<?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>pvstrace</title>
<link rel="stylesheet" type="text/css" href="csound.css" />
<link rel="stylesheet" type="text/css" href="syntax-highlighting.css" />
<meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" />
<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="pvstencil.html" title="pvstencil" />
<link rel="next" href="pvsvoc.html" title="pvsvoc" />
</head>
<body>
<div class="navheader">
<table width="100%" summary="Navigation header">
<tr>
<th colspan="3" align="center">pvstrace</th>
</tr>
<tr>
<td width="20%" align="left"><a accesskey="p" href="pvstencil.html">Prev</a> </td>
<th width="60%" align="center">Orchestra Opcodes and Operators</th>
<td width="20%" align="right"> <a accesskey="n" href="pvsvoc.html">Next</a></td>
</tr>
</table>
<hr />
</div>
<div class="refentry">
<a id="pvstrace"></a>
<div class="titlepage"></div>
<a id="IndexPvstrace" class="indexterm"></a>
<div class="refnamediv">
<h2>
<span class="refentrytitle">pvstrace</span>
</h2>
<p>pvstrace —
Retain only the N loudest bins.
</p>
</div>
<div class="refsect1">
<a id="idm281472897885464"></a>
<h2>Description</h2>
<p>
Process a PV stream by retaining only the N bins with the
highest amplitude, zeroing the others.
</p>
</div>
<div class="refsect1">
<a id="idm281472897894712"></a>
<h2>Syntax</h2>
<pre class="synopsis">fsig <span class="command"><strong>pvstrace</strong></span> fsigin, kn </pre>
</div>
<div class="refsect1">
<a id="idm281472897892504"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>fsig</em></span> -- output pv stream
</p>
<p>
<span class="emphasis"><em>fsigin</em></span> -- input pv stream
</p>
<p>
<span class="emphasis"><em>kn</em></span> -- number of bins to be retained
</p>
<div class="warning" style="margin-left: 0.5in; margin-right: 0.5in;">
<table border="0" summary="Warning">
<tr>
<td rowspan="2" align="center" valign="top" width="25">
<img alt="[Warning]" src="images/warning.png" />
</td>
<th align="left">Warning</th>
</tr>
<tr>
<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>
</td>
</tr>
</table>
</div>
</div>
<div class="refsect1">
<a id="idm281472897818264"></a>
<h2>Examples</h2>
<p>
Here is an example of the use of the <span class="emphasis"><em>pvstrace</em></span> opcode. It uses the file <a class="ulink" href="examples/pvstrace.csd" target="_top"><em class="citetitle">pvstrace.csd</em></a>.
</p>
<div class="example">
<a id="idm281472897815960"></a>
<p class="title">
<strong>Example 782. Example of the <span class="emphasis"><em>pvstrace</em></span> 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>
<div class="refsect1">
<a id="idm281472718736632"></a>
<pre class="programlisting">
<span class="nt"><CsoundSynthesizer></span>
<span class="nt"><CsOptions></span>
<span class="c1">; Select audio/midi flags here according to platform</span>
-odac <span class="c1">;;;realtime audio out</span>
<span class="c1">;-iadc ;;;uncomment -iadc if realtime audio input is needed too</span>
<span class="c1">; For Non-realtime ouput leave only the line below:</span>
<span class="c1">; -o pvstrace.wav -W ;;; for file output any platform</span>
<span class="nt"></CsOptions></span>
<span class="nt"><CsInstruments></span>
<span class="vg">sr</span> <span class="o">=</span> <span class="mi">44100</span>
<span class="vg">ksmps</span> <span class="o">=</span> <span class="mi">32</span>
<span class="vg">nchnls</span> <span class="o">=</span> <span class="mi">2</span>
<span class="vg">0dbfs</span> <span class="o">=</span> <span class="mi">1</span>
<span class="kd">instr</span> <span class="nf">1</span>
k<span class="n">n</span> <span class="o">=</span> <span class="nb">p4</span>
a<span class="n">sig</span> <span class="nb">diskin2</span> <span class="s">"beats.wav"</span><span class="p">,</span> <span class="mi">1</span>
<span class="n">fsig</span> <span class="nb">pvsanal</span> a<span class="n">sig</span><span class="p">,</span> <span class="mi">1024</span><span class="p">,</span> <span class="mi">256</span><span class="p">,</span> <span class="mi">1024</span><span class="p">,</span> <span class="mi">1</span><span class="c1">; analyse it</span>
<span class="n">ftps</span> <span class="n">pvstrace</span> <span class="n">fsig</span><span class="p">,</span> k<span class="n">n</span> <span class="c1">; keep kn bins</span>
a<span class="n">tps</span> <span class="nb">pvsynth</span> <span class="n">ftps</span> <span class="c1">; synthesise it</span>
<span class="nb">outs</span> a<span class="n">tps</span><span class="p">,</span> a<span class="n">tps</span>
<span class="kd">endin</span>
<span class="nt"></CsInstruments></span>
<span class="nt"><CsScore></span>
<span class="nb">i</span><span class="mi">1</span> <span class="mi">0</span> <span class="mi">2</span> <span class="mi">5</span>
<span class="nb">i</span><span class="mi">1</span> <span class="o">+</span> <span class="mi">2</span> <span class="mi">10</span>
<span class="nb">i</span><span class="mi">1</span> <span class="o">+</span> <span class="mi">2</span> <span class="mi">20</span>
<span class="nb">i</span><span class="mi">1</span> <span class="o">+</span> <span class="mi">2</span> <span class="mi">40</span>
<span class="nb">i</span><span class="mi">1</span> <span class="o">+</span> <span class="mi">2</span> <span class="mi">80</span>
<span class="nb">i</span><span class="mi">1</span> <span class="o">+</span> <span class="mi">2</span> <span class="mi">160</span>
<span class="nb">e</span>
<span class="nt"></CsScore></span>
<span class="nt"></CsoundSynthesizer></span>
</pre>
</div>
</div>
</div>
<p><br class="example-break" />
</p>
</div>
<div class="refsect1">
<a id="idm281472897811336"></a>
<h2>See Also</h2>
<p>
<a class="link" href="pvsanal.html" title="pvsanal"><em class="citetitle">pvsanal</em></a>,
<a class="link" href="pvsynth.html" title="pvsynth"><em class="citetitle">pvsynth</em></a>,
<a class="link" href="pvsadsyn.html" title="pvsadsyn"><em class="citetitle">pvsadsyn</em></a>
</p>
</div>
<div class="refsect1">
<a id="idm281472897807368"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Victor Lazzarini</td>
</tr>
<tr>
<td>2017 </td>
</tr>
</table>
<p>
</p>
<p>New plugin in version 6.09</p>
</div>
</div>
<div class="navfooter">
<hr />
<table width="100%" summary="Navigation footer">
<tr>
<td width="40%" align="left"><a accesskey="p" href="pvstencil.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="pvsvoc.html">Next</a></td>
</tr>
<tr>
<td width="40%" align="left" valign="top">pvstencil </td>
<td width="20%" align="center">
<a accesskey="h" href="index.html">Home</a>
</td>
<td width="40%" align="right" valign="top"> pvsvoc</td>
</tr>
</table>
</div>
</body>
</html>
distrib
>
Mageia
>
7
>
armv7hl
>
media
>
core-release
>
by-pkgid
>
5fcfcb7517038d1f44ab4e478e6e61fa
>
files
>
2748
