+      "Built-in models of LTPDA"></a>&nbsp;</td>
+
+      <td align="left">Built-in models of LTPDA</td>
+
+      <td>&nbsp;</td>
+
+      <td align="right">Franklin noise-generator</td>
+
+      <td align="right" width="20"><a href=
+      "franklin_ng.html"><img src="b_next.gif" border="0" align=
+      "bottom" alt="Franklin noise-generator"></a></td>
+    </tr>
+  </table><br>
+
+  <p class="copy">&copy;LTP Team</p>
+</body>
+</html>