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<h2>
<span class="refentrytitle">delay</span>
</h2>
<p>delay —
Delays an input signal by some time interval.
</p>
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<div class="refsect1" title="Description">
<a id="idp17764904"></a>
<h2>Description</h2>
<p>
A signal can be read from or written into a delay path, or it can be automatically delayed by some time interval.
</p>
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<div class="refsect1" title="Syntax">
<a id="idp17765768"></a>
<h2>Syntax</h2>
<pre class="synopsis">ares <span class="command"><strong>delay</strong></span> asig, idlt [, iskip]</pre>
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<div class="refsect1" title="Initialization">
<a id="idp17776360"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>idlt</em></span> -- requested delay time in seconds. This can be as large as available memory will permit. The space required for n seconds of delay is 4n * <span class="emphasis"><em>sr</em></span> bytes. It is allocated at the time the instrument is first initialized, and returned to the pool at the end of a score section.
</p>
<p>
<span class="emphasis"><em>iskip</em></span> (optional, default=0) -- initial disposition of delay-loop data space (see <a class="link" href="reson.html" title="reson"><em class="citetitle">reson</em></a>). The default value is 0.
</p>
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<div class="refsect1" title="Performance">
<a id="idp17778816"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>asig</em></span> -- audio signal
</p>
<p>
<span class="emphasis"><em>delay</em></span> is a composite of <a class="link" href="delayr.html" title="delayr"><em class="citetitle">delayr</em></a> and <a class="link" href="delayw.html" title="delayw"><em class="citetitle">delayw</em></a>, both reading from and writing into its own storage area. It can thus accomplish signal time-shift, although modified feedback is not possible. There is no minimum delay period.
</p>
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<div class="refsect1" title="Examples">
<a id="idp17812080"></a>
<h2>Examples</h2>
<p>
Here is an example of the delay opcode. It uses the file <a class="ulink" href="examples/delay.csd" target="_top"><em class="citetitle">delay.csd</em></a>.
</p>
<div class="example">
<a id="idp17813056"></a>
<p class="title">
<strong>Example 159. Example of the delay 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">;;;RT audio out</span>
<span class="comment">;-iadc ;;;uncomment -iadc if RT audio input is needed too</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o delay.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
adel <span class="opc">init</span> 0
ilev <span class="op">=</span> p4 <span class="comment">;level of direct sound</span>
idelay <span class="op">=</span> p5 <span class="op">*</span>.001 <span class="comment">;Delay in ms</span>
ifd <span class="op">=</span> p6 <span class="comment">;feedback</span>
ain <span class="opc">diskin2</span> "fox.wav", 1, 1
adel <span class="opc">delay</span> ain <span class="op">+</span> (adel<span class="op">*</span>ifd), idelay<span class="comment">;ifd = amount of feedback</span>
asig <span class="opc">moogvcf</span> adel, 1500, .6, 1 <span class="comment">;color feedback</span>
<span class="opc">outs</span> asig<span class="op">*</span>ilev, ain
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="comment">;Delay is in ms</span>
<span class="stamnt">i</span> 1 0 15 2 200 .95 <span class="comment">;with feedback</span>
<span class="stamnt">i</span> 1 4 5 2 20 .95
<span class="stamnt">i</span> 1 + 3 2 5 .95
<span class="stamnt">i</span> 1 + 3 3 5 0 <span class="comment">;no feedback</span>
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
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<p><br class="example-break" />
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<div class="refsect1" title="See Also">
<a id="idp17815360"></a>
<h2>See Also</h2>
<p>
<a class="link" href="delay1.html" title="delay1"><em class="citetitle">delay1</em></a>,
<a class="link" href="delayr.html" title="delayr"><em class="citetitle">delayr</em></a>,
<a class="link" href="delayw.html" title="delayw"><em class="citetitle">delayw</em></a>
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