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<span class="refentrytitle">vdelayxs</span>
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<p>vdelayxs —
A stereo variable delay opcode with high quality interpolation.
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<div class="refsect1" title="Description">
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<h2>Description</h2>
<p>
A stereo variable delay opcode with high quality interpolation.
</p>
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<div class="refsect1" title="Syntax">
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<h2>Syntax</h2>
<pre class="synopsis">aout1, aout2 <span class="command"><strong>vdelayxs</strong></span> ain1, ain2, adl, imd, iws [, ist]</pre>
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<div class="refsect1" title="Initialization">
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<h2>Initialization</h2>
<p>
<span class="emphasis"><em>imd</em></span> -- max. delay time (seconds)
</p>
<p>
<span class="emphasis"><em>iws</em></span> -- interpolation window size (see below)
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<p>
<span class="emphasis"><em>ist</em></span> (optional) -- skip initialization if not zero
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<div class="refsect1" title="Performance">
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<h2>Performance</h2>
<p>
<span class="emphasis"><em>aout1, aout2</em></span> -- output audio signals
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<p>
<span class="emphasis"><em>ain1, ain2</em></span> -- input audio signals
</p>
<p>
<span class="emphasis"><em>adl</em></span> -- delay time in seconds
</p>
<p>
This opcode uses high quality (and slow) interpolation, that is much more accurate than the currently available linear and cubic interpolation. The <span class="emphasis"><em>iws</em></span> 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.
</p>
<p>
The multichannel opcodes (eg. <span class="emphasis"><em>vdelayxq</em></span>) allow delaying 2 or 4 variables at once (stereo or quad signals); this is much more efficient than using separate opcodes for each channel.
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<p>Delay time is measured in seconds (unlike in vdelay and vdelay3), and must be a-rate.</p>
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<p>The minimum allowed delay is iws/2 samples.</p>
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<p>Using the same variables as input and output is allowed in these opcodes.</p>
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<p>In vdelayxw*, changing the delay time has some effects on output volume: </p>
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<p>a = 1 / (1 + dt)</p>
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<p> where a is the output gain, and dt is the change of delay time per seconds.</p>
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<li class="listitem">
<p>These opcodes are best used in the double-precision version of Csound.</p>
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<div class="refsect1" title="See Also">
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<h2>See Also</h2>
<p>
<a class="link" href="vdelayx.html" title="vdelayx"><em class="citetitle">vdelayx</em></a>,
<a class="link" href="vdelayxq.html" title="vdelayxq"><em class="citetitle">vdelayxq</em></a>,
<a class="link" href="vdelayxw.html" title="vdelayxw"><em class="citetitle">vdelayxw</em></a>,
<a class="link" href="vdelayxwq.html" title="vdelayxwq"><em class="citetitle">vdelayxwq</em></a>,
<a class="link" href="vdelayxws.html" title="vdelayxws"><em class="citetitle">vdelayxws</em></a>
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