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<section id="granulation-py-full-control-granular-synthesis">
<h1>04-granulation.py - Full control granular synthesis.<a class="headerlink" href="#granulation-py-full-control-granular-synthesis" title="Permalink to this heading">¶</a></h1>
<p>The output of a Granular Synthesis is composed of many individual
grains of sound. A grain is a short chunk of sound, typically between
10 and 100 ms (but can also vary outside this range), with an amplitude
envelope in the shape of a bell curve. The sonic quality of a granular
texture is a result of the distribution of grains in time and of the
parameters selected for the synthesis of each grain.</p>
<p>This example shows the usage of the most featured granulation object
of the library!</p>
<p>Available granulation objects, in order of complexity, are:</p>
<ul class="simple">
<li><p>Granulator</p></li>
<li><p>Granule</p></li>
<li><p>Particle</p></li>
<li><p>Particle2</p></li>
</ul>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">from</span> <a class="sphinx-codeautolink-a" href="../../api/alphabetical.html#module-pyo" title="pyo"><span class="nn">pyo</span></a> <span class="kn">import</span> <span class="o">*</span>
<span class="n">s</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/server.html#pyo.Server" title="pyo.lib.server.Server"><span class="n">Server</span></a><span class="p">()</span><span class="o">.</span><span class="n">boot</span><span class="p">()</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/tables.html#pyo.SndTable" title="pyo.lib.tables.SndTable"><span class="n">snd</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/tables.html#pyo.SndTable" title="pyo.lib.tables.SndTable"><span class="n">SndTable</span></a><span class="p">(</span><span class="s2">"../snds/baseballmajeur_m.aif"</span><span class="p">)</span>
<span class="n">snd</span><span class="o">.</span><span class="n">view</span><span class="p">()</span>
<span class="c1"># Remove sr/4 samples to the size of the table, just to be sure</span>
<span class="c1"># that the reading pointer never exceeds the end of the table.</span>
<span class="n">end</span> <span class="o">=</span> <span class="n">snd</span><span class="o">.</span><span class="n">getSize</span><span class="p">()</span> <span class="o">-</span> <span class="n">s</span><span class="o">.</span><span class="n">getSamplingRate</span><span class="p">()</span> <span class="o">*</span> <span class="mf">0.25</span>
<span class="c1"># A Tuckey envelope for the grains (also known as flat-top envelope).</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/tables.html#pyo.WinTable" title="pyo.lib.tables.WinTable"><span class="n">env</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/tables.html#pyo.WinTable" title="pyo.lib.tables.WinTable"><span class="n">WinTable</span></a><span class="p">(</span><span class="mi">7</span><span class="p">)</span>
<span class="n">env</span><span class="o">.</span><span class="n">view</span><span class="p">(</span><span class="n">title</span><span class="o">=</span><span class="s2">"Grain envelope"</span><span class="p">)</span>
<span class="c1"># The grain pitch has a default value of 1, to which we can add a</span>
<span class="c1"># randomness factor by raising the "mul" value of the Noise.</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.Noise" title="pyo.lib.generators.Noise"><span class="n">pit</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.Noise" title="pyo.lib.generators.Noise"><span class="n">Noise</span></a><span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="n">add</span><span class="o">=</span><span class="mi">1</span><span class="p">)</span>
<span class="n">pit</span><span class="o">.</span><span class="n">ctrl</span><span class="p">([</span><a class="sphinx-codeautolink-a" href="../../api/classes/map.html#pyo.SLMap" title="pyo.lib._maps.SLMap"><span class="n">SLMap</span></a><span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="s2">"lin"</span><span class="p">,</span> <span class="s2">"mul"</span><span class="p">,</span> <span class="mi">0</span><span class="p">)],</span> <span class="n">title</span><span class="o">=</span><span class="s2">"Pitch Randomness"</span><span class="p">)</span>
<span class="c1"># The grain position oscillates slowly between the beginning and</span>
<span class="c1"># the end of the table. We add a little jitter to the position to</span>
<span class="c1"># attenuate phasing artifacts when overlapping the grains.</span>
<span class="n">pososc</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.Sine" title="pyo.lib.generators.Sine"><span class="n">Sine</span></a><span class="p">(</span><span class="mf">0.05</span><span class="p">)</span><span class="o">.</span><span class="n">range</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="n">end</span><span class="p">)</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.Noise" title="pyo.lib.generators.Noise"><span class="n">posrnd</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.Noise" title="pyo.lib.generators.Noise"><span class="n">Noise</span></a><span class="p">(</span><span class="n">mul</span><span class="o">=</span><span class="mf">0.01</span><span class="p">,</span> <span class="n">add</span><span class="o">=</span><span class="mi">1</span><span class="p">)</span>
<span class="n">pos</span> <span class="o">=</span> <span class="n">pososc</span> <span class="o">*</span> <a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.Noise" title="pyo.lib.generators.Noise"><span class="n">posrnd</span></a>
<span class="c1"># The grain panoramisation is completely random.</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.Noise" title="pyo.lib.generators.Noise"><span class="n">pan</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.Noise" title="pyo.lib.generators.Noise"><span class="n">Noise</span></a><span class="p">(</span><span class="n">mul</span><span class="o">=</span><span class="mf">0.5</span><span class="p">,</span> <span class="n">add</span><span class="o">=</span><span class="mf">0.5</span><span class="p">)</span>
