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<h2>
<span class="refentrytitle">pvsadsyn</span>
</h2>
<p>pvsadsyn —
Resynthesize using a fast oscillator-bank.
</p>
</div>
<div class="refsect1">
<a id="idm281472900400088"></a>
<h2>Description</h2>
<p>
Resynthesize using a fast oscillator-bank.
</p>
</div>
<div class="refsect1">
<a id="idm281472900318968"></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">
<a id="idm281472900316792"></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">
<a id="idm281472900310424"></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">
<a id="idm281472900304808"></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="idm281472900302952"></a>
<p class="title">
<strong>Example 737. 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>
<div class="refsect1">
<a id="idm281472721588888"></a>
<pre class="programlisting">
<span class="nt"><CsoundSynthesizer></span>
<span class="nt"><CsOptions></span>
<span class="c1">; Select audio/midi flags here according to platform</span>
<span class="c1">; Audio out Audio in</span>
-odac <span class="c1">;;;RT audio I/O</span>
<span class="c1">; For Non-realtime ouput leave only the line below:</span>
<span class="c1">; -o pvsadsyn.wav -W ;;; for file output any platform</span>
<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">16</span>
<span class="vg">nchnls</span> <span class="o">=</span> <span class="mi">1</span>
<span class="vg">0dbfs</span> <span class="o">=</span> <span class="mi">1</span>
<span class="c1">;; example written by joachim heintz 2009</span>
<span class="kd">opcode</span> <span class="nf">FileToPvsBuf</span><span class="p">,</span> <span class="kt">iik</span><span class="p">,</span> <span class="kt">Siiii</span>
<span class="c1">;;writes an audio file at the first k-cycle to a fft-buffer (via pvsbuffer)</span>
S<span class="n">file</span><span class="p">,</span> i<span class="n">fftsize</span><span class="p">,</span> i<span class="n">overlap</span><span class="p">,</span> i<span class="n">winsize</span><span class="p">,</span> i<span class="n">winshape</span> <span class="nb">xin</span>
k<span class="n">timek</span> <span class="nb">timeinstk</span>
<span class="k">if</span> k<span class="n">timek</span> <span class="o">==</span> <span class="mi">1</span> <span class="k">then</span>
i<span class="n">len</span> <span class="nb">filelen</span> S<span class="n">file</span>
k<span class="n">cycles</span> <span class="o">=</span> i<span class="n">len</span> <span class="o">*</span> <span class="vg">kr</span><span class="c1">; number of k-cycles to write the fft-buffer</span>
k<span class="n">count</span> <span class="nb">init</span> <span class="mi">0</span>
<span class="nl">loop</span><span class="p">:</span>
a<span class="n">in</span> <span class="nb">soundin</span> S<span class="n">file</span>
<span class="n">fftin</span> <span class="nb">pvsanal</span> a<span class="n">in</span><span class="p">,</span> i<span class="n">fftsize</span><span class="p">,</span> i<span class="n">overlap</span><span class="p">,</span> i<span class="n">winsize</span><span class="p">,</span> i<span class="n">winshape</span>
i<span class="n">buf</span><span class="p">,</span> k<span class="n">tim</span> <span class="nb">pvsbuffer</span> <span class="n">fftin</span><span class="p">,</span> i<span class="n">len</span> <span class="o">+</span> <span class="p">(</span>i<span class="n">fftsize</span> <span class="o">/</span> <span class="vg">sr</span><span class="p">)</span>
<span class="k">loop_lt</span> k<span class="n">count</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> k<span class="n">cycles</span><span class="p">,</span> <span class="nl">loop</span>
<span class="nb">xout</span> i<span class="n">buf</span><span class="p">,</span> i<span class="n">len</span><span class="p">,</span> k<span class="n">tim</span>
<span class="k">endif</span>
<span class="kd">endop</span>
<span class="kd">instr</span> <span class="nf">1</span>
i<span class="n">stretch</span> <span class="o">=</span> <span class="nb">p4</span><span class="c1">; time stretching factor</span>
i<span class="n">fftsize</span> <span class="o">=</span> <span class="mi">1024</span>
i<span class="n">overlap</span> <span class="o">=</span> i<span class="n">fftsize</span> <span class="o">/</span> <span class="mi">4</span>
i<span class="n">winsize</span> <span class="o">=</span> i<span class="n">fftsize</span>
i<span class="n">winshape</span> <span class="o">=</span> <span class="mi">1</span><span class="c1">; von-Hann window</span>
i<span class="n">buffer</span><span class="p">,</span> i<span class="n">len</span><span class="p">,</span> k<span class="n">0</span> <span class="nf">FileToPvsBuf</span> <span class="s">"fox.wav"</span><span class="p">,</span> i<span class="n">fftsize</span><span class="p">,</span> i<span class="n">overlap</span><span class="p">,</span> i<span class="n">winsize</span><span class="p">,</span> i<span class="n">winshape</span>
<span class="nb">p3</span> <span class="o">=</span> i<span class="n">stretch</span> <span class="o">*</span> i<span class="n">len</span><span class="c1">; set p3 to the correct value</span>
k<span class="n">tmpnt</span> <span class="nb">linseg</span> <span class="mi">0</span><span class="p">,</span> <span class="nb">p3</span><span class="p">,</span> i<span class="n">len</span><span class="c1">; time pointer</span>
<span class="n">fread</span> <span class="nb">pvsbufread</span> k<span class="n">tmpnt</span><span class="p">,</span> i<span class="n">buffer</span><span class="c1">; read the buffer</span>
a<span class="n">out</span> <span class="nb">pvsadsyn</span> <span class="n">fread</span><span class="p">,</span> <span class="mi">10</span><span class="p">,</span> <span class="mi">1</span><span class="c1">; resynthesis with the first 10 bins</span>
<span class="nb">out</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">1</span> <span class="mi">20</span>
<span class="nb">e</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="idm281472900298664"></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">
<a id="idm281472900294696"></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>
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