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<h2>
<span class="refentrytitle">fold</span>
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<p>fold —
Adds artificial foldover to an audio signal.
</p>
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<div class="refsect1" title="Description">
<a id="idp23948280"></a>
<h2>Description</h2>
<p>
Adds artificial foldover to an audio signal.
</p>
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<div class="refsect1" title="Syntax">
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<h2>Syntax</h2>
<pre class="synopsis">ares <span class="command"><strong>fold</strong></span> asig, kincr</pre>
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<div class="refsect1" title="Performance">
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<h2>Performance</h2>
<p>
<span class="emphasis"><em>asig</em></span> -- input signal
</p>
<p>
<span class="emphasis"><em>kincr</em></span> -- amount of foldover expressed in multiple of sampling rate. Must be >= 1
</p>
<p>
<span class="emphasis"><em>fold</em></span> is an opcode which creates artificial foldover. For example, when <span class="emphasis"><em>kincr</em></span> is equal to 1 with sr=44100, no foldover is added. When <span class="emphasis"><em>kincr</em></span> is set to 2, the foldover is equivalent to a downsampling to 22050, when it is set to 4, to 11025 etc. Fractional values of <span class="emphasis"><em>kincr</em></span> are possible, allowing a continuous variation of foldover amount. This can be used for a wide range of special effects.
</p>
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<div class="refsect1" title="Examples">
<a id="idp24039128"></a>
<h2>Examples</h2>
<p>
Here is an example of the fold opcode. It uses the file <a class="ulink" href="examples/fold.csd" target="_top"><em class="citetitle">fold.csd</em></a>.
</p>
<div class="example">
<a id="idp24040104"></a>
<p class="title">
<strong>Example 285. Example of the fold 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 fold.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
asig <span class="opc">poscil3</span> .8, 400, 1 <span class="comment">;very clean sine</span>
kincr <span class="opc">line</span> p4, p3, p5
asig <span class="opc">fold</span> asig, kincr
<span class="opc">outs</span> asig, asig
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="comment">;sine wave.</span>
<span class="stamnt">f</span> 1 0 16384 10 1
<span class="stamnt">i</span> 1 0 4 2 2
<span class="stamnt">i</span> 1 5 4 5 5
<span class="stamnt">i</span> 1 10 4 10 10
<span class="stamnt">i</span> 1 15 4 1 100 <span class="comment">; Vary the fold-over amount from 1 to 100</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" />
</p>
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<div class="refsect1" title="Credits">
<a id="idp24042400"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Gabriel Maldonado</td>
</tr>
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<td>Italy</td>
</tr>
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<td>1999</td>
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<p>
</p>
<p>New in Csound version 3.56</p>
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