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<div class="refentry">
<a id="gendy"></a>
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<h2>
<span class="refentrytitle">gendy</span>
</h2>
<p>gendy —
Dynamic stochastic approach to waveform synthesis conceived by Iannis Xenakis.
</p>
</div>
<div class="refsect1">
<a id="idm281472927451624"></a>
<h2>Description</h2>
<p>
Implementation 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">
<a id="idm281472927387688"></a>
<h2>Syntax</h2>
<pre class="synopsis">ares <span class="command"><strong>gendy</strong></span> kamp, kampdist, kdurdist, kadpar, kddpar, kminfreq, kmaxfreq, \
kampscl, kdurscl [, initcps] [, knum]</pre>
<pre class="synopsis">kres <span class="command"><strong>gendy</strong></span> kamp, kampdist, kdurdist, kadpar, kddpar, kminfreq, kmaxfreq, \
kampscl, kdurscl [, initcps] [, knum]</pre>
</div>
<div class="refsect1">
<a id="idm281472927383944"></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">
<a id="idm281472927382344"></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" style="list-style-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 class="mediaobject">
<img src="images/gendy.png" alt="[A repetition of the generated waveform with knum=12.]" />
<div class="caption">
<p>A repetition of the generated waveform with <span class="emphasis"><em>knum</em></span>=12.</p>
</div>
</div>
<p>
</p>
</div>
<div class="refsect1">
<a id="idm281472927359496"></a>
<h2>Examples</h2>
<p>
Here is an example of the gendy opcode. It uses the file
<a class="ulink" href="examples/gendy.csd" target="_top"><em class="citetitle">gendy.csd</em></a>.
</p>
<div class="example">
<a id="idm281472927357640"></a>
<p class="title">
<strong>Example 378. Example of the gendy 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="idm281472758193176"></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>
a<span class="n">out</span> <span class="nb">gendy</span> <span class="mf">0.7</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">20</span><span class="p">,</span> <span class="mi">1000</span><span class="p">,</span> <span class="mf">0.5</span><span class="p">,</span> <span class="mf">0.5</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>
<p>
Here is an example of the gendy opcode with some modulations. It uses the file
<a class="ulink" href="examples/gendy-2.csd" target="_top"><em class="citetitle">gendy-2.csd</em></a>.
</p>
<div class="example">
<a id="idm281472927352424"></a>
<p class="title">
<strong>Example 379. Example of the gendy opcode with some modulations.</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="idm281472757350088"></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">env</span> <span class="nb">expseg</span> <span class="mf">0.01</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">1</span><span class="p">,</span> <span class="nb">p3</span><span class="o">*</span><span class="mf">0.8</span><span class="p">,</span> <span class="mi">1</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="mf">0.001</span>
k<span class="n">osc</span> <span class="nb">oscil</span> <span class="mf">0.1</span><span class="p">,</span> <span class="mi">3</span><span class="o">/</span><span class="nb">p3</span><span class="p">,</span> <span class="mi">1</span>
<span class="nb">seed</span> <span class="mi">20120123</span>
k<span class="n">dis</span> <span class="nb">bexprnd</span> k<span class="n">osc</span>
k<span class="n">num</span> <span class="nb">linseg</span> <span class="mi">3</span><span class="p">,</span> <span class="nb">p3</span><span class="o">*</span><span class="mf">0.75</span><span class="p">,</span> <span class="mi">10</span><span class="p">,</span> <span class="nb">p3</span><span class="o">*</span><span class="mf">0.20</span><span class="p">,</span> <span class="mi">12</span><span class="p">,</span> <span class="nb">p3</span><span class="o">*</span><span class="mf">0.05</span><span class="p">,</span> <span class="mi">5</span>
a<span class="n">sig</span> <span class="nb">gendy</span> <span class="mf">0.2</span><span class="p">,</span> k<span class="n">osc</span><span class="o">*</span><span class="mi">60</span><span class="p">,</span> <span class="mi">6</span><span class="p">,</span> <span class="mf">0.7</span><span class="p">,</span> k<span class="n">dis</span><span class="p">,</span> <span class="mi">500</span><span class="o">*</span>k<span class="n">env</span><span class="p">,</span> <span class="mi">4800</span><span class="p">,</span> <span class="mf">0.23</span><span class="p">,</span> <span class="mf">0.3</span><span class="p">,</span> <span class="mi">12</span><span class="p">,</span> k<span class="n">num</span>
a<span class="n">flt</span> <span class="nb">resonz</span> a<span class="n">sig</span><span class="p">,</span> <span class="mi">1400</span><span class="p">,</span> <span class="mi">400</span>
a<span class="n">out</span> <span class="nb">comb</span> k<span class="n">env</span><span class="o">*</span>a<span class="n">flt</span><span class="o">*</span><span class="mf">0.1</span><span class="p">,</span> <span class="mf">0.9</span><span class="p">,</span> <span class="mf">0.1</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">f</span><span class="mi">1</span> <span class="mi">0</span> <span class="mi">8192</span> <span class="mi">10</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mf">.8</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mf">.3</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mf">.1</span>
<span class="nb">i</span><span class="mi">1</span> <span class="mi">0</span> <span class="mi">20</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="idm281472927348216"></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">
<a id="idm281472927345272"></a>
<h2>See Also</h2>
<p>
<a class="link" href="gendyc.html" title="gendyc"><em class="citetitle">gendyc</em></a>
<a class="link" href="gendyx.html" title="gendyx"><em class="citetitle">gendyx</em></a>
</p>
</div>
<div class="refsect1">
<a id="idm281472927342232"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Based on Nick Collins's Gendy1 ugen (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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