1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
|
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8"/>
<meta content="width=device-width, initial-scale=1.0" name="viewport"/><meta content="Docutils 0.17.1: http://docutils.sourceforge.net/" name="generator"/>
<title>06-hand-made-chorus.py - Hand-written 8 delay lines stereo chorus. — Pyo 1.0.5 documentation</title>
<link href="../../_static/pygments.css" rel="stylesheet" type="text/css"/>
<link href="../../_static/agogo.css" rel="stylesheet" type="text/css"/>
<link href="../../_static/sphinx-codeautolink.css" rel="stylesheet" type="text/css"/>
<link href="../../_static/autoclasstoc.css" rel="stylesheet" type="text/css"/>
<script data-url_root="../../" id="documentation_options" src="../../_static/documentation_options.js"></script>
<script src="../../_static/jquery.js"></script>
<script src="../../_static/underscore.js"></script>
<script src="../../_static/_sphinx_javascript_frameworks_compat.js"></script>
<script src="../../_static/doctools.js"></script>
<script src="../../_static/sphinx_highlight.js"></script>
<link href="../../_static/E-PyoIcon.ico" rel="shortcut icon"/>
<link href="../../about.html" rel="author" title="About these documents"/>
<link href="../../genindex.html" rel="index" title="Index"/>
<link href="../../search.html" rel="search" title="Search"/>
<link href="06-hand-made-harmonizer.html" rel="next" title="07-hand-made-harmonizer.py - Hand-written harmonizer effect."/>
<link href="04-ping-pong-delay.html" rel="prev" title="04-ping-pong-delay.py - Stereo ping-pong delay."/>
</head><body>
<div class="header-wrapper" role="banner">
<div class="header">
<div class="headertitle"><a href="../../index.html">Pyo 1.0.5 documentation</a></div>
<div aria-label="related navigation" class="rel" role="navigation">
<a accesskey="P" href="04-ping-pong-delay.html" title="04-ping-pong-delay.py - Stereo ping-pong delay.">previous</a> |
<a accesskey="N" href="06-hand-made-harmonizer.html" title="07-hand-made-harmonizer.py - Hand-written harmonizer effect.">next</a> |
<a accesskey="I" href="../../genindex.html" title="General Index">index</a>
</div>
</div>
</div>
<div class="content-wrapper">
<div class="content">
<div class="sidebar">
<h3>Table of Contents</h3>
<ul>
<li class="toctree-l1"><a class="reference internal" href="../../about.html">About pyo</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../download.html">Installing pyo with pip</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../compiling.html">Compiling pyo from sources</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../structure.html">Structure of the library</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../gettingstarted.html">Getting started</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../winaudioinspect.html">Configuring the audio output (Windows)</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../perftips.html">Improve performance of pyo programs</a></li>
</ul>
<ul class="current">
<li class="toctree-l1"><a class="reference internal" href="../../api/index.html">API documentation</a></li>
<li class="toctree-l1 current"><a class="reference internal" href="../index.html">Examples</a><ul class="current">
<li class="toctree-l2"><a class="reference internal" href="../01-intro/index.html">First steps</a></li>
<li class="toctree-l2"><a class="reference internal" href="../02-controls/index.html">Parameter control</a></li>
<li class="toctree-l2"><a class="reference internal" href="../03-generators/index.html">Synthesis generators</a></li>
<li class="toctree-l2"><a class="reference internal" href="../04-soundfiles/index.html">Playing with soundfiles</a></li>
<li class="toctree-l2"><a class="reference internal" href="../05-envelopes/index.html">Amplitude envelopes</a></li>
<li class="toctree-l2"><a class="reference internal" href="../06-filters/index.html">Filtering</a></li>
<li class="toctree-l2 current"><a class="reference internal" href="index.html">Creating sound effects</a></li>
<li class="toctree-l2"><a class="reference internal" href="../08-dynamics/index.html">Dynamic range of audio signals</a></li>
<li class="toctree-l2"><a class="reference internal" href="../09-callbacks/index.html">Calling python functions from audio objects</a></li>
<li class="toctree-l2"><a class="reference internal" href="../10-tables/index.html">Using tables</a></li>
<li class="toctree-l2"><a class="reference internal" href="../16-midi/index.html">How to use MIDI with pyo</a></li>
<li class="toctree-l2"><a class="reference internal" href="../17-osc/index.html">How to use OSC with pyo</a></li>
<li class="toctree-l2"><a class="reference internal" href="../19-multirate/index.html">Multirate audio processing</a></li>
<li class="toctree-l2"><a class="reference internal" href="../20-multicore/index.html">Multicore audio programming</a></li>
<li class="toctree-l2"><a class="reference internal" href="../21-utilities/index.html">Utilities</a></li>
<li class="toctree-l2"><a class="reference internal" href="../22-events/index.html">Events framework</a></li>
<li class="toctree-l2"><a class="reference internal" href="../23-expression/index.html">Evaluating prefix expression</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="../../tutorials/index.html">Advanced tutorials</a></li>
</ul>
<div role="search">
<h3 style="margin-top: 1.5em;">Search</h3>
<form action="../../search.html" class="search" method="get">
<input name="q" type="text"/>
<input type="submit" value="Go"/>
</form>
</div>
</div>
<div class="document">
<div class="documentwrapper">
