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<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" title="Description">
<a id="idp51259640"></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" title="Syntax">
<a id="idp51308392"></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" title="Initialization">
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<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" title="Performance">
<a id="idp51311568"></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" title="Examples">
<a id="idp51313520"></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="idp51314496"></a>
<p class="title">
<strong>Example 936. 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>
<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 vdelay3.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> 100 <span class="comment">;maximum delay time in msec</span>
aout <span class="opc">poscil</span> .8, 220, 1 <span class="comment">;make a signal</span>
a2 <span class="opc">poscil</span> ims<span class="op">/</span>2, 1<span class="op">/</span>p3, 1 <span class="comment">;make an LFO</span>
a2 <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>
asig <span class="opc">vdelay3</span> aout, a2, ims <span class="comment">;use the LFO to control delay time</span>
<span class="opc">outs</span> asig, asig
<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 5
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</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>
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<div class="refsect1" title="See Also">
<a id="idp51317016"></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" title="Credits">
<a id="idp51318032"></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>
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<td>1995</td>
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