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
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
|
<!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>Applying digital signal processing at a higher sampling rate — 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="08-multiple-threads.html" rel="next" title="Launching the audio processing in a separated thread"/>
<link href="06-batch-synthesis.html" rel="prev" title="Offline batch generation of synthesis sounds"/>
</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="06-batch-synthesis.html" title="Offline batch generation of synthesis sounds">previous</a> |
<a accesskey="N" href="08-multiple-threads.html" title="Launching the audio processing in a separated thread">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"><a class="reference internal" href="../07-effects/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 current"><a class="reference internal" href="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="applying-digital-signal-processing-at-a-higher-sampling-rate">
<h1>Applying digital signal processing at a higher sampling rate<a class="headerlink" href="#applying-digital-signal-processing-at-a-higher-sampling-rate" title="Permalink to this heading">¶</a></h1>
<p><strong>07-upsamp-processing.py</strong></p>
<p>This script demonstrates how to use pyo to apply processing on a sound
at a very high sampling rate.</p>
<p>Pyo offers two functions to upsample and downsample an audio file:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">upsamp</span><span class="p">(</span><span class="n">path</span><span class="p">,</span> <span class="n">outfile</span><span class="p">,</span> <span class="n">up</span><span class="p">,</span> <span class="n">order</span><span class="p">)</span>
<span class="n">downsamp</span><span class="p">(</span><span class="n">path</span><span class="p">,</span> <span class="n">outfile</span><span class="p">,</span> <span class="n">down</span><span class="p">,</span> <span class="n">order</span><span class="p">)</span>
</pre></div>
</div>
<p>Where:</p>
<blockquote>
<div><ul class="simple">
<li><p><cite>path</cite> is the path to the file to process.</p></li>
<li><p><cite>outfile</cite> is the path where to save the resampled file.</p></li>
<li><p><cite>up</cite>, <cite>down</cite> is the resampling factor (new sampling rate will be
this value times the current sampling rate).</p></li>
<li><p><cite>order</cite> is the length, in samples, of the anti-aliasing lowpass filter.</p></li>
</ul>
</div></blockquote>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">os</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="c1"># Upsampling factor.</span>
<span class="n">SR_FACTOR</span> <span class="o">=</span> <span class="mi">8</span>
<span class="c1"># Size, in samples, of the anti-aliasing lowpass filters.</span>
<span class="n">SIZE</span> <span class="o">=</span> <span class="mi">512</span>
<span class="c1"># Sound to process.</span>
<span class="n">IN_SND</span> <span class="o">=</span> <span class="s2">"../snds/baseballmajeur_m.aif"</span>
<span class="c1"># Temporary audio files.</span>
<span class="n">UP_SND</span> <span class="o">=</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">expanduser</span><span class="p">(</span><span class="s2">"~"</span><span class="p">),</span> <span class="s2">"Desktop"</span><span class="p">,</span> <span class="s2">"temp_sound_up_</span><span class="si">%i</span><span class="s2">.aif"</span> <span class="o">%</span> <span class="n">SR_FACTOR</span><span class="p">)</span>
<span class="n">PROC_SND</span> <span class="o">=</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">expanduser</span><span class="p">(</span><span class="s2">"~"</span><span class="p">),</span> <span class="s2">"Desktop"</span><span class="p">,</span> <span class="s2">"temp_sound_disto.aif"</span><span class="p">)</span>
<span class="c1"># Output sound file.</span>
<span class="n">DOWN_SND</span> <span class="o">=</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">expanduser</span><span class="p">(</span><span class="s2">"~"</span><span class="p">),</span> <span class="s2">"Desktop"</span><span class="p">,</span> <span class="s2">"output_disto_down.aif"</span><span class="p">)</span>
<span class="c1"># Retrieve info about the source file.</span>
<span class="n">DUR</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/functions/sndfile.html#pyo.sndinfo" title="pyo.sndinfo"><span class="n">sndinfo</span></a><span class="p">(</span><span class="n">IN_SND</span><span class="p">)[</span><span class="mi">1</span><span class="p">]</span>
<span class="n">SR</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/functions/sndfile.html#pyo.sndinfo" title="pyo.sndinfo"><span class="n">sndinfo</span></a><span class="p">(</span><span class="n">IN_SND</span><span class="p">)[</span><span class="mi">2</span><span class="p">]</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">"Up sampling the source file </span><span class="si">%i</span><span class="s2"> times..."</span> <span class="o">%</span> <span class="n">SR_FACTOR</span><span class="p">)</span>
