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<h2>
<span class="refentrytitle">pvsmaska</span>
</h2>
<p>pvsmaska —
Modify amplitudes using a function table, with dynamic scaling.
</p>
</div>
<div class="refsect1">
<a id="idm281472898450632"></a>
<h2>Description</h2>
<p>
Modify amplitudes of fsrc using function table, with dynamic scaling.
</p>
</div>
<div class="refsect1">
<a id="idm281472898449352"></a>
<h2>Syntax</h2>
<pre class="synopsis">fsig <span class="command"><strong>pvsmaska</strong></span> fsrc, ifn, kdepth</pre>
</div>
<div class="refsect1">
<a id="idm281472898447144"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>ifn</em></span> -- The f-table to use. Given fsrc has N analysis bins, table ifn must be of size N or larger. The table need not be normalized, but values should lie within the range 0 to 1. It can be supplied from the score in the usual way, or from within the orchestra by using <a class="link" href="pvsinfo.html" title="pvsinfo"><em class="citetitle">pvsinfo</em></a> to find the size of fsrc, (returned by pvsinfo in inbins), which can then be passed to ftgen to create the f-table.
</p>
</div>
<div class="refsect1">
<a id="idm281472898382600"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>kdepth</em></span> -- Controls the degree of modification applied to fsrc, using simple linear scaling. 0 leaves amplitudes unchanged, 1 applies the full profile of ifn.
</p>
<p>
Note that power-of-two FFT sizes are particularly convenient when using table-based processing, as the number of analysis bins (inbins) is then a power-of-two plus one, for which an exactly matching f-table can be created. In this case it is important that the f-table be created with a size of inbins, rather than as a power of two, as the latter will copy the first table value to the guard point, which is inappropriate for this opcode.
</p>
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</td>
<th align="left">Warning</th>
</tr>
<tr>
<td align="left" valign="top">
<p>
It is unsafe to use the same f-variable for both input and output of pvs opcodes. Using the same one might lead to undefined behavior on some opcodes. Use a different one on the left and right sides of the opcode.
</p>
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<div class="refsect1">
<a id="idm281472898378968"></a>
<h2>Examples</h2>
<p>
Here is an example of the use of the <span class="emphasis"><em>pvsmaska</em></span> opcode. It uses the file <a class="ulink" href="examples/pvsmaska.csd" target="_top"><em class="citetitle">pvsmaska.csd</em></a>.
</p>
<div class="example">
<a id="idm281472898376712"></a>
<p class="title">
<strong>Example 772. Example of the <span class="emphasis"><em>pvsmaska</em></span> 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="idm281472719494680"></a>
<pre class="programlisting">
<span class="nt"><CsoundSynthesizer></span>
<span class="nt"><CsOptions></span>
-odac
<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="c1">; function table for defining amplitude peaks (from the example of Richard Dobson)</span>
gi<span class="n">Tab</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">513</span><span class="p">,</span> <span class="mi">8</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">3</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">4</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">6</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">10</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">12</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">16</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">32</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="mi">0</span><span class="p">,</span> <span class="mi">436</span><span class="p">,</span> <span class="mi">0</span>
<span class="kd">instr</span> <span class="nf">1</span>
i<span class="n">mod</span> <span class="o">=</span> <span class="nb">p4</span><span class="c1">; degree of midification (0-1)</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>
S<span class="n">file</span> <span class="o">=</span> <span class="s">"fox.wav"</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><span class="c1">; fft-analysis of file</span>
<span class="n">fmask</span> <span class="nb">pvsmaska</span> <span class="n">fftin</span><span class="p">,</span> gi<span class="n">Tab</span><span class="p">,</span> i<span class="n">mod</span>
a<span class="n">out</span> <span class="nb">pvsynth</span> <span class="n">fmask</span><span class="c1">; resynthesize</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="mf">2.757</span> <span class="mi">0</span>
<span class="nb">i</span> <span class="mi">1</span> <span class="mi">3</span> <span class="mf">2.757</span> <span class="mi">1</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="idm281472898371992"></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="idm281472898368024"></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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