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<refentry id="vdelayx">
<indexterm id="IndexVdelayx"><primary>vdelayx</primary></indexterm>
<refentryinfo><title>Signal Modifiers:Delay</title></refentryinfo>
<refmeta>
<refentrytitle>vdelayx</refentrytitle>
</refmeta>
<refnamediv>
<refname>vdelayx</refname>
<refpurpose>
A variable delay opcode with high quality interpolation.
</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<para>
A variable delay opcode with high quality interpolation.
</para>
</refsect1>
<refsect1>
<title>Syntax</title>
<synopsis>aout <command>vdelayx</command> ain, adl, imd, iws [, ist]</synopsis>
</refsect1>
<refsect1>
<title>Initialization</title>
<para>
<emphasis>imd</emphasis> -- max. delay time (seconds)
</para>
<para>
<emphasis>iws</emphasis> -- interpolation window size (see below)
</para>
<para>
<emphasis>ist</emphasis> (optional) -- skip initialization if not zero
</para>
</refsect1>
<refsect1>
<title>Performance</title>
<para>
<emphasis>aout</emphasis> -- output audio signal
</para>
<para>
<emphasis>ain</emphasis> -- input audio signal
</para>
<para>
<emphasis>adl</emphasis> -- delay time in seconds
</para>
<para>
This opcode uses high quality (and slow) interpolation, that is much more accurate than the currently available linear and cubic interpolation. The <emphasis>iws</emphasis> parameter sets the number of input samples used for calculating one output sample (allowed values are any integer multiply of 4 in the range 4 - 1024); higher values mean better quality and slower speed.
</para>
<note>
<title>Notes</title>
<para>
<itemizedlist>
<listitem><para>Delay time is measured in seconds (unlike in vdelay and vdelay3), and must be a-rate.</para></listitem>
<listitem><para>The minimum allowed delay is iws/2 samples.</para></listitem>
<listitem><para>Using the same variables as input and output is allowed in these opcodes.</para></listitem>
<listitem><para>In vdelayxw*, changing the delay time has some effects on output volume: <literallayout>a = 1 / (1 + dt)</literallayout> where a is the output gain, and dt is the change of delay time per seconds.</para></listitem>
<listitem><para>These opcodes are best used in the double-precision version of Csound.</para></listitem>
</itemizedlist>
</para>
</note>
</refsect1>
<refsect1>
<title>See Also</title>
<para>
<link linkend="vdelayxq"><citetitle>vdelayxq</citetitle></link>,
<link linkend="vdelayxs"><citetitle>vdelayxs</citetitle></link>,
<link linkend="vdelayxw"><citetitle>vdelayxw</citetitle></link>,
<link linkend="vdelayxwq"><citetitle>vdelayxwq</citetitle></link>,
<link linkend="vdelayxws"><citetitle>vdelayxws</citetitle></link>
</para>
</refsect1>
</refentry>
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