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<section id="complex-resonator-py-filtering-by-mean-of-a-complex-multiplication">
<h1>03-complex-resonator.py - Filtering by mean of a complex multiplication.<a class="headerlink" href="#complex-resonator-py-filtering-by-mean-of-a-complex-multiplication" title="Permalink to this heading">¶</a></h1>
<p>ComplexRes implements a resonator derived from a complex
multiplication, which is very similar to a digital filter.</p>
<p>It is used here to create a rhythmic chime with varying resonance.</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">import</span> <span class="nn">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"># Six random frequencies.</span>
<span class="n">freqs</span> <span class="o">=</span> <span class="p">[</span><span class="n">random</span><span class="o">.</span><span class="n">uniform</span><span class="p">(</span><span class="mi">1000</span><span class="p">,</span> <span class="mi">3000</span><span class="p">)</span> <span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="mi">6</span><span class="p">)]</span>

<span class="c1"># Six different plucking speeds.</span>
<span class="n">pluck</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/triggers.html#pyo.Metro" title="pyo.lib.triggers.Metro"><span class="n">Metro</span></a><span class="p">([</span><span class="mf">0.9</span><span class="p">,</span> <span class="mf">0.8</span><span class="p">,</span> <span class="mf">0.6</span><span class="p">,</span> <span class="mf">0.4</span><span class="p">,</span> <span class="mf">0.3</span><span class="p">,</span> <span class="mf">0.2</span><span class="p">])</span><span class="o">.</span><span class="n">play</span><span class="p">()</span>

<span class="c1"># LFO applied to the decay of the resonator.</span>
<span class="n">decay</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">0.1</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">0.15</span><span class="p">)</span>

<span class="c1"># Six ComplexRes filters.</span>
<span class="n">rezos</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/filters.html#pyo.ComplexRes" title="pyo.lib.filters.ComplexRes"><span class="n">ComplexRes</span></a><span class="p">(</span><span class="n">pluck</span><span class="p">,</span> <span class="n">freqs</span><span class="p">,</span> <span class="n">decay</span><span class="p">,</span> <span class="n">mul</span><span class="o">=</span><span class="mi">5</span><span class="p">)</span><span class="o">.</span><span class="n">out</span><span class="p">()</span>

<span class="c1"># Change chime frequencies every 7.2 seconds</span>
<span class="k">def</span> <span class="nf">new</span><span class="p">():</span>
    <span class="n">freqs</span> <span class="o">=</span> <span class="p">[</span><span class="n">random</span><span class="o">.</span><span class="n">uniform</span><span class="p">(</span><span class="mi">1000</span><span class="p">,</span> <span class="mi">3000</span><span class="p">)</span> <span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="mi">6</span><span class="p">)]</span>
    <span class="n">rezos</span><span class="o">.</span><span class="n">freq</span> <span class="o">=</span> <span class="n">freqs</span>


<span class="n">pat</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/pattern.html#pyo.Pattern" title="pyo.lib.pattern.Pattern"><span class="n">Pattern</span></a><span class="p">(</span><span class="n">new</span><span class="p">,</span> <span class="mf">7.2</span><span class="p">)</span><span class="o">.</span><span class="n">play</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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