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<h2>
<span class="refentrytitle">vdelay3</span>
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<p>vdelay3 —
A variable time delay with cubic interpolation.
</p>
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<div class="refsect1">
<a id="idm281472873964104"></a>
<h2>Description</h2>
<p>
<span class="emphasis"><em>vdelay3</em></span> is experimental. It is the same as <a class="link" href="vdelay.html" title="vdelay"><em class="citetitle">vdelay</em></a> except that it uses cubic interpolation. (New in Version 3.50.)
</p>
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<div class="refsect1">
<a id="idm281472873959464"></a>
<h2>Syntax</h2>
<pre class="synopsis">ares <span class="command"><strong>vdelay3</strong></span> asig, adel, imaxdel [, iskip]</pre>
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<div class="refsect1">
<a id="idm281472873957240"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>imaxdel</em></span> -- Maximum value of delay in milliseconds. If <span class="emphasis"><em>adel</em></span> gains a value greater than <span class="emphasis"><em>imaxdel</em></span> it is folded around <span class="emphasis"><em>imaxdel</em></span>. This should not happen.
</p>
<p>
<span class="emphasis"><em>iskip</em></span> (optional) -- Skip initialization if present and non-zero.
</p>
</div>
<div class="refsect1">
<a id="idm281472873882008"></a>
<h2>Performance</h2>
<p>
With this unit generator it is possible to do Doppler effects or chorusing and flanging.
</p>
<p>
<span class="emphasis"><em>asig</em></span> -- Input signal.
</p>
<p>
<span class="emphasis"><em>adel</em></span> -- Current value of delay in milliseconds. Note that linear functions have no pitch change effects. Fast changing values of <span class="emphasis"><em>adel</em></span> will cause discontinuities in the waveform resulting noise.
</p>
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<div class="refsect1">
<a id="idm281472873878440"></a>
<h2>Examples</h2>
<p>
Here is an example of the vdelay3 opcode. It uses the file <a class="ulink" href="examples/vdelay3.csd" target="_top"><em class="citetitle">vdelay3.csd</em></a>.
</p>
<div class="example">
<a id="idm281472873876584"></a>
<p class="title">
<strong>Example 1068. Example of the vdelay3 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="idm281472694152536"></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 vdelay3.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">2</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="mi">100</span> <span class="c1">;maximum delay time in msec</span>
a<span class="n">out</span> <span class="nb">poscil</span> <span class="mf">.8</span><span class="p">,</span> <span class="mi">220</span><span class="p">,</span> <span class="mi">1</span> <span class="c1">;make a signal</span>
a<span class="n">2</span> <span class="nb">poscil</span> i<span class="n">ms</span><span class="o">/</span><span class="mi">2</span><span class="p">,</span> <span class="mi">1</span><span class="o">/</span><span class="nb">p3</span><span class="p">,</span> <span class="mi">1</span> <span class="c1">;make an LFO</span>
a<span class="n">2</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">sig</span> <span class="nb">vdelay3</span> a<span class="n">out</span><span class="p">,</span> a<span class="n">2</span><span class="p">,</span> i<span class="n">ms</span> <span class="c1">;use the LFO to control delay time</span>
<span class="nb">outs</span> a<span class="n">sig</span><span class="p">,</span> a<span class="n">sig</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">5</span>
<span class="nb">e</span>
<span class="nt"></CsScore></span>
<span class="nt"></CsoundSynthesizer></span>
</pre>
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<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="idm281472873872152"></a>
<h2>See Also</h2>
<p>
<a class="link" href="vdelay.html" title="vdelay"><em class="citetitle">vdelay</em></a>
</p>
</div>
<div class="refsect1">
<a id="idm281472873870104"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Paris Smaragdis</td>
</tr>
<tr>
<td>MIT, Cambridge</td>
</tr>
<tr>
<td>1995</td>
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