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<div class="refentry" title="pvsadsyn">
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<h2>
<span class="refentrytitle">pvsadsyn</span>
</h2>
<p>pvsadsyn —
Resynthesize using a fast oscillator-bank.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp38062152"></a>
<h2>Description</h2>
<p>
Resynthesize using a fast oscillator-bank.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp38048928"></a>
<h2>Syntax</h2>
<pre class="synopsis">ares <span class="command"><strong>pvsadsyn</strong></span> fsrc, inoscs, kfmod [, ibinoffset] [, ibinincr] [, iinit]</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp38050064"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>inoscs</em></span> -- The number of analysis bins to synthesise. Cannot be larger than the size of fsrc (see <a class="link" href="pvsinfo.html" title="pvsinfo"><em class="citetitle">pvsinfo</em></a>), e.g. as created by <a class="link" href="pvsanal.html" title="pvsanal"><em class="citetitle">pvsanal</em></a>. Processing time is directly proportional to inoscs.
</p>
<p>
<span class="emphasis"><em>ibinoffset</em></span> (optional, default=0) -- The first (lowest) bin to resynthesise, counting from 0 (default = 0).
</p>
<p>
<span class="emphasis"><em>ibinincr</em></span> (optional) -- Starting from bin ibinoffset, resynthesize bins ibinincr apart.
</p>
<p>
<span class="emphasis"><em>iinit</em></span> (optional) -- Skip reinitialization. This is not currently implemented for any of these opcodes, and it remains to be seen if it is even practical.
</p>
</div>
<div class="refsect1" title="Performance">
<a id="idp38100152"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>kfmod</em></span> -- Scale all frequencies by factor kfmod. 1.0 = no change, 2 = up one octave.
</p>
<p>
<span class="emphasis"><em>pvsadsyn</em></span> is experimental, and implements the oscillator bank using a fast direct calculation method, rather than a lookup table. This takes advantage of the fact, empirically arrived at, that for the analysis rates generally used, (and presuming analysis using <a class="link" href="pvsanal.html" title="pvsanal"><em class="citetitle">pvsanal</em></a>, where frequencies in a bin change only slightly between frames) it is not necessary to interpolate frequencies between frames, only amplitudes. Accurate resynthesis is often contingent on the use of pvsanal with iwinsize = ifftsize*2.
</p>
<p>
This opcode is the most likely to change, or be much extended, according to feedback and advice from users. It is likely that a full interpolating table-based method will be added, via a further optional iarg. The parameter list to pvsadsyn mimics that for <a class="link" href="pvadd.html" title="pvadd"><em class="citetitle">pvadd</em></a>, but excludes spectral extraction.
</p>
</div>
<div class="refsect1" title="Examples">
<a id="idp38103376"></a>
<h2>Examples</h2>
<p>
Here is an example of the pvsadsyn opcode. It uses the file <a class="ulink" href="examples/pvsadsyn.csd" target="_top"><em class="citetitle">pvsadsyn.csd</em></a>.
</p>
<div class="example">
<a id="idp38104360"></a>
<p class="title">
<strong>Example 634. Example of the pvsadsyn 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 pvsadsyn.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">opcode</span> FileToPvsBuf, iik, Siiii
<span class="comment">;;writes an audio file at the first k-cycle to a fft-buffer (via pvsbuffer)</span>
Sfile, ifftsize, ioverlap, iwinsize, iwinshape <span class="opc">xin</span>
ktimek <span class="opc">timeinstk</span>
<span class="octrl">if</span> ktimek <span class="op">==</span> 1 then
ilen <span class="opc">filelen</span> Sfile
kcycles <span class="op">=</span> ilen <span class="op">*</span> <span class="ohdr">kr</span><span class="comment">; number of k-cycles to write the fft-buffer</span>
kcount <span class="opc">init</span> 0
<span class="olabel">loop</span><span class="op">:</span>
ain <span class="opc">soundin</span> Sfile
fftin <span class="opc">pvsanal</span> ain, ifftsize, ioverlap, iwinsize, iwinshape
ibuf, ktim <span class="opc">pvsbuffer</span> fftin, ilen <span class="op">+</span> (ifftsize <span class="op">/</span> sr)
<span class="octrl">loop_lt</span> kcount, 1, kcycles, <span class="olabel">loop</span>
<span class="opc">xout</span> ibuf, ilen, ktim
<span class="octrl">endif</span>
<span class="oblock">endop</span>
<span class="oblock">instr</span> 1
istretch <span class="op">=</span> p4<span class="comment">; time stretching factor</span>
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>
ibuffer, ilen, k0 FileToPvsBuf "fox.wav", ifftsize, ioverlap, iwinsize, iwinshape
p3 <span class="op">=</span> istretch <span class="op">*</span> ilen<span class="comment">; set p3 to the correct value</span>
ktmpnt <span class="opc">linseg</span> 0, p3, ilen<span class="comment">; time pointer</span>
fread <span class="opc">pvsbufread</span> ktmpnt, ibuffer<span class="comment">; read the buffer</span>
aout <span class="opc">pvsadsyn</span> fread, 10, 1<span class="comment">; resynthesis with the first 10 bins</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 1 20
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
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<p><br class="example-break" />
</p>
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<div class="refsect1" title="See Also">
<a id="idp38106640"></a>
<h2>See Also</h2>
<p>
<a class="link" href="pvsanal.html" title="pvsanal"><em class="citetitle">pvsanal</em></a>,
<a class="link" href="pvsynth.html" title="pvsynth"><em class="citetitle">pvsynth</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="idp38108616"></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>
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<p>
</p>
<p>New in version 4.13</p>
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