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<h2>
<span class="refentrytitle">vdelayx</span>
</h2>
<p>vdelayx —
A variable delay opcode with high quality interpolation.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp51262096"></a>
<h2>Description</h2>
<p>
A variable delay opcode with high quality interpolation.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp51262768"></a>
<h2>Syntax</h2>
<pre class="synopsis">aout <span class="command"><strong>vdelayx</strong></span> ain, adl, imd, iws [, ist]</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp51272592"></a>
<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)
</p>
<p>
<span class="emphasis"><em>ist</em></span> (optional) -- skip initialization if not zero
</p>
</div>
<div class="refsect1" title="Performance">
<a id="idp51274352"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>aout</em></span> -- output audio signal
</p>
<p>
<span class="emphasis"><em>ain</em></span> -- input audio signal
</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>
<div class="note" title="Notes" style="margin-left: 0.5in; margin-right: 0.5in;">
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<th align="left">Notes</th>
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<td align="left" valign="top">
<p>
</p>
<div class="itemizedlist">
<ul class="itemizedlist" type="disc">
<li class="listitem">
<p>Delay time is measured in seconds (unlike in vdelay and vdelay3), and must be a-rate.</p>
</li>
<li class="listitem">
<p>The minimum allowed delay is iws/2 samples.</p>
</li>
<li class="listitem">
<p>Using the same variables as input and output is allowed in these opcodes.</p>
</li>
<li class="listitem">
<p>In vdelayxw*, changing the delay time has some effects on output volume: </p>
<div class="literallayout">
<p>a = 1 / (1 + dt)</p>
</div>
<p> where a is the output gain, and dt is the change of delay time per seconds.</p>
</li>
<li class="listitem">
<p>These opcodes are best used in the double-precision version of Csound.</p>
</li>
</ul>
</div>
<p>
</p>
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<div class="refsect1" title="Examples">
<a id="idp51346624"></a>
<h2>Examples</h2>
<p>
Here is an example of the use of the <span class="emphasis"><em>vdelayx</em></span> opcode. It uses the file <a class="ulink" href="examples/vdelayx.csd" target="_top"><em class="citetitle">vdelayx.csd</em></a>.
</p>
<div class="example">
<a id="idp51347824"></a>
<p class="title">
<strong>Example 937. Example of the <span class="emphasis"><em>vdelayx</em></span> opcode.</strong>
</p>
<div class="example-contents">
<p>See the sections <a class="link" href="UsingRealTime.html" title="Real-Time Audio"><em class="citetitle">Real-time Audio</em></a> and <a class="link" href="CommandFlags.html" title="Csound command line"><em class="citetitle">Command Line Flags</em></a> for more information on using command line flags.</p>
<pre class="programlisting">
<span class="csdtag"><CsoundSynthesizer></span>
<span class="csdtag"><CsOptions></span>
<span class="comment">; Select audio/midi flags here according to platform</span>
-odac <span class="comment">;;;realtime audio out</span>
<span class="comment">;-iadc ;;;uncomment -iadc if realtime audio input is needed too</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o vdelayx.wav -W ;;; for file output any platform</span>
<span class="csdtag"></CsOptions></span>
<span class="csdtag"><CsInstruments></span>
<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">ksmps</span> <span class="op">=</span> 32
<span class="ohdr">nchnls</span> <span class="op">=</span> 2
<span class="ohdr">0dbfs</span> <span class="op">=</span> 1
<span class="oblock">instr</span> 1
ims <span class="op">=</span> .5 <span class="comment">;maximum delay time in seconds</span>
iws <span class="op">=</span> 1024 <span class="comment">;window size</span>
adl <span class="op">=</span> .5 <span class="comment">;delay time</span>
asig <span class="opc">diskin2</span> "fox.wav", 1, 0, 1 <span class="comment">;loop fox.wav</span>
a2 <span class="opc">poscil</span> .2, .2, 1 <span class="comment">;make an LFO</span>
adl <span class="op">=</span> a2 <span class="op">+</span> ims<span class="op">/</span>2 <span class="comment">;offset the LFO so that it is positive</span>
aout <span class="opc">vdelayx</span> asig, adl, ims, iws <span class="comment">;use the LFO to control delay time</span>
<span class="opc">outs</span> aout, aout
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">f</span>1 0 8192 10 1
<span class="stamnt">i</span> 1 0 10
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
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</div>
<p><br class="example-break" />
</p>
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<div class="refsect1" title="See Also">
<a id="idp51350312"></a>
<h2>See Also</h2>
<p>
<a class="link" href="vdelayxq.html" title="vdelayxq"><em class="citetitle">vdelayxq</em></a>,
<a class="link" href="vdelayxs.html" title="vdelayxs"><em class="citetitle">vdelayxs</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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