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<refentry id="pvread">
<indexterm id="IndexPvread"><primary>pvread</primary></indexterm>
<refentryinfo><title>Spectral Processing:STFT</title></refentryinfo>
<refmeta>
<refentrytitle>pvread</refentrytitle>
</refmeta>
<refnamediv>
<refname>pvread</refname>
<refpurpose>
Reads from a phase vocoder analysis file and returns the frequency and amplitude from a single analysis channel or bin.
</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<para>
<emphasis>pvread</emphasis> reads from a <link linkend="pvoc"><citetitle>pvoc</citetitle></link> file and returns the frequency and amplitude from a single analysis channel or bin. The returned values can be used anywhere else in the Csound instrument. For example, one can use them as arguments to an oscillator to synthesize a single component from an analyzed signal or a bank of pvreads can be used to resynthesize the analyzed sound using additive synthesis by passing the frequency and magnitude values to a bank of oscillators.
</para>
</refsect1>
<refsect1>
<title>Syntax</title>
<synopsis>kfreq, kamp <command>pvread</command> ktimpnt, ifile, ibin</synopsis>
</refsect1>
<refsect1>
<title>Initialization</title>
<para>
<emphasis>ifile</emphasis> -- the <emphasis>pvoc</emphasis> number (n in pvoc.n) or the name in quotes of the analysis file made using pvanal. (See <link linkend="pvoc"><citetitle>pvoc</citetitle></link>.)
</para>
<para>
<emphasis>ibin</emphasis> -- the number of the analysis channel from which to return frequency in Hz and magnitude.
</para>
</refsect1>
<refsect1>
<title>Performance</title>
<para>
<emphasis>kfreq, kamp</emphasis> -- outputs of the <emphasis>pvread</emphasis> unit. These values, retrieved from a phase vocoder analysis file, represent the values of frequency and amplitude from a single analysis channel specified in the ibin argument. Interpolation between analysis frames is performed at k-rate resolution and dependent of course upon the rate and direction of ktimpnt.
</para>
<para>
<emphasis>ktimpnt</emphasis> -- the passage of time, in seconds, through this file. <emphasis>ktimpnt</emphasis> must always be positive, but can move forwards or backwards in time, be stationary or discontinuous, as a pointer into the analysis file.
</para>
</refsect1>
<refsect1>
<title>Examples</title>
<para>
The example below shows the use <emphasis>pvread</emphasis> to synthesize a single component from a phase vocoder analysis file. It should be noted that the <emphasis>kfreq</emphasis> and <emphasis>kamp</emphasis> outputs can be used for any kind of synthesis, filtering, processing, and so on.
</para>
<para>
<informalexample>
<programlisting>
ktime <emphasis>line</emphasis> 0, p3, 3
kfreq, kamp <emphasis>pvread</emphasis> ktime, "pvoc.file", 7 ; read
;data from 7th analysis bin.
asig <emphasis>oscili</emphasis> kamp, kfreq, 1 ; function 1
;is a stored sine
</programlisting>
</informalexample>
</para>
</refsect1>
<refsect1>
<title>See Also</title>
<para>
<link linkend="pvbufread"><citetitle>pvbufread</citetitle></link>,
<link linkend="pvcross"><citetitle>pvcross</citetitle></link>,
<link linkend="pvinterp"><citetitle>pvinterp</citetitle></link>,
<link linkend="tableseg"><citetitle>tableseg</citetitle></link>,
<link linkend="tablexseg"><citetitle>tablexseg</citetitle></link>
</para>
</refsect1>
<refsect1>
<title>Credits</title>
<para>
<simplelist>
<member>Author: Richard Karpen</member>
<member>Seattle, Wash</member>
<member>1997</member>
</simplelist>
</para>
<para>New in version 3.44</para>
</refsect1>
</refentry>
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