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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">
<a id="idm281472929920344"></a>
<h2>Description</h2>
<p>
Adds artificial foldover to an audio signal.
</p>
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<div class="refsect1">
<a id="idm281472929919064"></a>
<h2>Syntax</h2>
<pre class="synopsis">ares <span class="command"><strong>fold</strong></span> asig, kincr</pre>
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<div class="refsect1">
<a id="idm281472929916824"></a>
<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">
<a id="idm281472929911560"></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="idm281472929909704"></a>
<p class="title">
<strong>Example 337. 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>
<div class="refsect1">
<a id="idm281472761069256"></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">;;;realtime audio out</span>
<span class="c1">;-iadc ;;;uncomment -iadc if realtime audio input is needed too</span>
<span class="c1">; For Non-realtime ouput leave only the line below:</span>
<span class="c1">; -o fold.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">sig</span> <span class="nb">poscil3</span> <span class="mf">.8</span><span class="p">,</span> <span class="mi">400</span><span class="p">,</span> <span class="mi">1</span> <span class="c1">;very clean sine</span>
k<span class="n">incr</span> <span class="nb">line</span> <span class="nb">p4</span><span class="p">,</span> <span class="nb">p3</span><span class="p">,</span> <span class="nb">p5</span>
a<span class="n">sig</span> <span class="nb">fold</span> a<span class="n">sig</span><span class="p">,</span> k<span class="n">incr</span>
<span class="nb">outs</span> a<span class="n">sig</span><span class="p">,</span> a<span class="n">sig</span>
<span class="kd">endin</span>
<span class="nt"></CsInstruments></span>
<span class="nt"><CsScore></span>
<span class="c1">;sine wave.</span>
<span class="nb">f</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mi">16384</span> <span class="mi">10</span> <span class="mi">1</span>
<span class="nb">i</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mi">4</span> <span class="mi">2</span> <span class="mi">2</span>
<span class="nb">i</span> <span class="mi">1</span> <span class="mi">5</span> <span class="mi">4</span> <span class="mi">5</span> <span class="mi">5</span>
<span class="nb">i</span> <span class="mi">1</span> <span class="mi">10</span> <span class="mi">4</span> <span class="mi">10</span> <span class="mi">10</span>
<span class="nb">i</span> <span class="mi">1</span> <span class="mi">15</span> <span class="mi">4</span> <span class="mi">1</span> <span class="mi">100</span> <span class="c1">; Vary the fold-over amount from 1 to 100</span>
<span class="nb">e</span>
<span class="nt"></CsScore></span>
<span class="nt"></CsoundSynthesizer></span>
</pre>
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</div>
<p><br class="example-break" />
</p>
</div>
<div class="refsect1">
<a id="idm281472929905480"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Gabriel Maldonado</td>
</tr>
<tr>
<td>Italy</td>
</tr>
<tr>
<td>1999</td>
</tr>
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<p>
</p>
<p>New in Csound version 3.56</p>
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