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<span class="refentrytitle">vdelay</span>
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<p>vdelay —
An interpolating variable time delay.
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<div class="refsect1" title="Description">
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<h2>Description</h2>
<p>
This is an interpolating variable time delay, it is not very different from the existing implementation (<a class="link" href="deltapi.html" title="deltapi"><em class="citetitle">deltapi</em></a>), it is only easier to use.
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<div class="refsect1" title="Syntax">
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<h2>Syntax</h2>
<pre class="synopsis">ares <span class="command"><strong>vdelay</strong></span> asig, adel, imaxdel [, iskip]</pre>
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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.
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<p>
<span class="emphasis"><em>iskip</em></span> -- Skip initialization if present and nonzero
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<div class="refsect1" title="Performance">
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<h2>Performance</h2>
<p>
With this unit generator it is possible to do Doppler effects or chorusing and flanging.
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<p>
<span class="emphasis"><em>asig</em></span> -- Input signal.
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<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.
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<h2>Examples</h2>
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<pre class="programlisting">
<span class="stamnt">f</span>1 0 8192 10 1
ims <span class="op">=</span> 100 <span class="comment">; Maximum delay time in msec</span>
a1 <span class="opc">oscil</span> 10000, 1737, 1 <span class="comment">; Make a signal</span>
a2 <span class="opc">oscil</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>
a3 <span class="opc">vdelay</span> a1, a2, ims <span class="comment">; Use the LFO to control delay time</span>
<span class="opc">out</span> a3</pre>
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<p>
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.
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<div class="refsect1" title="See Also">
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<h2>See Also</h2>
<p>
<a class="link" href="vdelay3.html" title="vdelay3"><em class="citetitle">vdelay3</em></a>
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<div class="refsect1" title="Credits">
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<h2>Credits</h2>
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<td>Author: Paris Smaragdis</td>
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<td>MIT, Cambridge</td>
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<td>1995</td>
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