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<a id="paulstretch"></a>
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<a id="IndexPaulStretch" class="indexterm"></a>
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<h2>
<span class="refentrytitle">paulstretch</span>
</h2>
<p>paulstretch —
Extreme time-stretching algorithm by Nasca Octavian Paul.
</p>
</div>
<div class="refsect1">
<a id="idm281472905215272"></a>
<h2>Description</h2>
<p>
The <span class="emphasis"><em>paulstretch</em></span> opcode is a lightweight
implementation of the PaulStretch time-stretching algorithm by
Nasca Octavian Paul. It is ideal for timestretching a signal by
very large amounts.
</p>
<p>
The Paulstretch algorithm works very similarly to other
STFT-based timestretching methods, using overlap-add with a
hanning window. Unique to paulstretch are the use of scrambled
phase and very large window sizes (specified in seconds).
</p>
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<div class="refsect1">
<a id="idm281472905150776"></a>
<h2>Syntax</h2>
<pre class="synopsis">asig <span class="command"><strong>paulstretch</strong></span> istretch, iwindowsize, ift
</pre>
</div>
<div class="refsect1">
<a id="idm281472905148520"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>istretch</em></span> -- Stretch factor.
</p>
<p>
<span class="emphasis"><em>iwindowsize</em></span> -- Window size, in seconds.
</p>
<p>
<span class="emphasis"><em>ift</em></span> -- source signal function
table. Deferred-allocation tables (see
<a class="link" href="GEN01.html" title="GEN01"><em class="citetitle">GEN01</em></a>) are
accepted, but the opcode expects a mono source.
</p>
</div>
<div class="refsect1">
<a id="idm281472905143928"></a>
<h2>Examples</h2>
<p>
Here is an example of the paulstretch opcode. It uses the file
<a class="ulink" href="examples/paulstretch.csd" target="_top"><em class="citetitle">paulstretch.csd</em></a>
</p>
<div class="example">
<a id="idm281472905141992"></a>
<p class="title">
<strong>Example 670. Example of the paulstretch opcode.</strong>
</p>
<div class="example-contents">
<div class="refsect1">
<a id="idm281472727359000"></a>
<pre class="programlisting">
<span class="nt"><CsoundSynthesizer></span>
<span class="nt"><CsOptions></span>
-o paulstretch.wav -W
<span class="nt"></CsOptions></span>
<span class="nt"><CsInstruments></span>
<span class="vg">sr</span> <span class="o">=</span> <span class="mi">44100</span>
<span class="vg">ksmps</span> <span class="o">=</span> <span class="mi">100</span>
<span class="vg">0dbfs</span> <span class="o">=</span> <span class="mi">1</span>
<span class="vg">nchnls</span> <span class="o">=</span> <span class="mi">2</span>
gi<span class="n">wav</span> <span class="nb">ftgen</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="s">"fox.wav"</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">1</span>
<span class="kd">instr</span> <span class="nf">1</span>
a<span class="n">out</span> <span class="nb">paulstretch</span> <span class="mi">10</span><span class="p">,</span> <span class="mf">0.2</span><span class="p">,</span> gi<span class="n">wav</span>
<span class="nb">outs</span> a<span class="n">out</span><span class="p">,</span> a<span class="n">out</span>
<span class="kd">endin</span>
<span class="nt"></CsInstruments></span>
<span class="nt"><CsScore></span>
<span class="nb">i</span><span class="mi">1</span> <span class="mi">0</span> <span class="mi">30</span>
<span class="nt"></CsScore></span>
<span class="nt"></CsoundSynthesizer></span>
</pre>
</div>
</div>
</div>
<p><br class="example-break" />
</p>
</div>
<div class="refsect1">
<a id="idm281472905140168"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Paul Batchelor</td>
</tr>
<tr>
<td>May 2016</td>
</tr>
</table>
<p>
</p>
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