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<div class="refentry" title="pvsvoc">
<a id="pvsvoc"></a>
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<a id="Indexpvsvoc" class="indexterm"></a>
<div class="refnamediv">
<h2>
<span class="refentrytitle">pvsvoc</span>
</h2>
<p>pvsvoc —
Combine the spectral envelope of one fsig with the excitation (frequencies) of another.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp39342144"></a>
<h2>Description</h2>
<p>
This opcode provides support for cross-synthesis of amplitudes and frequencies. It takes
the amplitudes of one input fsig and combines with frequencies from another. It is a spectral
version of the well-known channel vocoder.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp39342984"></a>
<h2>Syntax</h2>
<pre class="synopsis">fsig <span class="command"><strong>pvsvoc</strong></span> famp, fexc, kdepth, kgain [,kcoefs]</pre>
</div>
<div class="refsect1" title="Performance">
<a id="idp39353384"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>fsig</em></span> -- output pv stream
</p>
<p>
<span class="emphasis"><em>famp</em></span> -- input pv stream from which the amplitudes will be extracted
</p>
<p>
<span class="emphasis"><em>fexc</em></span> -- input pv stream from which the frequencies will be taken
</p>
<p>
<span class="emphasis"><em>kdepth</em></span> -- depth of effect, affecting how much of the frequencies will
be taken from the second fsig: 0, the output is the famp signal, 1 the output is the famp
amplitudes and fexc frequencies.
</p>
<p>
<span class="emphasis"><em>kgain</em></span> -- gain boost/attenuation applied to the output.
</p>
<p>
<span class="emphasis"><em>kcoefs</em></span> -- number of cepstrum coefs used in spectral envelope estimation (defaults to 80).
</p>
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<th align="left">Warning</th>
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<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" title="Examples">
<a id="idp39391296"></a>
<h2>Examples</h2>
<p>
Here is an example of the pvsvoc opcode. It uses the file <a class="ulink" href="examples/pvsvoc.csd" target="_top"><em class="citetitle">pvsvoc.csd</em></a>.
</p>
<div class="example">
<a id="idp39392264"></a>
<p class="title">
<strong>Example 678. Example of the pvsvoc 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 pvsvoc.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
gisaw <span class="ohdr">ftgen</span> 1, 0, 2048, 10, 1, 0.5, 0.3, 0.25, 0.2 <span class="comment">;sawtooth-like</span>
<span class="oblock">instr</span> 1
asig <span class="opc">in</span> <span class="comment">;get the signal in</span>
asyn <span class="opc">poscil</span> .6, 150, gisaw <span class="comment">;excitation signal of 150 Hz</span>
famp <span class="opc">pvsanal</span> asig, 1024, 256, 1024, 1 <span class="comment">;analyse in signal</span>
fexc <span class="opc">pvsanal</span> asyn, 1024, 256, 1024, 1 <span class="comment">;analyse excitation signal</span>
ftps <span class="opc">pvsvoc</span> famp, fexc, 1, 1 <span class="comment">;cross it</span>
atps <span class="opc">pvsynth</span> ftps <span class="comment">;synthesise it </span>
<span class="opc">outs</span> atps, atps
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">i</span> 1 0 10
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
</div>
<p><br class="example-break" />
</p>
<p>
The example above shows a typical cross-synthesis operation. The input signal (say a vocal sound) is used for its amplitude spectrum. An oscillator with an arbitrary complex waveform produces the excitation signal, giving the vocal sound its pitch.
</p>
</div>
<div class="refsect1" title="Credits">
<a id="idp39394992"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Victor Lazzarini</td>
</tr>
<tr>
<td>April 2005 </td>
</tr>
</table>
<p>
</p>
<p>New plugin in version 5</p>
<p>April 2005.</p>
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