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<section id="phasing-py-the-phasing-effect">
<h1>04-phasing.py - The phasing effect.<a class="headerlink" href="#phasing-py-the-phasing-effect" title="Permalink to this heading">¶</a></h1>
<p>The Phaser object implements a variable number of second-order
allpass filters, allowing to quickly build complex phasing effects.</p>
<blockquote>
<div><p>A phaser is an electronic sound processor used to filter a signal
by creating a series of peaks and troughs in the frequency spectrum.
The position of the peaks and troughs of the waveform being affected
is typically modulated so that they vary over time, creating a sweeping
effect. For this purpose, phasers usually include a low-frequency
oscillator. - <a class="reference external" href="https://en.wikipedia.org/wiki/Phaser_(effect">https://en.wikipedia.org/wiki/Phaser_(effect</a>)</p>
</div></blockquote>
<p>A phase shifter unit can be built from scratch with the Allpass2 object,
which implement a second-order allpass filter that create, when added to
the original source, one notch in the spectrum.</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="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"># Simple fadein.</span>
<span class="n">fade</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/controls.html#pyo.Fader" title="pyo.lib.controls.Fader"><span class="n">Fader</span></a><span class="p">(</span><span class="n">fadein</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="mf">0.2</span><span class="p">)</span><span class="o">.</span><span class="n">play</span><span class="p">()</span>
<span class="c1"># Noisy source.</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.PinkNoise" title="pyo.lib.generators.PinkNoise"><span class="n">a</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.PinkNoise" title="pyo.lib.generators.PinkNoise"><span class="n">PinkNoise</span></a><span class="p">(</span><span class="n">fade</span><span class="p">)</span>
<span class="c1"># These LFOs modulate the `freq`, `spread` and `q` arguments of</span>
<span class="c1"># the Phaser object. We give a list of two frequencies in order</span>
<span class="c1"># to create two-streams LFOs, therefore a stereo phasing effect.</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.Sine" title="pyo.lib.generators.Sine"><span class="n">lf1</span></a> <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="p">[</span><span class="mf">0.1</span><span class="p">,</span> <span class="mf">0.15</span><span class="p">],</span> <span class="n">mul</span><span class="o">=</span><span class="mi">100</span><span class="p">,</span> <span class="n">add</span><span class="o">=</span><span class="mi">250</span><span class="p">)</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.Sine" title="pyo.lib.generators.Sine"><span class="n">lf2</span></a> <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="p">[</span><span class="mf">0.18</span><span class="p">,</span> <span class="mf">0.13</span><span class="p">],</span> <span class="n">mul</span><span class="o">=</span><span class="mf">0.4</span><span class="p">,</span> <span class="n">add</span><span class="o">=</span><span class="mf">1.5</span><span class="p">)</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.Sine" title="pyo.lib.generators.Sine"><span class="n">lf3</span></a> <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="p">[</span><span class="mf">0.07</span><span class="p">,</span> <span class="mf">0.09</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="n">add</span><span class="o">=</span><span class="mi">6</span><span class="p">)</span>
<span class="c1"># Apply the phasing effect with 20 notches.</span>
<span class="n">b</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/filters.html#pyo.Phaser" title="pyo.lib.filters.Phaser"><span class="n">Phaser</span></a><span class="p">(</span><a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.PinkNoise" title="pyo.lib.generators.PinkNoise"><span class="n">a</span></a><span class="p">,</span> <span class="n">freq</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">lf1</span></a><span class="p">,</span> <span class="n">spread</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">lf2</span></a><span class="p">,</span> <span class="n">q</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">lf3</span></a><span class="p">,</span> <span class="n">num</span><span class="o">=</span><span class="mi">20</span><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="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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