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<refentry id="barmodel">
<indexterm id="IndexBarmodel"><primary>barmodel</primary></indexterm>
<refentryinfo><title>Signal Generators:Models and Emulations</title></refentryinfo>
<refmeta>
<refentrytitle>barmodel</refentrytitle>
</refmeta>
<refnamediv>
<refname>barmodel</refname>
<refpurpose>
Creates a tone similar to a struck metal bar.
</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<para>
Audio output is a tone similar to a struck metal bar, using a
physical model developed from solving the partial differential
equation. There are controls over the boundary conditions as
well as the bar characteristics.
</para>
</refsect1>
<refsect1>
<title>Syntax</title>
<synopsis>ares <command>barmodel</command> kbcL, kbcR, iK, ib, kscan, iT30, ipos, ivel, iwid</synopsis>
</refsect1>
<refsect1>
<title>Initialization</title>
<para>
<emphasis>iK</emphasis> -- dimensionless stiffness parameter. If
this parameter is negative then the initialisation is skipped and
the previous state of the bar is continued.
</para>
<para>
<emphasis>ib</emphasis> -- high-frequency loss parameter (keep this small).
</para>
<para>
<emphasis>iT30</emphasis> -- 30 db decay time in seconds.
</para>
<para>
<emphasis>ipos</emphasis> -- position along the bar that the strike occurs.
</para>
<para>
<emphasis>ivel</emphasis> -- normalized strike velocity.
</para>
<para>
<emphasis>iwid</emphasis> -- spatial width of strike.
</para>
</refsect1>
<refsect1>
<title>Performance</title>
<para>
A note is played on a metalic bar, with the arguments as below.
</para>
<para>
<emphasis>kbcL</emphasis> -- Boundary condition at left end of
bar (1 is clamped, 2 pivoting and 3 free).
</para>
<para>
<emphasis>kbcR</emphasis> -- Boundary condition at right end of
bar (1 is clamped, 2 pivoting and 3 free).
</para>
<para>
<emphasis>kscan</emphasis> -- Speed of scanning the output location.
</para>
<para>
Note that changing the boundary conditions during playing may
lead to glitches and is made available as an experiment. The use of
a non-zero <emphasis>kscan</emphasis> can give apparent re-introduction of sound due to
modulation.
</para>
</refsect1>
<refsect1>
<title>Examples</title>
<para>
Here is an example of the barmodel opcode. It uses the file <ulink url="examples/barmodel.csd"><citetitle>barmodel.csd</citetitle></ulink>.
<example>
<title>Example of the barmodel opcode.</title>
<para>See the sections <link linkend="UsingRealTime"><citetitle>Real-time Audio</citetitle></link> and <link linkend="CommandFlags"><citetitle>Command Line Flags</citetitle></link> for more information on using command line flags.</para>
<xi:include href="examples-xml/barmodel.csd.xml" xmlns:xi="http://www.w3.org/2001/XInclude"/>
</example>
</para>
</refsect1>
<refsect1>
<title>Credits</title>
<para>
<simplelist>
<member>Author: Stefan Bilbao </member>
<member>University of Edinburgh, UK</member>
<member>Author: &namejohn; </member>
<member>University of Bath, Codemist Ltd.</member>
<member>Bath, UK</member>
</simplelist>
</para>
<para>New in Csound version 5.01</para>
</refsect1>
</refentry>
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