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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">
<a id="idm281472942734600"></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">
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<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">
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<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">
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<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">
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<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="idm281472942659880"></a>
<p class="title">
<strong>Example 191. 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>
<div class="refsect1">
<a id="idm281472775560200"></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">;;;RT audio out</span>
<span class="c1">;-iadc ;;;uncomment -iadc if RT audio input is needed too</span>
<span class="c1">; For Non-realtime ouput leave only the line below:</span>
<span class="c1">; -o delay.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>
a<span class="n">del</span> <span class="nb">init</span> <span class="mi">0</span>
i<span class="n">lev</span> <span class="o">=</span> <span class="nb">p4</span> <span class="c1">;level of direct sound</span>
i<span class="n">delay</span> <span class="o">=</span> <span class="nb">p5</span> <span class="o">*</span><span class="mf">.001</span> <span class="c1">;Delay in ms</span>
i<span class="n">fd</span> <span class="o">=</span> <span class="nb">p6</span> <span class="c1">;feedback</span>
a<span class="n">in</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">1</span>
a<span class="n">del</span> <span class="nb">delay</span> a<span class="n">in</span> <span class="o">+</span> <span class="p">(</span>a<span class="n">del</span><span class="o">*</span>i<span class="n">fd</span><span class="p">),</span> i<span class="n">delay</span><span class="c1">;ifd = amount of feedback</span>
a<span class="n">sig</span> <span class="nb">moogvcf</span> a<span class="n">del</span><span class="p">,</span> <span class="mi">1500</span><span class="p">,</span> <span class="mf">.6</span><span class="p">,</span> <span class="mi">1</span> <span class="c1">;color feedback</span>
<span class="nb">outs</span> a<span class="n">sig</span><span class="o">*</span>i<span class="n">lev</span><span class="p">,</span> a<span class="n">in</span>
<span class="kd">endin</span>
<span class="nt"></CsInstruments></span>
<span class="nt"><CsScore></span>
<span class="c1">;Delay is in ms</span>
<span class="nb">i</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mi">15</span> <span class="mi">2</span> <span class="mi">200</span> <span class="mf">.95</span> <span class="c1">;with feedback</span>
<span class="nb">i</span> <span class="mi">1</span> <span class="mi">4</span> <span class="mi">5</span> <span class="mi">2</span> <span class="mi">20</span> <span class="mf">.95</span>
<span class="nb">i</span> <span class="mi">1</span> <span class="o">+</span> <span class="mi">3</span> <span class="mi">2</span> <span class="mi">5</span> <span class="mf">.95</span>
<span class="nb">i</span> <span class="mi">1</span> <span class="o">+</span> <span class="mi">3</span> <span class="mi">3</span> <span class="mi">5</span> <span class="mi">0</span> <span class="c1">;no feedback</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" />
</p>
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<div class="refsect1">
<a id="idm281472942655560"></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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