<a class="sphinx-codeautolink-a" href="../../api/functions/sampling.html#pyo.upsamp" title="pyo.upsamp"><span class="n">upsamp</span></a><span class="p">(</span><span class="n">IN_SND</span><span class="p">,</span> <span class="n">UP_SND</span><span class="p">,</span> <span class="n">SR_FACTOR</span><span class="p">,</span> <span class="n">SIZE</span><span class="p">)</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">"Apply distortion at a sampling rate of </span><span class="si">%i</span><span class="s2"> Hz."</span> <span class="o">%</span> <span class="p">(</span><span class="n">SR</span> <span class="o">*</span> <span class="n">SR_FACTOR</span><span class="p">))</span>
<span class="c1"># Initialize the Server in offline mode, at the desired sampling rate.</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">sr</span><span class="o">=</span><span class="n">SR</span> <span class="o">*</span> <span class="n">SR_FACTOR</span><span class="p">,</span> <span class="n">nchnls</span><span class="o">=</span><span class="mi">1</span><span class="p">,</span> <span class="n">duplex</span><span class="o">=</span><span class="mi">0</span><span class="p">,</span> <span class="n">audio</span><span class="o">=</span><span class="s2">"offline"</span><span class="p">)</span><span class="o">.</span><span class="n">boot</span><span class="p">()</span>
<span class="c1"># Set the recording parameters.</span>
<span class="n">s</span><span class="o">.</span><span class="n">recordOptions</span><span class="p">(</span><span class="n">dur</span><span class="o">=</span><span class="n">DUR</span> <span class="o">+</span> <span class="mf">0.1</span><span class="p">,</span> <span class="n">filename</span><span class="o">=</span><span class="n">PROC_SND</span><span class="p">,</span> <span class="n">fileformat</span><span class="o">=</span><span class="mi">0</span><span class="p">,</span> <span class="n">sampletype</span><span class="o">=</span><span class="mi">0</span><span class="p">)</span>
<span class="c1"># Read the upsampled version of the source file.</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="n">UP_SND</span><span class="p">,</span> <span class="n">loop</span><span class="o">=</span><span class="kc">False</span><span class="p">,</span> <span class="n">interp</span><span class="o">=</span><span class="mi">4</span><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"># Apply distortion on it.</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/effects.html#pyo.Disto" title="pyo.lib.effects.Disto"><span class="n">dist</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/effects.html#pyo.Disto" title="pyo.lib.effects.Disto"><span class="n">Disto</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> <span class="n">drive</span><span class="o">=</span><span class="mf">0.75</span><span class="p">,</span> <span class="n">slope</span><span class="o">=</span><span class="mf">0.7</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"># Lowpass filtering.</span>
<span class="n">filt</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/filters.html#pyo.Biquad" title="pyo.lib.filters.Biquad"><span class="n">Biquad</span></a><span class="p">(</span><a class="sphinx-codeautolink-a" href="../../api/classes/effects.html#pyo.Disto" title="pyo.lib.effects.Disto"><span class="n">dist</span></a><span class="p">,</span> <span class="n">freq</span><span class="o">=</span><span class="mi">8000</span><span class="p">,</span> <span class="n">q</span><span class="o">=</span><span class="mf">0.7</span><span class="p">,</span> <span class="nb">type</span><span class="o">=</span><span class="mi">0</span><span class="p">)</span><span class="o">.</span><span class="n">out</span><span class="p">()</span>
<span class="c1"># Start the offline processing.</span>
<span class="n">s</span><span class="o">.</span><span class="n">start</span><span class="p">()</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">"Down sampling the processed sound </span><span class="si">%i</span><span class="s2"> times..."</span> <span class="o">%</span> <span class="n">SR_FACTOR</span><span class="p">)</span>
<a class="sphinx-codeautolink-a" href="../../api/functions/sampling.html#pyo.downsamp" title="pyo.downsamp"><span class="n">downsamp</span></a><span class="p">(</span><span class="n">PROC_SND</span><span class="p">,</span> <span class="n">DOWN_SND</span><span class="p">,</span> <span class="n">SR_FACTOR</span><span class="p">,</span> <span class="n">SIZE</span><span class="p">)</span>
<span class="c1"># Cleanup the temporary files.</span>
<span class="n">os</span><span class="o">.</span><span class="n">remove</span><span class="p">(</span><span class="n">UP_SND</span><span class="p">)</span>
<span class="n">os</span><span class="o">.</span><span class="n">remove</span><span class="p">(</span><span class="n">PROC_SND</span><span class="p">)</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">"Done"</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="06-batch-synthesis.html" title="Offline batch generation of synthesis sounds">previous</a> |
<a href="08-multiple-threads.html" title="Launching the audio processing in a separated thread">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>
|
