<?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>cpsxpch</title>
<link rel="stylesheet" type="text/css" href="csound.css" />
<meta name="generator" content="DocBook XSL Stylesheets V1.76.1" />
<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="cpstuni.html" title="cpstuni" />
<link rel="next" href="cpumeter.html" title="cpumeter" />
</head>
<body>
<div class="navheader">
<table width="100%" summary="Navigation header">
<tr>
<th colspan="3" align="center">cpsxpch</th>
</tr>
<tr>
<td width="20%" align="left"><a accesskey="p" href="cpstuni.html">Prev</a> </td>
<th width="60%" align="center">Orchestra Opcodes and Operators</th>
<td width="20%" align="right"> <a accesskey="n" href="cpumeter.html">Next</a></td>
</tr>
</table>
<hr />
</div>
<div class="refentry" title="cpsxpch">
<a id="cpsxpch"></a>
<div class="titlepage"></div>
<a id="IndexCpsxpch" class="indexterm"></a>
<div class="refnamediv">
<h2>
<span class="refentrytitle">cpsxpch</span>
</h2>
<p>cpsxpch —
Converts a pitch-class value into cycles-per-second (Hz) for equal divisions of any interval.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp17126528"></a>
<h2>Description</h2>
<p>
Converts a pitch-class value into cycles-per-second (Hz) for equal divisions of any interval. There is a restriction of no more than 100 equal divisions.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp17127472"></a>
<h2>Syntax</h2>
<pre class="synopsis">icps <span class="command"><strong>cpsxpch</strong></span> ipch, iequal, irepeat, ibase</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp17128600"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>ipch</em></span> -- Input number of the form 8ve.pc, indicating an 'octave' and which note in the octave.
</p>
<p>
<span class="emphasis"><em>iequal</em></span> -- if positive, the number of equal intervals into which the 'octave' is divided. Must be less than or equal to 100. If negative, is the number of a table of frequency multipliers.
</p>
<p>
<span class="emphasis"><em>irepeat</em></span> -- Number indicating the interval which is the 'octave.' The integer 2 corresponds to octave divisions, 3 to a twelfth, 4 is two octaves, and so on. This need not be an integer, but must be positive.
</p>
<p>
<span class="emphasis"><em>ibase</em></span> -- The frequency which corresponds to pitch 0.0
</p>
<div class="note" title="Note" style="margin-left: 0.5in; margin-right: 0.5in;">
<table border="0" summary="Note: Note">
<tr>
<td rowspan="2" align="center" valign="top" width="25">
<img alt="[Note]" src="images/note.png" />
</td>
<th align="left">Note</th>
</tr>
<tr>
<td align="left" valign="top">
<p>
</p>
<div class="orderedlist">
<ol class="orderedlist" type="1">
<li class="listitem">
<p>The following are essentially the same
</p>
<pre class="programlisting">
ia <span class="op">=</span> <span class="opc">cpspch</span>(8.02)
ib <span class="opc">cps2pch</span> 8.02, 12
ic <span class="opc">cpsxpch</span> 8.02, 12, 2, 1.02197503906</pre>
<p>
</p>
</li>
<li class="listitem">
<p>
These are opcodes not functions
</p>
</li>
<li class="listitem">
<p>
Negative values of <span class="emphasis"><em>ipch</em></span> are allowed, but not negative <span class="emphasis"><em>irepeat</em></span>, <span class="emphasis"><em>iequal</em></span> or <span class="emphasis"><em>ibase</em></span>.
</p>
</li>
</ol>
</div>
<p>
</p>
</td>
</tr>
</table>
</div>
</div>
<div class="refsect1" title="Examples">
<a id="idp17137032"></a>
<h2>Examples</h2>
<p>
Here is an example of the cpsxpch opcode. It uses the file <a class="ulink" href="examples/cpsxpch.csd" target="_top"><em class="citetitle">cpsxpch.csd</em></a>.
