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<div class="refentry" title="pvsynth">
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<h2>
<span class="refentrytitle">pvsynth</span>
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<p>pvsynth —
Resynthesise using a FFT overlap-add.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp39374144"></a>
<h2>Description</h2>
<p>
Resynthesise phase vocoder data (f-signal) using a FFT overlap-add.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp39374824"></a>
<h2>Syntax</h2>
<pre class="synopsis">ares <span class="command"><strong>pvsynth</strong></span> fsrc, [iinit]</pre>
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<div class="refsect1" title="Performance">
<a id="idp39385248"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>ares</em></span> -- output audio signal
</p>
<p>
<span class="emphasis"><em>fsrc</em></span> -- input signal
</p>
<p>
<span class="emphasis"><em>iinit</em></span> -- not yet implemented.
</p>
</div>
<div class="refsect1" title="Examples">
<a id="idp39386928"></a>
<h2>Examples</h2>
<p>
</p>
<div class="example">
<a id="idp39387392"></a>
<p class="title">
<strong>Example 679. Example (using score-supplied f-table, assuming fsig <span class="emphasis"><em>fftsize = 1024</em></span>)</strong>
</p>
<div class="example-contents">
<pre class="programlisting">
<span class="comment">; score f-table using cubic spline to define shaped peaks</span>
<span class="stamnt">f</span>1 0 513 8 0 2 1 3 0 4 1 6 0 10 1 12 0 16 1 32 0 1 0 436 0
asig <span class="opc">buzz</span> 20000, 199, 50, 1 <span class="comment">; pulsewave source</span>
fsig <span class="opc">pvsanal</span> asig, 1024, 256, 1024, 0 <span class="comment">; create fsig</span>
kmod <span class="opc">linseg</span> 0, p3/2, 1, p3/2, 0 <span class="comment">; simple control sig</span>
fsigout <span class="opc">pvsmaska</span> fsig, 2, kmod <span class="comment">; apply weird eq to fsig</span>
aout <span class="opc">pvsynth</span> fsigout <span class="comment">; resynthesize,</span>
<span class="opc">dispfft</span> aout, 0.1, 1024 <span class="comment">; and view the effect</span></pre>
</div>
</div>
<p><br class="example-break" />
</p>
<p>
Here is an example of the pvsynth opcode. It uses the file <a class="ulink" href="examples/pvsynth.csd" target="_top"><em class="citetitle">pvsynth.csd</em></a>.
</p>
<div class="example">
<a id="idp39424432"></a>
<p class="title">
<strong>Example 680. Example of the pvsynth opcode.</strong>
</p>
<div class="example-contents">
<p>See the sections <a class="link" href="UsingRealTime.html" title="Real-Time Audio"><em class="citetitle">Real-time Audio</em></a> and <a class="link" href="CommandFlags.html" title="Csound command line"><em class="citetitle">Command Line Flags</em></a> for more information on using command line flags.</p>
<pre class="programlisting">
<span class="csdtag"><CsoundSynthesizer></span>
<span class="csdtag"><CsOptions></span>
<span class="comment">; Select audio/midi flags here according to platform</span>
<span class="comment">; Audio out Audio in</span>
-odac <span class="comment">;;;RT audio I/O</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o pvsynth.wav -W ;;; for file output any platform</span>
<span class="csdtag"></CsOptions></span>
<span class="csdtag"><CsInstruments></span>
<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">ksmps</span> <span class="op">=</span> 16
<span class="ohdr">nchnls</span> <span class="op">=</span> 1
<span class="ohdr">0dbfs</span> <span class="op">=</span> 1
<span class="comment">;; example written by joachim heintz 2009</span>
<span class="oblock">instr</span> 1
ifftsize <span class="op">=</span> 1024
ioverlap <span class="op">=</span> ifftsize <span class="op">/</span> 4
iwinsize <span class="op">=</span> ifftsize
iwinshape <span class="op">=</span> 1 <span class="comment">; von-Hann window</span>
Sfile <span class="op">=</span> "fox.wav"
ain <span class="opc">soundin</span> Sfile
fftin <span class="opc">pvsanal</span> ain, ifftsize, ioverlap, iwinsize, iwinshape<span class="comment">; fft-analysis of the audio-signal</span>
aout <span class="opc">pvsynth</span> fftin<span class="comment">; resynthesis</span>
<span class="opc">out</span> aout
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">i</span> 1 0 3
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
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</div>
<p><br class="example-break" />
</p>
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<div class="refsect1" title="See Also">
<a id="idp39426712"></a>
<h2>See Also</h2>
<p>
<a class="link" href="pvsanal.html" title="pvsanal"><em class="citetitle">pvsanal</em></a>,
<a class="link" href="pvsadsyn.html" title="pvsadsyn"><em class="citetitle">pvsadsyn</em></a>
</p>
</div>
<div class="refsect1" title="Credits">
<a id="idp39428208"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Richard Dobson</td>
</tr>
<tr>
<td>August 2001 </td>
</tr>
</table>
<p>
</p>
<p>New in version 4.13</p>
<p>February 2004. Thanks to a note from Francisco Vila, updated the example.</p>
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