<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>pvread</title>
<link rel="stylesheet" href="csound.css" type="text/css" />
<meta name="generator" content="DocBook XSL Stylesheets V1.75.2" />
<link rel="home" href="index.html" title="The Canonical Csound Reference Manual" />
<link rel="up" href="OpcodesTop.html" title="Orchestra Opcodes and Operators" />
<link rel="prev" href="pvoc.html" title="pvoc" />
<link rel="next" href="pvsadsyn.html" title="pvsadsyn" />
</head>
<body>
<div class="navheader">
<table width="100%" summary="Navigation header">
<tr>
<th colspan="3" align="center">pvread</th>
</tr>
<tr>
<td width="20%" align="left"><a accesskey="p" href="pvoc.html">Prev</a> </td>
<th width="60%" align="center">Orchestra Opcodes and Operators</th>
<td width="20%" align="right"> <a accesskey="n" href="pvsadsyn.html">Next</a></td>
</tr>
</table>
<hr />
</div>
<div class="refentry" title="pvread">
<a id="pvread"></a>
<div class="titlepage"></div>
<a id="IndexPvread" class="indexterm"></a>
<div class="refnamediv">
<h2>
<span class="refentrytitle">pvread</span>
</h2>
<p>pvread —
Reads from a phase vocoder analysis file and returns the frequency and amplitude from a single analysis channel or bin.
</p>
</div>
<div class="refsect1" title="Description">
<a id="id3124510"></a>
<h2>Description</h2>
<p>
<span class="emphasis"><em>pvread</em></span> reads from a <a class="link" href="pvoc.html" title="pvoc"><em class="citetitle">pvoc</em></a> 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.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="id3125373"></a>
<h2>Syntax</h2>
<pre class="synopsis">kfreq, kamp <span class="command"><strong>pvread</strong></span> ktimpnt, ifile, ibin</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="id3125392"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>ifile</em></span> -- the <span class="emphasis"><em>pvoc</em></span> number (n in pvoc.n) or the name in quotes of the analysis file made using pvanal. (See <a class="link" href="pvoc.html" title="pvoc"><em class="citetitle">pvoc</em></a>.)
</p>
<p>
<span class="emphasis"><em>ibin</em></span> -- the number of the analysis channel from which to return frequency in Hz and magnitude.
</p>
</div>
<div class="refsect1" title="Performance">
<a id="id3125427"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>kfreq, kamp</em></span> -- outputs of the <span class="emphasis"><em>pvread</em></span> 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.
</p>
<p>
<span class="emphasis"><em>ktimpnt</em></span> -- the passage of time, in seconds, through this file. <span class="emphasis"><em>ktimpnt</em></span> must always be positive, but can move forwards or backwards in time, be stationary or discontinuous, as a pointer into the analysis file.
</p>
</div>
<div class="refsect1" title="Examples">
<a id="id3125463"></a>
<h2>Examples</h2>
<p>
The example below shows the use <span class="emphasis"><em>pvread</em></span> to synthesize a single component from a phase vocoder analysis file. It should be noted that the <span class="emphasis"><em>kfreq</em></span> and <span class="emphasis"><em>kamp</em></span> outputs can be used for any kind of synthesis, filtering, processing, and so on.
</p>
<p>
</p>
<div class="informalexample">
<pre class="programlisting">
ktime <span class="emphasis"><em>line</em></span> 0, p3, 3
kfreq, kamp <span class="emphasis"><em>pvread</em></span> ktime, "pvoc.file", 7 ; read
;data from 7th analysis bin.
asig <span class="emphasis"><em>oscili</em></span> kamp, kfreq, 1 ; function 1
;is a stored sine
</pre>
</div>
<p>
</p>
</div>
<div class="refsect1" title="See Also">
<a id="id3125517"></a>
<h2>See Also</h2>
<p>
<a class="link" href="pvbufread.html" title="pvbufread"><em class="citetitle">pvbufread</em></a>,
<a class="link" href="pvcross.html" title="pvcross"><em class="citetitle">pvcross</em></a>,
<a class="link" href="pvinterp.html" title="pvinterp"><em class="citetitle">pvinterp</em></a>,
<a class="link" href="tableseg.html" title="tableseg"><em class="citetitle">tableseg</em></a>,
<a class="link" href="tablexseg.html" title="tablexseg"><em class="citetitle">tablexseg</em></a>
</p>
</div>
<div class="refsect1" title="Credits">
<a id="id3125567"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Richard Karpen</td>
</tr>
<tr>
<td>Seattle, Wash</td>
</tr>
<tr>
<td>1997</td>
</tr>
</table>
<p>
</p>
<p>New in version 3.44</p>
</div>
</div>
<div class="navfooter">
<hr />
<table width="100%" summary="Navigation footer">
<tr>
<td width="40%" align="left"><a accesskey="p" href="pvoc.html">Prev</a> </td>
<td width="20%" align="center">
<a accesskey="u" href="OpcodesTop.html">Up</a>
</td>
<td width="40%" align="right"> <a accesskey="n" href="pvsadsyn.html">Next</a></td>
</tr>
<tr>
<td width="40%" align="left" valign="top">pvoc </td>
<td width="20%" align="center">
<a accesskey="h" href="index.html">Home</a>
</td>
<td width="40%" align="right" valign="top"> pvsadsyn</td>
</tr>
</table>
</div>
</body>
</html>
