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<section id="hand-made-harmonizer-py-hand-written-harmonizer-effect">
<h1>07-hand-made-harmonizer.py - Hand-written harmonizer effect.<a class="headerlink" href="#hand-made-harmonizer-py-hand-written-harmonizer-effect" title="Permalink to this heading">¶</a></h1>
<p>A harmonizer is a type of pitch shifter that combines the “shifted” pitch
with the original pitch to create a two or more note harmony.</p>
<p>The implementation consists of two overlapping delay lines for which the
reading head speed is tuned to transpose the signal by an amount specified
in semitones.</p>
<p>The Harmonizer object (from pyo) implements an pitch shifter and should
use less CPU than the hand-written version. this example’s purpose is only
to show how it works or to be used as a starting point to build an extended
version.</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="n">duplex</span><span class="o">=</span><span class="mi">0</span><span class="p">)</span><span class="o">.</span><span class="n">boot</span><span class="p">()</span>
<span class="c1"># Play a melodic sound and send its signal to the left speaker.</span>
<span class="n">sf</span> <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/flute.aif"</span><span class="p">,</span> <span class="n">speed</span><span class="o">=</span><span class="mi">1</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="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="c1"># Half-sine window used as the amplitude envelope of the overlaps.</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">8</span><span class="p">)</span>
<span class="c1"># Length of the window in seconds.</span>
<span class="n">wsize</span> <span class="o">=</span> <span class="mf">0.1</span>
<span class="c1"># Amount of transposition in semitones.</span>
<span class="n">trans</span> <span class="o">=</span> <span class="o">-</span><span class="mi">7</span>
<span class="c1"># Compute the transposition ratio.</span>
<span class="n">ratio</span> <span class="o">=</span> <span class="nb">pow</span><span class="p">(</span><span class="mf">2.0</span><span class="p">,</span> <span class="n">trans</span> <span class="o">/</span> <span class="mf">12.0</span><span class="p">)</span>
<span class="c1"># Compute the reading head speed.</span>
<span class="n">rate</span> <span class="o">=</span> <span class="o">-</span><span class="p">(</span><span class="n">ratio</span> <span class="o">-</span> <span class="mi">1</span><span class="p">)</span> <span class="o">/</span> <span class="n">wsize</span>
<span class="c1"># Two reading heads out-of-phase.</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.Phasor" title="pyo.lib.generators.Phasor"><span class="n">ind</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.Phasor" title="pyo.lib.generators.Phasor"><span class="n">Phasor</span></a><span class="p">(</span><span class="n">freq</span><span class="o">=</span><span class="n">rate</span><span class="p">,</span> <span class="n">phase</span><span class="o">=</span><span class="p">[</span><span class="mi">0</span><span class="p">,</span> <span class="mf">0.5</span><span class="p">])</span>
<span class="c1"># Each head reads the amplitude envelope...</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/tableprocess.html#pyo.Pointer" title="pyo.lib.tableprocess.Pointer"><span class="n">win</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/tableprocess.html#pyo.Pointer" title="pyo.lib.tableprocess.Pointer"><span class="n">Pointer</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.WinTable" title="pyo.lib.tables.WinTable"><span class="n">env</span></a><span class="p">,</span> <span class="n">index</span><span class="o">=</span><a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.Phasor" title="pyo.lib.generators.Phasor"><span class="n">ind</span></a><span class="p">,</span> <span class="n">mul</span><span class="o">=</span><span class="mf">0.7</span><span class="p">)</span>
<span class="c1"># ... and modulates the delay time (scaled by the window size) of a delay line.</span>
<span class="c1"># mix(1) is used to mix the two overlaps on a single audio stream.</span>
<span class="n">snd</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">Delay</span></a><span class="p">(</span><span class="n">sf</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.Phasor" title="pyo.lib.generators.Phasor"><span class="n">ind</span></a> <span class="o">*</span> <span class="n">wsize</span><span class="p">,</span> <span class="n">mul</span><span class="o">=</span><a class="sphinx-codeautolink-a" href="../../api/classes/tableprocess.html#pyo.Pointer" title="pyo.lib.tableprocess.Pointer"><span class="n">win</span></a><span class="p">)</span><span class="o">.</span><span class="n">mix</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span>
<span class="c1"># The transposed signal is sent to the right speaker.</span>
<span class="n">snd</span><span class="o">.</span><span class="n">out</span><span class="p">(</span><span class="mi">1</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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