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<section id="flanger-py-hand-made-simple-flanger">
<h1>01-flanger.py - Hand-made simple flanger.<a class="headerlink" href="#flanger-py-hand-made-simple-flanger" title="Permalink to this heading">¶</a></h1>
<p>A flanger is an audio effect produced by mixing two identical signals
together, one signal delayed by a small and gradually changing period.
This produces a swept comb filter effect: peaks and notches are produced
in the resulting frequency spectrum, related to each other in a linear
harmonic series. Varying the time delay causes these to sweep up and
down the frequency 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"># Rich frequency spectrum as stereo input source.</span>
<span class="n">amp</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">0.25</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">play</span><span class="p">()</span>
<span class="n">src</span> <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">amp</span><span class="p">)</span><span class="o">.</span><span class="n">mix</span><span class="p">(</span><span class="mi">2</span><span class="p">)</span>
<span class="c1"># Flanger parameters == unit ==</span>
<span class="n">middelay</span> <span class="o">=</span> <span class="mf">0.005</span> <span class="c1"># seconds</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/controls.html#pyo.Sig" title="pyo.lib._core.Sig"><span class="n">depth</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/controls.html#pyo.Sig" title="pyo.lib._core.Sig"><span class="n">Sig</span></a><span class="p">(</span><span class="mf">0.99</span><span class="p">)</span> <span class="c1"># 0 --> 1</span>
<span class="n">depth</span><span class="o">.</span><span class="n">ctrl</span><span class="p">(</span><span class="n">title</span><span class="o">=</span><span class="s2">"Modulation Depth"</span><span class="p">)</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/controls.html#pyo.Sig" title="pyo.lib._core.Sig"><span class="n">lfospeed</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/controls.html#pyo.Sig" title="pyo.lib._core.Sig"><span class="n">Sig</span></a><span class="p">(</span><span class="mf">0.2</span><span class="p">)</span> <span class="c1"># Hertz</span>
<span class="n">lfospeed</span><span class="o">.</span><span class="n">ctrl</span><span class="p">(</span><span class="n">title</span><span class="o">=</span><span class="s2">"LFO Frequency in Hz"</span><span class="p">)</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/controls.html#pyo.Sig" title="pyo.lib._core.Sig"><span class="n">feedback</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/controls.html#pyo.Sig" title="pyo.lib._core.Sig"><span class="n">Sig</span></a><span class="p">(</span><span class="mf">0.5</span><span class="p">,</span> <span class="n">mul</span><span class="o">=</span><span class="mf">0.95</span><span class="p">)</span> <span class="c1"># 0 --> 1</span>
<span class="n">feedback</span><span class="o">.</span><span class="n">ctrl</span><span class="p">(</span><span class="n">title</span><span class="o">=</span><span class="s2">"Feedback"</span><span class="p">)</span>
<span class="c1"># LFO with adjusted output range to control the delay time in seconds.</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.Sine" title="pyo.lib.generators.Sine"><span class="n">lfo</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><a class="sphinx-codeautolink-a" href="../../api/classes/controls.html#pyo.Sig" title="pyo.lib._core.Sig"><span class="n">lfospeed</span></a><span class="p">,</span> <span class="n">mul</span><span class="o">=</span><span class="n">middelay</span> <span class="o">*</span> <a class="sphinx-codeautolink-a" href="../../api/classes/controls.html#pyo.Sig" title="pyo.lib._core.Sig"><span class="n">depth</span></a><span class="p">,</span> <span class="n">add</span><span class="o">=</span><span class="n">middelay</span><span class="p">)</span>
<span class="c1"># Dynamically delayed signal. The source passes through a DCBlock</span>
<span class="c1"># to ensure there is no DC offset in the signal (with feedback, DC</span>
<span class="c1"># offset can be fatal!).</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/effects.html#pyo.Delay" title="pyo.lib.effects.Delay"><span class="n">flg</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/effects.html#pyo.Delay" title="pyo.lib.effects.Delay"><span class="n">Delay</span></a><span class="p">(</span><a class="sphinx-codeautolink-a" href="../../api/classes/filters.html#pyo.DCBlock" title="pyo.lib.filters.DCBlock"><span class="n">DCBlock</span></a><span class="p">(</span><span class="n">src</span><span class="p">),</span> <span class="n">delay</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">lfo</span></a><span class="p">,</span> <span class="n">feedback</span><span class="o">=</span><a class="sphinx-codeautolink-a" href="../../api/classes/controls.html#pyo.Sig" title="pyo.lib._core.Sig"><span class="n">feedback</span></a><span class="p">)</span>
<span class="c1"># Mix the original source with its delayed version.</span>
<span class="c1"># Compress the mix to normalize the output signal.</span>
<span class="n">cmp</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><span class="n">src</span> <span class="o">+</span> <a class="sphinx-codeautolink-a" href="../../api/classes/effects.html#pyo.Delay" title="pyo.lib.effects.Delay"><span class="n">flg</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="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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