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<div class="refentry" title="gendyc">
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<a id="IndexGendyc" class="indexterm"></a>
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<h2>
<span class="refentrytitle">gendyc</span>
</h2>
<p>gendyc —
Dynamic stochastic approach to waveform synthesis using cubic interpolation.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp25237032"></a>
<h2>Description</h2>
<p>
Implementation with cubic interpolation of the
<span class="emphasis"><em>Génération Dynamique Stochastique</em></span> (GENDYN),
a dynamic stochastic approach to waveform synthesis conceived by
Iannis Xenakis.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp25238088"></a>
<h2>Syntax</h2>
<pre class="synopsis">ares <span class="command"><strong>gendyc</strong></span> kamp, kampdist, kdurdist, kadpar, kddpar, kminfreq, kmaxfreq, \
kampscl, kdurscl [, initcps] [, knum]</pre>
<pre class="synopsis">kres <span class="command"><strong>gendyc</strong></span> kamp, kampdist, kdurdist, kadpar, kddpar, kminfreq, kmaxfreq, \
kampscl, kdurscl [, initcps] [, knum]</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp25271784"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>initcps</em></span> (optional, default=12) -- max number of
control points.
</p>
</div>
<div class="refsect1" title="Performance">
<a id="idp25272664"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>kamp</em></span> -- amplitude.
</p>
<p>
<span class="emphasis"><em>kampdist</em></span> -- choice of probability
distribution for the next perturbation of the amplitude of a
control point. The valid distributions are:
</p>
<div class="itemizedlist">
<ul class="itemizedlist" type="disc">
<li class="listitem">
<p>0 - LINEAR</p>
</li>
<li class="listitem">
<p>1 - CAUCHY</p>
</li>
<li class="listitem">
<p>2 - LOGIST</p>
</li>
<li class="listitem">
<p>3 - HYPERBCOS</p>
</li>
<li class="listitem">
<p>4 - ARCSINE</p>
</li>
<li class="listitem">
<p>5 - EXPON</p>
</li>
<li class="listitem">
<p>6 - SINUS (external k-rate signal)</p>
</li>
</ul>
</div>
<p>
If <span class="emphasis"><em>kampdist</em></span>=6, the user can use an external
k-rate signal through <span class="emphasis"><em>kadpar</em></span>.
</p>
<p>
<span class="emphasis"><em>kdurdist</em></span> -- choice of distribution for the
perturbation of the current inter control point
duration. See <span class="emphasis"><em>kampdist</em></span> for the valid distributions.
If <span class="emphasis"><em>kdurdist</em></span>=6, the user can use an external
k-rate signal through <span class="emphasis"><em>kddpar</em></span>.
</p>
<p>
<span class="emphasis"><em>kadpar</em></span> -- parameter for the <span class="emphasis"><em>kampdist</em></span>
distribution. Should be in the range of 0.0001 to 1.
</p>
<p>
<span class="emphasis"><em>kddpar</em></span> -- parameter for the <span class="emphasis"><em>kdurdist</em></span>
distribution. Should be in the range of 0.0001 to 1.
</p>
<p>
<span class="emphasis"><em>kminfreq</em></span> -- minimum allowed frequency of oscillation.
</p>
<p>
<span class="emphasis"><em>kmaxfreq</em></span> -- maximum allowed frequency of oscillation.
</p>
<p>
<span class="emphasis"><em>kampscl</em></span> -- multiplier for the
distribution's delta value for amplitude (1.0 is full range).
</p>
<p>
<span class="emphasis"><em>kdurscl</em></span> -- multiplier for the distribution's delta value for duration.
</p>
<p>
<span class="emphasis"><em>knum</em></span> (optional,
default=<span class="emphasis"><em>initcps</em></span>) -- current number of utilized control points.
</p>
<p>
The waveform is generated by <span class="emphasis"><em>knum</em></span> - 1
segments and is repeated in the time. The vertexes (control points)
are moved according to a stochastic action and they are limited
within the boundaries of a mirror formed by an amplitude barrier
and a time barrier.
</p>
</div>
<div class="refsect1" title="Examples">
<a id="idp25282720"></a>
<h2>Examples</h2>
<p>
Here is an example of the gendyc opcode. It uses the file
<a class="ulink" href="examples/gendyc.csd" target="_top"><em class="citetitle">gendyc.csd</em></a>.
</p>
<div class="example">
<a id="idp25283696"></a>
<p class="title">
<strong>Example 323. Example of the gendyc 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 oscil.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
aout <span class="opc">gendyc</span> 0.5, 1, 1, 1, 1, 220, 440, 0.5, 0.5
<span class="opc">outs</span> aout, aout
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">i</span>1 0 10
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
</div>
<p><br class="example-break" />
</p>
</div>
<div class="refsect1" title="References">
<a id="idp25285968"></a>
<h2>References</h2>
<p>
</p>
<div class="orderedlist">
<ol class="orderedlist" type="1">
<li class="listitem">
<p>
Formalized Music (1992, Stuyvesant, NY: Pendragon Press),
pp. 246 - 254, 289 - 322.
</p>
</li>
</ol>
</div>
<p>
</p>
</div>
<div class="refsect1" title="See Also">
<a id="idp25287520"></a>
<h2>See Also</h2>
<p>
<a class="link" href="gendy.html" title="gendy"><em class="citetitle">gendy</em></a>
<a class="link" href="gendyx.html" title="gendyx"><em class="citetitle">gendyx</em></a>
</p>
</div>
<div class="refsect1" title="Credits">
<a id="idp25289016"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Based on Nick Collins's Gendy1 and Bhob Rainey's Gendy4 (SuperCollider)</td>
</tr>
<tr>
<td>Author: Tito Latini</td>
</tr>
<tr>
<td>January 2012</td>
</tr>
</table>
<p>
</p>
<p>New in Csound version 5.16</p>
</div>
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