<div class="bodywrapper">
<div class="body" role="main">
<section id="hand-made-chorus-py-hand-written-8-delay-lines-stereo-chorus">
<h1>06-hand-made-chorus.py - Hand-written 8 delay lines stereo chorus.<a class="headerlink" href="#hand-made-chorus-py-hand-written-8-delay-lines-stereo-chorus" title="Permalink to this heading">¶</a></h1>
<p>A chorus (or ensemble) is a modulation effect used to create a richer,
thicker sound and add subtle movement. The effect roughly simulates
the slight variations in pitch and timing that occur when multiple
performers sing or play the same part.</p>
<p>A single voice chorus uses a single delay that creates a single modulated
duplicate of the incoming audio. Basic chorus effects and inexpensive guitar
pedals are often single-voice.</p>
<p>A multiple voice chorus uses multiple modulated delays to create a richer
sound with more movement than a single voice chorus.</p>
<p>The Chorus object (from pyo) implements an 8 delay lines chorus 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"># Start a source sound.</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/players.html#pyo.SfPlayer" title="pyo.lib.players.SfPlayer"><span class="n">sf</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="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">0.3</span><span class="p">)</span>
<span class="c1"># Mix the source in stereo and send the signal to the output.</span>
<span class="n">sf2</span> <span class="o">=</span> <span class="n">sf</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="o">.</span><span class="n">out</span><span class="p">()</span>
<span class="c1"># Sets values for 8 LFO'ed delay lines (you can add more if you want!).</span>
<span class="c1"># LFO frequencies.</span>
<span class="n">freqs</span> <span class="o">=</span> <span class="p">[</span><span class="mf">0.254</span><span class="p">,</span> <span class="mf">0.465</span><span class="p">,</span> <span class="mf">0.657</span><span class="p">,</span> <span class="mf">0.879</span><span class="p">,</span> <span class="mf">1.23</span><span class="p">,</span> <span class="mf">1.342</span><span class="p">,</span> <span class="mf">1.654</span><span class="p">,</span> <span class="mf">1.879</span><span class="p">]</span>
<span class="c1"># Center delays in seconds.</span>
<span class="n">cdelay</span> <span class="o">=</span> <span class="p">[</span><span class="mf">0.0087</span><span class="p">,</span> <span class="mf">0.0102</span><span class="p">,</span> <span class="mf">0.0111</span><span class="p">,</span> <span class="mf">0.01254</span><span class="p">,</span> <span class="mf">0.0134</span><span class="p">,</span> <span class="mf">0.01501</span><span class="p">,</span> <span class="mf">0.01707</span><span class="p">,</span> <span class="mf">0.0178</span><span class="p">]</span>
<span class="c1"># Modulation depths in seconds.</span>
<span class="n">adelay</span> <span class="o">=</span> <span class="p">[</span><span class="mf">0.001</span><span class="p">,</span> <span class="mf">0.0012</span><span class="p">,</span> <span class="mf">0.0013</span><span class="p">,</span> <span class="mf">0.0014</span><span class="p">,</span> <span class="mf">0.0015</span><span class="p">,</span> <span class="mf">0.0016</span><span class="p">,</span> <span class="mf">0.002</span><span class="p">,</span> <span class="mf">0.0023</span><span class="p">]</span>
<span class="c1"># Create 8 sinusoidal LFOs with center delays "cdelay" and depths "adelay".</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.Sine" title="pyo.lib.generators.Sine"><span class="n">lfos</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">freqs</span><span class="p">,</span> <span class="n">mul</span><span class="o">=</span><span class="n">adelay</span><span class="p">,</span> <span class="n">add</span><span class="o">=</span><span class="n">cdelay</span><span class="p">)</span>
<span class="c1"># Create 8 modulated delay lines with a little feedback and send the signals</span>
<span class="c1"># to the output. Streams 1, 3, 5, 7 to the left and streams 2, 4, 6, 8 to the</span>
<span class="c1"># right (default behaviour of the out() method).</span>
<span class="n">delays</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><a class="sphinx-codeautolink-a" href="../../api/classes/players.html#pyo.SfPlayer" title="pyo.lib.players.SfPlayer"><span class="n">sf</span></a><span class="p">,</span> <a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.Sine" title="pyo.lib.generators.Sine"><span class="n">lfos</span></a><span class="p">,</span> <span class="n">feedback</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">0.5</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>
</div>
</section>
<div class="clearer"></div>
</div>
</div>
</div>
</div>
<div class="clearer"></div>
</div>
</div>
<div class="footer-wrapper">
<div class="footer">
<div class="left">
<div aria-label="related navigaton" role="navigation">
<a href="04-ping-pong-delay.html" title="04-ping-pong-delay.py - Stereo ping-pong delay.">previous</a> |
<a href="06-hand-made-harmonizer.html" title="07-hand-made-harmonizer.py - Hand-written harmonizer effect.">next</a> |
<a href="../../genindex.html" title="General Index">index</a>
</div>
<div aria-label="source link" role="note">
</div>
</div>
<div class="right">
<div class="footer" role="contentinfo">
© Copyright 2021, Olivier Bélanger.
Created using <a href="https://www.sphinx-doc.org/">Sphinx</a> 5.3.0.
</div>
</div>
<div class="clearer"></div>
</div>
</div>
</body>
</html>
|
