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<section id="schroeder-reverb-py-simple-reverberator-based-on-schroeder-s-algorithms">
<h1>02-schroeder-reverb.py - Simple reverberator based on Schroeder’s algorithms.<a class="headerlink" href="#schroeder-reverb-py-simple-reverberator-based-on-schroeder-s-algorithms" title="Permalink to this heading">¶</a></h1>
<p>An artificial reverberation based on the work of Manfred Schroeder.</p>
<p>This reverberator takes a monophonic input and outputs two uncorrelated
reverberated signals.</p>
<p>This algorithm presents four parallel comb filters fedding two serial
allpass filters. An additional lowpass filter is used at the end to
control the brightness of the reverberator.</p>
<p>The manual example for the Allpass object presents an other Schroeder’s
reverberator.</p>
<p>If you are interested in builtin reverberation objects, see:</p>
<blockquote>
<div><p>Freeverb, WGVerb, STRev, CvlVerb</p>
</div></blockquote>
<p>Not really reverbs, but you can build some cool resonant effects with:</p>
<blockquote>
<div><p>Waveguide, AllpassWG</p>
</div></blockquote>
<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>
<a class="sphinx-codeautolink-a" href="../../api/classes/tables.html#pyo.SndTable" title="pyo.lib.tables.SndTable"><span class="n">soundfile</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/tables.html#pyo.SndTable" title="pyo.lib.tables.SndTable"><span class="n">SndTable</span></a><span class="p">(</span><span class="n">SNDS_PATH</span> <span class="o">+</span> <span class="s2">"/transparent.aif"</span><span class="p">)</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/tableprocess.html#pyo.Looper" title="pyo.lib.tableprocess.Looper"><span class="n">src</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/tableprocess.html#pyo.Looper" title="pyo.lib.tableprocess.Looper"><span class="n">Looper</span></a><span class="p">(</span><a class="sphinx-codeautolink-a" href="../../api/classes/tables.html#pyo.SndTable" title="pyo.lib.tables.SndTable"><span class="n">soundfile</span></a><span class="p">,</span> <span class="n">dur</span><span class="o">=</span><span class="mi">2</span><span class="p">,</span> <span class="n">xfade</span><span class="o">=</span><span class="mi">0</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="n">src2</span> <span class="o">=</span> <span class="n">src</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"># Four parallel stereo comb filters. The delay times are chosen</span>
<span class="c1"># to be as uncorrelated as possible. Prime numbers are a good</span>
<span class="c1"># choice for delay lengths in samples.</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/effects.html#pyo.Delay" title="pyo.lib.effects.Delay"><span class="n">comb1</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/tableprocess.html#pyo.Looper" title="pyo.lib.tableprocess.Looper"><span class="n">src</span></a><span class="p">,</span> <span class="n">delay</span><span class="o">=</span><span class="p">[</span><span class="mf">0.0297</span><span class="p">,</span> <span class="mf">0.0277</span><span class="p">],</span> <span class="n">feedback</span><span class="o">=</span><span class="mf">0.65</span><span class="p">)</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/effects.html#pyo.Delay" title="pyo.lib.effects.Delay"><span class="n">comb2</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/tableprocess.html#pyo.Looper" title="pyo.lib.tableprocess.Looper"><span class="n">src</span></a><span class="p">,</span> <span class="n">delay</span><span class="o">=</span><span class="p">[</span><span class="mf">0.0371</span><span class="p">,</span> <span class="mf">0.0393</span><span class="p">],</span> <span class="n">feedback</span><span class="o">=</span><span class="mf">0.51</span><span class="p">)</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/effects.html#pyo.Delay" title="pyo.lib.effects.Delay"><span class="n">comb3</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/tableprocess.html#pyo.Looper" title="pyo.lib.tableprocess.Looper"><span class="n">src</span></a><span class="p">,</span> <span class="n">delay</span><span class="o">=</span><span class="p">[</span><span class="mf">0.0411</span><span class="p">,</span> <span class="mf">0.0409</span><span class="p">],</span> <span class="n">feedback</span><span class="o">=</span><span class="mf">0.5</span><span class="p">)</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/effects.html#pyo.Delay" title="pyo.lib.effects.Delay"><span class="n">comb4</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/tableprocess.html#pyo.Looper" title="pyo.lib.tableprocess.Looper"><span class="n">src</span></a><span class="p">,</span> <span class="n">delay</span><span class="o">=</span><span class="p">[</span><span class="mf">0.0137</span><span class="p">,</span> <span class="mf">0.0155</span><span class="p">],</span> <span class="n">feedback</span><span class="o">=</span><span class="mf">0.73</span><span class="p">)</span>
<span class="n">combsum</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/tableprocess.html#pyo.Looper" title="pyo.lib.tableprocess.Looper"><span class="n">src</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">comb1</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">comb2</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">comb3</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">comb4</span></a>
<span class="c1"># The sum of the original signal and the comb filters</span>
<span class="c1"># feeds two serial allpass filters.</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/filters.html#pyo.Allpass" title="pyo.lib.filters.Allpass"><span class="n">all1</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/filters.html#pyo.Allpass" title="pyo.lib.filters.Allpass"><span class="n">Allpass</span></a><span class="p">(</span><span class="n">combsum</span><span class="p">,</span> <span class="n">delay</span><span class="o">=</span><span class="p">[</span><span class="mf">0.005</span><span class="p">,</span> <span class="mf">0.00507</span><span class="p">],</span> <span class="n">feedback</span><span class="o">=</span><span class="mf">0.75</span><span class="p">)</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/filters.html#pyo.Allpass" title="pyo.lib.filters.Allpass"><span class="n">all2</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/filters.html#pyo.Allpass" title="pyo.lib.filters.Allpass"><span class="n">Allpass</span></a><span class="p">(</span><a class="sphinx-codeautolink-a" href="../../api/classes/filters.html#pyo.Allpass" title="pyo.lib.filters.Allpass"><span class="n">all1</span></a><span class="p">,</span> <span class="n">delay</span><span class="o">=</span><span class="p">[</span><span class="mf">0.0117</span><span class="p">,</span> <span class="mf">0.0123</span><span class="p">],</span> <span class="n">feedback</span><span class="o">=</span><span class="mf">0.61</span><span class="p">)</span>
<span class="c1"># Brightness control.</span>
<span class="n">lowp</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/filters.html#pyo.Tone" title="pyo.lib.filters.Tone"><span class="n">Tone</span></a><span class="p">(</span><a class="sphinx-codeautolink-a" href="../../api/classes/filters.html#pyo.Allpass" title="pyo.lib.filters.Allpass"><span class="n">all2</span></a><span class="p">,</span> <span class="n">freq</span><span class="o">=</span><span class="mi">3500</span><span class="p">,</span> <span class="n">mul</span><span class="o">=</span><span class="mf">0.25</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>
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