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<refentry id="pvsvoc">
<indexterm id="Indexpvsvoc"><primary>pvsvoc</primary></indexterm>
<refentryinfo><title>Spectral Processing:Streaming</title></refentryinfo>
<refmeta>
<refentrytitle>pvsvoc</refentrytitle>
</refmeta>
<refnamediv>
<refname>pvsvoc</refname>
<refpurpose>
Combine the spectral envelope of one fsig with the excitation (frequencies) of another.
</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<para>
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.
</para>
</refsect1>
<refsect1>
<title>Syntax</title>
<synopsis>fsig <command>pvsvoc</command> famp, fexc, kdepth, kgain [,kcoefs]</synopsis>
</refsect1>
<refsect1>
<title>Performance</title>
<para>
<emphasis>fsig</emphasis> -- output pv stream
</para>
<para>
<emphasis>famp</emphasis> -- input pv stream from which the amplitudes will be extracted
</para>
<para>
<emphasis>fexc</emphasis> -- input pv stream from which the frequencies will be taken
</para>
<para>
<emphasis>kdepth</emphasis> -- 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.
</para>
<para>
<emphasis>kgain</emphasis> -- gain boost/attenuation applied to the output.
</para>
<para>
<emphasis>kcoefs</emphasis> -- number of cepstrum coefs used in spectral envelope estimation (defaults to 80).
</para>
<warning>
<para>
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.
</para>
</warning>
</refsect1>
<refsect1>
<title>Examples</title>
<para>
Here is an example of the pvsvoc opcode. It uses the file <ulink url="examples/pvsvoc.csd"><citetitle>pvsvoc.csd</citetitle></ulink>.
<example>
<title>Example of the pvsvoc opcode.</title>
<para>See the sections <link linkend="UsingRealTime"><citetitle>Real-time Audio</citetitle></link> and <link linkend="CommandFlags"><citetitle>Command Line Flags</citetitle></link> for more information on using command line flags.</para>
<xi:include href="examples-xml/pvsvoc.csd.xml" xmlns:xi="http://www.w3.org/2001/XInclude"/>
</example>
</para>
<para>
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.
</para>
</refsect1>
<refsect1>
<title>Credits</title>
<para>
<simplelist>
<member>Author: &namevictor;</member>
<member>April 2005 </member>
</simplelist>
</para>
<para>New plugin in version 5</para>
<para>April 2005.</para>
</refsect1>
</refentry>
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