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<h2>
<span class="refentrytitle">vdelayxq</span>
</h2>
<p>vdelayxq —
A 4-channel variable delay opcode with high quality interpolation.
</p>
</div>
<div class="refsect1">
<a id="idm281472873829256"></a>
<h2>Description</h2>
<p>
A 4-channel variable delay opcode with high quality interpolation.
</p>
</div>
<div class="refsect1">
<a id="idm281472873761080"></a>
<h2>Syntax</h2>
<pre class="synopsis">aout1, aout2, aout3, aout4 <span class="command"><strong>vdelayxq</strong></span> ain1, ain2, ain3, ain4, adl, imd, iws [, ist]</pre>
</div>
<div class="refsect1">
<a id="idm281472873758888"></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">
<a id="idm281472873755608"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>aout1, aout2, aout3, aout4</em></span> -- output audio signals.
</p>
<p>
<span class="emphasis"><em>ain1, ain2, ain3, ain4</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.
</p>
<div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
<table border="0" summary="Note: Notes">
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<td rowspan="2" align="center" valign="top" width="25">
<img alt="[Note]" src="images/note.png" />
</td>
<th align="left">Notes</th>
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<td align="left" valign="top">
<p>
</p>
<div class="itemizedlist">
<ul class="itemizedlist" style="list-style-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>
</td>
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<div class="refsect1">
<a id="idm281472873744568"></a>
<h2>Examples</h2>
<p>
Here is an example of the vdelayxq opcode. It uses the file <a class="ulink" href="examples/vdelayxq.csd" target="_top"><em class="citetitle">vdelayxq.csd</em></a>.
</p>
<div class="example">
<a id="idm281472873742712"></a>
<p class="title">
<strong>Example 1070. Example of the vdelayxq 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>
<div class="refsect1">
<a id="idm281472694023512"></a>
<pre class="programlisting">
<span class="nt"><CsoundSynthesizer></span>
<span class="nt"><CsOptions></span>
<span class="c1">; Select audio/midi flags here according to platform</span>
-odac <span class="c1">;;;realtime audio out</span>
<span class="c1">;-iadc ;;;uncomment -iadc if realtime audio input is needed too</span>
<span class="c1">; For Non-realtime ouput leave only the line below:</span>
<span class="c1">; -o vdelayxq.wav -W ;;; for file output any platform</span>
<span class="nt"></CsOptions></span>
<span class="nt"><CsInstruments></span>
<span class="vg">sr</span> <span class="o">=</span> <span class="mi">44100</span>
<span class="vg">ksmps</span> <span class="o">=</span> <span class="mi">32</span>
<span class="vg">nchnls</span> <span class="o">=</span> <span class="mi">4</span>
<span class="vg">0dbfs</span> <span class="o">=</span> <span class="mi">1</span>
<span class="kd">instr</span> <span class="nf">1</span>
i<span class="n">ms</span> <span class="o">=</span> <span class="mf">.5</span> <span class="c1">;maximum delay time in seconds</span>
i<span class="n">ws</span> <span class="o">=</span> <span class="mi">1024</span> <span class="c1">;window size</span>
a<span class="n">dl</span> <span class="o">=</span> <span class="mf">.5</span>
a<span class="n">out1</span> <span class="nb">diskin2</span> <span class="s">"beats.wav"</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">1</span> <span class="c1">;loop beats.wav</span>
a<span class="n">out2</span> <span class="nb">diskin2</span> <span class="s">"fox.wav"</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">1</span> <span class="c1">;loop fox.wav</span>
a<span class="n">out3</span> <span class="nb">diskin2</span> <span class="s">"Church.wav"</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">1</span> <span class="c1">;loop Church.wav</span>
a<span class="n">out4</span> <span class="nb">diskin2</span> <span class="s">"flute.aiff"</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">1</span> <span class="c1">;loop flute.aiff</span>
a<span class="n">2</span> <span class="nb">poscil</span> <span class="mf">.1</span><span class="p">,</span> <span class="mf">.5</span><span class="p">,</span> <span class="mi">1</span> <span class="c1">;make an LFO, 1 cycle per 2 seconds</span>
a<span class="n">dl</span> <span class="o">=</span> a<span class="n">2</span> <span class="o">+</span> i<span class="n">ms</span><span class="o">/</span><span class="mi">2</span> <span class="c1">;offset the LFO so that it is positive</span>
a<span class="n">out1</span><span class="p">,</span> a<span class="n">out2</span><span class="p">,</span> a<span class="n">out3</span><span class="p">,</span> a<span class="n">out4</span> <span class="nb">vdelayxq</span> a<span class="n">out1</span><span class="p">,</span> a<span class="n">out2</span><span class="p">,</span> a<span class="n">out3</span><span class="p">,</span> a<span class="n">out4</span><span class="p">,</span> a<span class="n">dl</span><span class="p">,</span> i<span class="n">ms</span><span class="p">,</span> i<span class="n">ws</span><span class="c1">; Use the LFO to control delay time</span>
<span class="nb">outq</span> a<span class="n">out1</span><span class="p">,</span> a<span class="n">out2</span><span class="p">,</span> a<span class="n">out3</span><span class="p">,</span> a<span class="n">out4</span>
<span class="kd">endin</span>
<span class="nt"></CsInstruments></span>
<span class="nt"><CsScore></span>
<span class="nb">f</span><span class="mi">1</span> <span class="mi">0</span> <span class="mi">8192</span> <span class="mi">10</span> <span class="mi">1</span>
<span class="nb">i</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mi">10</span>
<span class="nb">e</span>
<span class="nt"></CsScore></span>
<span class="nt"></CsoundSynthesizer></span>
</pre>
</div>
</div>
</div>
<p><br class="example-break" />
Two important points here. First, the delay time must be always positive. And second, even though the delay time can be controlled in k-rate, it is not advised to do so, since sudden time changes will create clicks.
</p>
</div>
<div class="refsect1">
<a id="idm281472873738184"></a>
<h2>See Also</h2>
<p>
<a class="link" href="vdelayx.html" title="vdelayx"><em class="citetitle">vdelayx</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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