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<div class="refentry">
<a id="fractalnoise"></a>
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<div class="refnamediv">
<h2>
<span class="refentrytitle">fractalnoise</span>
</h2>
<p>fractalnoise —
A fractal noise generator.
</p>
</div>
<div class="refsect1">
<a id="idm281472929102376"></a>
<h2>Description</h2>
<p>
A fractal noise generator implemented as a white noise filtered
by a cascade of 15 first-order filters.
</p>
</div>
<div class="refsect1">
<a id="idm281472929041528"></a>
<h2>Syntax</h2>
<pre class="synopsis">ares <span class="command"><strong>fractalnoise</strong></span> kamp, kbeta</pre>
</div>
<div class="refsect1">
<a id="idm281472929039320"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>kamp</em></span> -- amplitude.
</p>
<p>
<span class="emphasis"><em>kbeta</em></span> -- spectral parameter related to the fractal dimension
</p>
<div class="itemizedlist">
<ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
<p>0 - white</p>
</li>
<li class="listitem">
<p>1 - pink</p>
</li>
<li class="listitem">
<p>2 - brown</p>
</li>
</ul>
</div>
<p>
</p>
</div>
<div class="refsect1">
<a id="idm281472929034648"></a>
<h2>Examples</h2>
<p>
Here is an example of the fractalnoise opcode. It uses the file <a class="ulink" href="examples/fractalnoise.csd" target="_top"><em class="citetitle">fractalnoise.csd</em></a>.
</p>
<div class="example">
<a id="idm281472929032904"></a>
<p class="title">
<strong>Example 351. Example of the fractalnoise 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="idm281472759702664"></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 oscil.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>
k<span class="n">beta</span> <span class="nb">linseg</span> <span class="mi">0</span><span class="p">,</span> <span class="nb">p3</span><span class="o">/</span><span class="mi">4</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="nb">p3</span><span class="o">/</span><span class="mi">4</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="nb">p3</span><span class="o">*</span><span class="mf">0.1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="nb">p3</span><span class="o">*</span><span class="mf">0.15</span><span class="p">,</span> <span class="mi">0</span>
<span class="nb">seed</span> <span class="mi">20120124</span>
a<span class="n">out</span> <span class="nb">fractalnoise</span> <span class="mf">0.05</span><span class="p">,</span> k<span class="n">beta</span>
<span class="nb">outs</span> a<span class="n">out</span><span class="p">,</span> a<span class="n">out</span>
<span class="kd">endin</span>
<span class="nt"></CsInstruments></span>
<span class="nt"><CsScore></span>
<span class="nb">i</span><span class="mi">1</span> <span class="mi">0</span> <span class="mi">10</span>
<span class="nb">e</span>
<span class="nt"></CsScore></span>
<span class="nt"></CsoundSynthesizer></span>
</pre>
</div>
</div>
</div>
<p><br class="example-break" />
</p>
</div>
<div class="refsect1">
<a id="idm281472929028680"></a>
<h2>References</h2>
<p>
</p>
<div class="orderedlist">
<ol class="orderedlist" type="1">
<li class="listitem">
<p>
R. Saletti. A comparison between two methods to generate
1/(f^gamma) noise. In Proc. IEEE, volume 74,
pp. 1595-1596, November 1986.
</p>
</li>
<li class="listitem">
<p>
G. Corsini and R. Saletti. A 1/(f^gamma) power spectrum
noise sequence generator. IEEE Trans. on Instrumentation
and Measurement, 37(4):615-619, December 1988.
</p>
</li>
<li class="listitem">
<p>
The Sounding Object, edited by Davide Rocchesso and
Federico Fontana, Edizioni di Mondo Estremo. Chapter 8 by
Federico Avanzini, pp. 154-157.
</p>
</li>
</ol>
</div>
<p>
</p>
</div>
<div class="refsect1">
<a id="idm281472929023416"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Tito Latini</td>
</tr>
<tr>
<td>January 2012</td>
</tr>
</table>
<p>
</p>
<p>New in Csound version 5.16</p>
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