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<refentry id="plltrack">
<indexterm id="Indexplltrack"><primary>plltrack</primary></indexterm>
<refentryinfo><title>Instrument Control:Sensing and Control</title></refentryinfo>
<refmeta>
<refentrytitle>plltrack</refentrytitle>
</refmeta>
<refnamediv>
<refname>plltrack</refname>
<refpurpose>
Tracks the pitch of a signal.
</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<para>
<emphasis>plltrack</emphasis>, a pitch tracker based on a phase-locked loop algorithm, described in Zolzer, U, Sankarababu, S.V. and Moller, S, "PLL-based Pitch Detection and Tracking for Audio Signals. Proc. of IIH-MSP 2012".
</para>
</refsect1>
<refsect1>
<title>Syntax</title>
<synopsis>acps, alock <command>plltrack</command> asig, kd [, kloopf, kloopq, klf, khf, kthresh]</synopsis>
</refsect1>
<refsect1>
<title>Performance</title>
<para>
<emphasis>acps</emphasis> -- estimated pitch in Hz.
</para>
<para>
<emphasis>alock</emphasis> -- phase lock indicator, a phase error indicating the quality of the tracking, with values between 0 and 1. Higher values
indicate good tracking
</para>
<para>
<emphasis>kd</emphasis> -- PLL feedback gain, controls frequency range of PLL (between 0 and 1). Higher values increase the range of the tracking.
</para>
<para>
<emphasis>kloopf</emphasis> -- PLL LP filter cf, controls frequency range of PLL (opt, defaults to 20Hz).
</para>
<para>
<emphasis>kloopq</emphasis> -- PLL LP filter Q, controls rise time of FO step (opt, defaults to 1/3)
</para>
<para>
<emphasis>klf</emphasis> -- lowest tracking freq (opt, defaults to 20Hz)
</para>
<para>
<emphasis>khf</emphasis> -- highest tracking freq (opt, defaults to 1500Hz)
</para>
<para>
<emphasis>kthresh</emphasis> -- tracking signal level threshold (optional, defaults to 0.001, equiv to -60dBfs)
</para>
<para>
<emphasis>plltrack</emphasis> analyzes the input signal, <emphasis>asig</emphasis>,
estimating the fundamental of a monophonic signal. Its output is updated every sample.
</para>
</refsect1>
<refsect1>
<title>Examples</title>
<para>
Here is an example of the plltrack operator. It uses the file <ulink url="examples/plltrack.csd"><citetitle>plltrack.csd</citetitle></ulink>.
<example>
<title>Example of the plltrack operator.</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/plltrack.csd.xml" xmlns:xi="http://www.w3.org/2001/XInclude"/>
</example>
</para>
</refsect1>
<refsect1>
<title>Credits</title>
<para>
<simplelist>
<member>Author: &namevictor;</member>
<member>NUI, Maynooth.</member>
<member>Maynooth, Ireland</member>
<member>September, 2012</member>
</simplelist>
</para>
<para>New in Csound version 5.18.031</para>
</refsect1>
</refentry>
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