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<?xml version="1.0" encoding="UTF-8"?>
<!--
* Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
* Copyright (C) ????-2006 - INRIA - Scilab
*
* This file must be used under the terms of the CeCILL.
* This source file is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at
* http://www.cecill.info/licences/Licence_CeCILL_V2.1-en.txt
*
-->
<refentry xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:svg="http://www.w3.org/2000/svg" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:db="http://docbook.org/ns/docbook" xmlns:scilab="http://www.scilab.org" xml:lang="en" xml:id="auwrite">
<refnamediv>
<refname>auwrite</refname>
<refpurpose>writes .au sound file</refpurpose>
</refnamediv>
<refsynopsisdiv>
<title>Calling Sequence</title>
<synopsis>auwrite(y,aufile)
auwrite(y,Fs,aufile)
auwrite(y,Fs,bits,aufile)
auwrite(y,Fs,bits,method,aufile)
</synopsis>
</refsynopsisdiv>
<refsection>
<title>Arguments</title>
<variablelist>
<varlistentry>
<term>y</term>
<listitem>
<para>real vector or matrix with entries in [-1,1].</para>
</listitem>
</varlistentry>
<varlistentry>
<term>aufile</term>
<listitem>
<para>string (The .au extension is appended if no extension is given)</para>
</listitem>
</varlistentry>
<varlistentry>
<term>Fs</term>
<listitem>
<para>integer, frequency sampling in Hz.</para>
</listitem>
</varlistentry>
<varlistentry>
<term>bits</term>
<listitem>
<para>integer, number of bits in the encoding.</para>
</listitem>
</varlistentry>
<varlistentry>
<term>method</term>
<listitem>
<para>
string , <literal>'mu'</literal> (default) or <literal>'linear'</literal>, encoding method.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsection>
<refsection>
<title>Description</title>
<para>
Utility function to save <literal>.au</literal> sound file.
<literal>auwrite(y,aufile)</literal> writes a sound file specified by the
string aufile. The data should be arranged with one channel
per column. Amplitude values outside the range [-1,+1] are
ignored.
Supports multi-channel data for 8-bit mu-law, and 8, 16, 32, 64 bits linear formats.
</para>
<para>
<literal>auwrite(y,Fs,aufile)</literal> specifies in <literal>Fs</literal> the sample rate of the data
in Hertz.
</para>
<para>
<literal>auwrite(y,Fs,bits,aufile)</literal> selects the number of bits in
the encoder. Allowable settings are bits in [8,16,32,64].
<literal>auwrite(y,Fs,bits,method,aufile)</literal> allows selection of the
encoding method, which can be either 'mu' or 'linear'.
Note that bits must be 8 for 'mu' choice. The default method is 8-bits mu-law encoding.
</para>
</refsection>
<refsection>
<title>Examples</title>
<programlisting role="example"><![CDATA[
A=matrix(1:6,2,3);
auwrite(A/6,22050,64,'linear',TMPDIR+'/foo.au');
B=auread(TMPDIR+'/foo.au');
max(abs(A- round(B*6)))
]]></programlisting>
</refsection>
<refsection role="see also">
<title>See Also</title>
<simplelist type="inline">
<member>
<link linkend="auread">auread</link>
</member>
<member>
<link linkend="wavread">wavread</link>
</member>
<member>
<link linkend="savewave">savewave</link>
</member>
<member>
<link linkend="analyze">analyze</link>
</member>
<member>
<link linkend="mapsound">mapsound</link>
</member>
</simplelist>
</refsection>
</refentry>
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