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Next: <a href="Diphone_005fInit.html#Diphone_005fInit" accesskey="n" rel="next">Diphone_Init</a>, Previous: <a href="LPC-databases.html#LPC-databases" accesskey="p" rel="prev">LPC databases</a>, Up: <a href="Diphone-synthesizer.html#Diphone-synthesizer" accesskey="u" rel="up">Diphone synthesizer</a> &nbsp; [<a href="Index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Index.html#Index" title="Index" rel="index">Index</a>]</p>
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<a name="Group-files-1"></a>
<h3 class="section">21.3 Group files</h3>

<a name="index-group-files-1"></a>
<p>Databases may be accessed directly but this is usually too inefficient
for any purpose except debugging.  It is expected that <em>group
files</em> will be built which contain a binary representation of the
database.  A group file is a compact efficient representation of the
diphone database.  Group files are byte order independent, so may be
shared between machines of different byte orders and word sizes.
Certain information in a group file may be changed at load time so a
database name, access strategy etc. may be changed from what was set
originally in the group file.
</p>
<p>A group file contains the basic parameters, the diphone index, the
signal (original waveform or LPC residual), LPC coefficients, and the
pitch marks.  It is all you need for a run-time synthesizer.
Various compression mechanisms are supported to allow smaller databases
if desired.  A full English LPC plus residual database at 8k ulaw
is about 3 megabytes, while a full 16 bit version at 16k is about
8 megabytes.
</p>
<p>Group files are created with the <code>Diphone.group</code> command which
takes a database name and an output filename as an argument.  Making
group files can take some time especially if they are large.  The
<code>group_type</code> parameter specifies <code>raw</code> or <code>ulaw</code>
for encoding signal files.  This can significantly reduce the size
of databases.
</p>
<p>Group files may be partially loaded (see access strategies) at
run time for quicker start up and to minimise run-time
memory requirements.
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