<span class="c1"># The grain filter center frequency choices are the first 40</span>
<span class="c1"># harmonics of a base frequency oscillating between 75 and 125 Hz.</span>
<span class="n">cf</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.Sine" title="pyo.lib.generators.Sine"><span class="n">Sine</span></a><span class="p">(</span><span class="n">freq</span><span class="o">=</span><span class="mf">0.07</span><span class="p">)</span><span class="o">.</span><span class="n">range</span><span class="p">(</span><span class="mi">75</span><span class="p">,</span> <span class="mi">125</span><span class="p">)</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/randoms.html#pyo.Choice" title="pyo.lib.randoms.Choice"><span class="n">fcf</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/randoms.html#pyo.Choice" title="pyo.lib.randoms.Choice"><span class="n">Choice</span></a><span class="p">(</span><span class="nb">list</span><span class="p">(</span><span class="nb">range</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">40</span><span class="p">)),</span> <span class="n">freq</span><span class="o">=</span><span class="mi">150</span><span class="p">,</span> <span class="n">mul</span><span class="o">=</span><span class="n">cf</span><span class="p">)</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/tableprocess.html#pyo.Particle2" title="pyo.lib.tableprocess.Particle2"><span class="n">grn</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/tableprocess.html#pyo.Particle2" title="pyo.lib.tableprocess.Particle2"><span class="n">Particle2</span></a><span class="p">(</span>
<span class="n">table</span><span class="o">=</span><a class="sphinx-codeautolink-a" href="../../api/classes/tables.html#pyo.SndTable" title="pyo.lib.tables.SndTable"><span class="n">snd</span></a><span class="p">,</span> <span class="c1"># The table to read.</span>
<span class="n">env</span><span class="o">=</span><a class="sphinx-codeautolink-a" href="../../api/classes/tables.html#pyo.WinTable" title="pyo.lib.tables.WinTable"><span class="n">env</span></a><span class="p">,</span> <span class="c1"># The grain envelope.</span>
<span class="n">dens</span><span class="o">=</span><span class="mi">128</span><span class="p">,</span> <span class="c1"># The density of grains per second.</span>
<span class="c1"># The next arguments are sampled at the beginning of the grain</span>
<span class="c1"># and hold their until the end of the grain.</span>
<span class="n">pitch</span><span class="o">=</span><a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.Noise" title="pyo.lib.generators.Noise"><span class="n">pit</span></a><span class="p">,</span> <span class="c1"># The pitch of the grain.</span>
<span class="n">pos</span><span class="o">=</span><span class="n">pos</span><span class="p">,</span> <span class="c1"># The position of the grain in the table.</span>
<span class="n">dur</span><span class="o">=</span><span class="mf">0.2</span><span class="p">,</span> <span class="c1"># The duration of the grain in seconds.</span>
<span class="n">dev</span><span class="o">=</span><span class="mf">0.005</span><span class="p">,</span> <span class="c1"># The maximum deviation of the start time,</span>
<span class="c1"># synchronous versus asynchronous granulation.</span>
<span class="n">pan</span><span class="o">=</span><a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.Noise" title="pyo.lib.generators.Noise"><span class="n">pan</span></a><span class="p">,</span> <span class="c1"># The pan value of the grain.</span>
<span class="n">filterfreq</span><span class="o">=</span><a class="sphinx-codeautolink-a" href="../../api/classes/randoms.html#pyo.Choice" title="pyo.lib.randoms.Choice"><span class="n">fcf</span></a><span class="p">,</span> <span class="c1"># The filter frequency of the grain.</span>
<span class="n">filterq</span><span class="o">=</span><span class="mi">20</span><span class="p">,</span> <span class="c1"># The filter Q of the grain.</span>
<span class="n">filtertype</span><span class="o">=</span><span class="mi">2</span><span class="p">,</span> <span class="c1"># The filter type of the grain.</span>
<span class="c1"># End of sampled arguments.</span>
<span class="n">chnls</span><span class="o">=</span><span class="mi">2</span><span class="p">,</span> <span class="c1"># The output number of streams of the granulator.</span>
<span class="n">mul</span><span class="o">=</span><span class="mf">0.2</span><span class="p">,</span>
<span class="p">)</span>
<span class="n">grn</span><span class="o">.</span><span class="n">ctrl</span><span class="p">()</span>
<span class="c1"># Some grains can be surprisingly loud so we compress the output of the granulator.</span>
<span class="n">comp</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/dynamics.html#pyo.Compress" title="pyo.lib.dynamics.Compress"><span class="n">Compress</span></a><span class="p">(</span><a class="sphinx-codeautolink-a" href="../../api/classes/tableprocess.html#pyo.Particle2" title="pyo.lib.tableprocess.Particle2"><span class="n">grn</span></a><span class="p">,</span> <span class="n">thresh</span><span class="o">=-</span><span class="mi">20</span><span class="p">,</span> <span class="n">ratio</span><span class="o">=</span><span class="mi">4</span><span class="p">,</span> <span class="n">risetime</span><span class="o">=</span><span class="mf">0.005</span><span class="p">,</span> <span class="n">falltime</span><span class="o">=</span><span class="mf">0.10</span><span class="p">,</span> <span class="n">knee</span><span class="o">=</span><span class="mf">0.5</span><span class="p">,</span> <span class="n">mul</span><span class="o">=</span><span class="mi">2</span><span class="p">)</span><span class="o">.</span><span class="n">out</span><span class="p">()</span>
<span class="n">s</span><span class="o">.</span><span class="n">gui</span><span class="p">(</span><span class="nb">locals</span><span class="p">())</span>
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