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<section id="vocoder-py-analysis-resynthesis-vocoder-effect">
<h1>06-vocoder.py - Analysis/resynthesis vocoder effect.<a class="headerlink" href="#vocoder-py-analysis-resynthesis-vocoder-effect" title="Permalink to this heading">¶</a></h1>
<p>A vocoder is an analysis/resynthesis process that
uses the spectral envelope of a first sound to shape
the spectrum of a second sound. Usually (for the best
results) the first sound should present a dynamic
spectrum (for both frequencies and amplitudes) and the
second sound should contain a rich and stable spectrum.</p>
<p>In this example, LFOs are applied to every dynamic argument
of the Vocoder object to show the range of sound effects
the user can get with a vocoder.</p>
<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="kn">from</span> <span class="nn">random</span> <span class="kn">import</span> <span class="n">random</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>

<span class="c1"># First sound - dynamic spectrum.</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/players.html#pyo.SfPlayer" title="pyo.lib.players.SfPlayer"><span class="n">spktrm</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/players.html#pyo.SfPlayer" title="pyo.lib.players.SfPlayer"><span class="n">SfPlayer</span></a><span class="p">(</span><span class="s2">"../snds/baseballmajeur_m.aif"</span><span class="p">,</span> <span class="n">speed</span><span class="o">=</span><span class="p">[</span><span class="mi">1</span><span class="p">,</span> <span class="mf">1.001</span><span class="p">],</span> <span class="n">loop</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span>

<span class="c1"># Second sound - rich and stable spectrum.</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.Noise" title="pyo.lib.generators.Noise"><span class="n">excite</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="mf">0.2</span><span class="p">)</span>

<span class="c1"># LFOs to modulate every parameters of the Vocoder object.</span>
<span class="n">lf1</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">0.1</span><span class="p">,</span> <span class="n">phase</span><span class="o">=</span><span class="n">random</span><span class="p">())</span><span class="o">.</span><span class="n">range</span><span class="p">(</span><span class="mi">60</span><span class="p">,</span> <span class="mi">100</span><span class="p">)</span>
<span class="n">lf2</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">0.11</span><span class="p">,</span> <span class="n">phase</span><span class="o">=</span><span class="n">random</span><span class="p">())</span><span class="o">.</span><span class="n">range</span><span class="p">(</span><span class="mf">1.05</span><span class="p">,</span> <span class="mf">1.5</span><span class="p">)</span>
<span class="n">lf3</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="n">phase</span><span class="o">=</span><span class="n">random</span><span class="p">())</span><span class="o">.</span><span class="n">range</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="n">lf4</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">0.06</span><span class="p">,</span> <span class="n">phase</span><span class="o">=</span><span class="n">random</span><span class="p">())</span><span class="o">.</span><span class="n">range</span><span class="p">(</span><span class="mf">0.01</span><span class="p">,</span> <span class="mf">0.99</span><span class="p">)</span>

<span class="n">voc</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/filters.html#pyo.Vocoder" title="pyo.lib.filters.Vocoder"><span class="n">Vocoder</span></a><span class="p">(</span><a class="sphinx-codeautolink-a" href="../../api/classes/players.html#pyo.SfPlayer" title="pyo.lib.players.SfPlayer"><span class="n">spktrm</span></a><span class="p">,</span> <a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.Noise" title="pyo.lib.generators.Noise"><span class="n">excite</span></a><span class="p">,</span> <span class="n">freq</span><span class="o">=</span><span class="n">lf1</span><span class="p">,</span> <span class="n">spread</span><span class="o">=</span><span class="n">lf2</span><span class="p">,</span> <span class="n">q</span><span class="o">=</span><span class="n">lf3</span><span class="p">,</span> <span class="n">slope</span><span class="o">=</span><span class="n">lf4</span><span class="p">,</span> <span class="n">stages</span><span class="o">=</span><span class="mi">32</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>
</pre></div>
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