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<refentry id="resonk">
<indexterm id="IndexResonk"><primary>resonk</primary></indexterm>
<refentryinfo><title>Signal Modifiers:Standard Filters:Control</title></refentryinfo>
<refmeta>
<refentrytitle>resonk</refentrytitle>
</refmeta>
<refnamediv>
<refname>resonk</refname>
<refpurpose>
A second-order resonant filter.
</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<para>
A second-order resonant filter.
</para>
</refsect1>
<refsect1>
<title>Syntax</title>
<synopsis>kres <command>resonk</command> ksig, kcf, kbw [, iscl] [, iskip]</synopsis>
</refsect1>
<refsect1>
<title>Initialization</title>
<para>
<emphasis>iscl</emphasis> (optional, default=0) -- coded scaling factor for resonators. A value of 1 signifies a peak response factor of 1, i.e. all frequencies other than kcf are attenuated in accordance with the (normalized) response curve. A value of 2 raises the response factor so that its overall RMS value equals 1. (This intended equalization of input and output power assumes all frequencies are physically present; hence it is most applicable to white noise.) A zero value signifies no scaling of the signal, leaving that to some later adjustment (see <link linkend="balance"><citetitle>balance</citetitle></link>). The default value is 0.
</para>
<para>
<emphasis>iskip</emphasis> (optional, default=0) -- initial disposition of internal data space. Since filtering incorporates a feedback loop of previous output, the initial status of the storage space used is significant. A zero value will clear the space; a non-zero value will allow previous information to remain. The default value is 0.
</para>
</refsect1>
<refsect1>
<title>Performance</title>
<para>
<emphasis>kres</emphasis> -- the output signal at control-rate.
</para>
<para>
<emphasis>ksig</emphasis> -- the input signal at control-rate.
</para>
<para>
<emphasis>kcf</emphasis> -- the center frequency of the filter, or frequency position of the peak response.
</para>
<para>
<emphasis>kbw</emphasis> -- bandwidth of the filter (the Hz difference between the upper and lower half-power points).
</para>
<para>
<emphasis>resonk</emphasis> is like <link linkend="reson"><citetitle>reson</citetitle></link> except its output is at control-rate rather than audio rate.
</para>
</refsect1>
<refsect1>
<title>See Also</title>
<para>
<link linkend="areson"><citetitle>areson</citetitle></link>,
<link linkend="aresonk"><citetitle>aresonk</citetitle></link>,
<link linkend="atone"><citetitle>atone</citetitle></link>,
<link linkend="atonek"><citetitle>atonek</citetitle></link>,
<link linkend="port"><citetitle>port</citetitle></link>,
<link linkend="portk"><citetitle>portk</citetitle></link>,
<link linkend="reson"><citetitle>reson</citetitle></link>,
<link linkend="tone"><citetitle>tone</citetitle></link>,
<link linkend="tonek"><citetitle>tonek</citetitle></link>
</para>
</refsect1>
<refsect1>
<title>Credits</title>
<para>
<simplelist>
<member>Author: Robin Whittle</member>
<member>Australia</member>
<member>May 1997</member>
</simplelist>
</para>
</refsect1>
</refentry>
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