<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML> <HEAD> <TITLE> Area Functions</TITLE> <META NAME="GENERATOR" CONTENT="DOC++ 3.4.6"> </HEAD> <body bgcolor="#ffffff" link="#0000ff" vlink="#dd0000" text="#000088" alink="9000ff"> <A HREF = "http://www.cstr.ed.ac.uk/"> <IMG align=left BORDER=0 SRC = "cstr.gif"></A> <A HREF="http://www.cstr.ed.ac.uk/projects/speech_tools.html"> <IMG BORDER=0 ALIGN=right SRC="est.jpg" width=150 height=93></A> <br> <br clear=left> <p align=right> <TABLE BORDER=0><TR> <TD VALIGN=TOP><H2> <A HREF="#DOC.DOCU">Area Functions</A></H2></TD></H2></TD></TR></TABLE> <TABLE> <TR><TD VALIGN=TOP> <IMG ALT="o" BORDER=0 SRC=icon1.gif><A NAME="ref2truearea"></A> <A HREF=ref2truearea.html><B>ref2truearea</B></A></TD><TD><BR> <I>The area according to the formula.</I> </TD></TR><TR><TD VALIGN=TOP> <IMG ALT="o" BORDER=0 SRC=icon1.gif><A NAME="ref2area"></A> <A HREF=ref2area.html><B>ref2area</B></A></TD><TD><BR> <I>An approximation of the area is calculate by skipping the denominator in the formula.</I> </TD></TR><TR><TD VALIGN=TOP> <IMG ALT="o" BORDER=0 SRC=icon1.gif><A NAME="ref2logarea"></A> <A HREF=ref2logarea.html><B>ref2logarea</B></A></TD><TD><BR> <I>The logs of the areas.</I> </TD></TR> </TABLE> <A NAME="DOC.DOCU"></A> <BLOCKQUOTE>Using the analogy of the lossless tube, the cross-sectional areas of the sections of this tube are related to the reflection coefficients and can be calculated from the following relationship: <P><BR><CENTER><IMG BORDER=0 SRC=g000030.gif><BR></CENTER> </BLOCKQUOTE> <DL><DT><DD></DL><P><P><I><A HREF="index.html">Alphabetic index</A></I> <I><A HREF="HIER.html">Hierarchy of classes</A></I></P><HR> <A HREF = "http://www.ed.ac.uk/"> <IMG align=right BORDER=0 SRC = "edcrest.gif"></A> <P Align=left><I>This page is part of the <A HREF="http://www.cstr.ed.ac.uk/projects/speech_tools.html"> Edinburgh Speech Tools Library</A> documentation <br> Copyright <A HREF="http://www.ed.ac.uk"> University of Edinburgh</A> 1997 <br> Contact: <A HREF="mailto:speech_toolss@cstr.ed.ac.uk"> speech_tools@cstr.ed.ac.uk </a> </P> <br clear=right>