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<h2>
<span class="refentrytitle">pvsftw</span>
</h2>
<p>pvsftw —
Writes amplitude and/or frequency data to function tables.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp38773512"></a>
<h2>Description</h2>
<p>
Writes amplitude and/or frequency data to function tables.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp38774184"></a>
<h2>Syntax</h2>
<pre class="synopsis">kflag <span class="command"><strong>pvsftw</strong></span> fsrc, ifna [, ifnf]</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp38784704"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>ifna</em></span> -- A table, at least inbins in size, that stores amplitude data. Ignored if ifna = 0
</p>
<p>
<span class="emphasis"><em>ifnf</em></span> -- A table, at least inbins in size, that stores frequency data. Ignored if ifnf = 0
</p>
</div>
<div class="refsect1" title="Performance">
<a id="idp38786104"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>kflag</em></span> -- A flag that has the value of 1 when new data is available, 0 otherwise.
</p>
<p>
<span class="emphasis"><em>fsrc</em></span> -- a PVOC-EX formatted source.
</p>
<p>
Enables the contents of <span class="emphasis"><em>fsrc</em></span> to be exchanged with function tables, for custom processing. Except when the frame overlap equals <span class="emphasis"><em>ksmps</em></span> (which will generally not be the case), the frame data is not updated each control period. The data in <span class="emphasis"><em>ifna</em></span>, <span class="emphasis"><em>ifnf</em></span> should only be processed when <span class="emphasis"><em>kflag</em></span> is set to 1. To process only frequency data, set <span class="emphasis"><em>ifna</em></span> to zero.
</p>
<p>
As the functions tables are required only to store data from <span class="emphasis"><em>fsrc</em></span>, there is no advantage in defining then in the score. They should generally be created in the instrument using <a class="link" href="ftgen.html" title="ftgen"><em class="citetitle">ftgen</em></a>.
</p>
<p>
By exporting amplitude data, say, from one fsig and importing it into another, basic cross-synthesis (as in <a class="link" href="pvscross.html" title="pvscross"><em class="citetitle">pvscross</em></a>) can be performed, with the option to modify the data beforehand using the table manipulation opodes.
</p>
<p>
Note that the format data in the source fsig is not written to the tables. This therefore offers a means of transferring amplitude and frequency data between non-identical fsigs. Used this way, these opcodes become potentially pathological, and can be relied upon to produce unexpected results. In such cases, resynthesis using <a class="link" href="pvsadsyn.html" title="pvsadsyn"><em class="citetitle">pvsadsyn</em></a> would almost certainly be required.
</p>
<p>
To perform a straight copy from one fsig to another one of identical format, the conventional assignment syntax can be used:
</p>
<div class="literallayout">
<p> <br />
fsig1 = fsig2<br />
</p>
</div>
<p>
It is not necessary to use function tables in this case.
</p>
</div>
<div class="refsect1" title="Examples">
<a id="idp38832176"></a>
<h2>Examples</h2>
<p>
Here is an example of the pvsftw opcode. It uses the file <a class="ulink" href="examples/pvsftw.csd" target="_top"><em class="citetitle">pvsftw.csd</em></a>.
</p>
<div class="example">
<a id="idp38833144"></a>
<p class="title">
<strong>Example 658. Example of the pvsftw 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>
-odac <span class="comment">;;;realtime audio out</span>
<span class="comment">;-iadc ;;;uncomment -iadc if realtime audio input is needed too</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o pvsftw.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> 32
<span class="ohdr">nchnls</span> <span class="op">=</span> 2
<span class="ohdr">0dbfs</span> <span class="op">=</span> 1
<span class="oblock">instr</span> 1
inbins <span class="op">=</span> 512
ifn <span class="ohdr">ftgen</span> 0,0,inbins,10,1 <span class="comment">; make ftable</span>
fsrc <span class="opc">pvsdiskin</span> "fox.pvx", 1, 1 <span class="comment">; read PVOCEX file</span>
kflag <span class="opc">pvsftw</span> fsrc,ifn <span class="comment">; export amps to table,</span>
kamp <span class="opc">init</span> 0
<span class="octrl">if</span> kflag<span class="op">==</span>0 <span class="octrl">kgoto</span> <span class="olabel">contin</span> <span class="comment">; only proc when frame is ready </span>
<span class="opc">tablew</span> kamp,1,ifn <span class="comment">; kill lowest bins, for obvious effect</span>
<span class="opc">tablew</span> kamp,2,ifn
<span class="opc">tablew</span> kamp,3,ifn
<span class="opc">tablew</span> kamp,4,ifn
<span class="comment">; read modified data back to fsrc</span>
<span class="opc">pvsftr</span> fsrc,ifn
<span class="olabel">contin</span><span class="op">:</span>
<span class="comment">; and resynth</span>
aout <span class="opc">pvsynth</span> fsrc
<span class="opc">outs</span> aout, aout
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">i</span> 1 0 4
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
</div>
<p><br class="example-break" />
</p>
</div>
<div class="refsect1" title="See Also">
<a id="idp38835416"></a>
<h2>See Also</h2>
<p>
<a class="link" href="pvsftr.html" title="pvsftr"><em class="citetitle">pvsftr</em></a>
</p>
</div>
<div class="refsect1" title="Credits">
<a id="idp38836432"></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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