</p>
<div class="example">
<a id="idp17138016"></a>
<p class="title">
<strong>Example 139. Example of the cpsxpch 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>
<span class="comment">; Audio out Audio in</span>
-odac -iadc <span class="comment">;;;RT audio I/O</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o cpsxpch.wav -W ;;; for file output any platform</span>
<span class="csdtag"></CsOptions></span>
<span class="csdtag"><CsInstruments></span>
<span class="comment">; Initialize the global variables.</span>
<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">kr</span> <span class="op">=</span> 4410
<span class="ohdr">ksmps</span> <span class="op">=</span> 10
<span class="ohdr">nchnls</span> <span class="op">=</span> 1
<span class="comment">; Instrument #1.</span>
<span class="oblock">instr</span> 1
<span class="comment">; Use a normal twelve-tone scale.</span>
ipch <span class="op">=</span> 8.02
iequal <span class="op">=</span> 12
irepeat <span class="op">=</span> 2
ibase <span class="op">=</span> 1.02197503906
icps <span class="opc">cpsxpch</span> ipch, iequal, irepeat, ibase
<span class="opc">print</span> icps
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="comment">; Play Instrument #1 for one second.</span>
<span class="stamnt">i</span> 1 0 1
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
</div>
<p><br class="example-break" />
Its output should include lines like this:
</p>
<pre class="screen">instr 1: icps = 293.666</pre>
<p>
</p>
<p>
Here is an example of the cpsxpch opcode using a 10.5 ET scale. It uses the file <a class="ulink" href="examples/cpsxpch_105et.csd" target="_top"><em class="citetitle">cpsxpch_105et.csd</em></a>.
</p>
<div class="example">
<a id="idp17141352"></a>
<p class="title">
<strong>Example 140. Example of the cpsxpch opcode using a 10.5 ET scale.</strong>
</p>
<div class="example-contents">
<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>
<span class="comment">; Audio out Audio in</span>
-odac -iadc <span class="comment">;;;RT audio I/O</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o cpsxpch_105et.wav -W ;;; for file output any platform</span>
<span class="csdtag"></CsOptions></span>
<span class="csdtag"><CsInstruments></span>
<span class="comment">; Initialize the global variables.</span>
<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">kr</span> <span class="op">=</span> 4410
<span class="ohdr">ksmps</span> <span class="op">=</span> 10
<span class="ohdr">nchnls</span> <span class="op">=</span> 1
<span class="comment">; Instrument #1.</span>
<span class="oblock">instr</span> 1
<span class="comment">; Use a 10.5ET scale.</span>
ipch <span class="op">=</span> 4.02
iequal <span class="op">=</span> 21
irepeat <span class="op">=</span> 4
ibase <span class="op">=</span> 16.35160062496
icps <span class="opc">cpsxpch</span> ipch, iequal, irepeat, ibase
<span class="opc">print</span> icps
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="comment">; Play Instrument #1 for one second.</span>
<span class="stamnt">i</span> 1 0 1
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
</div>
<p><br class="example-break" />
Its output should include lines like this:
</p>
<pre class="screen">instr 1: icps = 4776.824</pre>
<p>
</p>
<p>
Here is an example of the cpsxpch opcode using a Pierce scale centered on middle A. It uses the file <a class="ulink" href="examples/cpsxpch_pierce.csd" target="_top"><em class="citetitle">cpsxpch_pierce.csd</em></a>.
</p>
<div class="example">
<a id="idp17143464"></a>
<p class="title">
<strong>Example 141. Example of the cpsxpch opcode using a Pierce scale centered on middle A.</strong>
</p>
<div class="example-contents">
<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>
<span class="comment">; Audio out Audio in</span>
-odac -iadc <span class="comment">;;;RT audio I/O</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o cpsxpch_pierce.wav -W ;;; for file output any platform</span>
<span class="csdtag"></CsOptions></span>
<span class="csdtag"><CsInstruments></span>
<span class="comment">; Initialize the global variables.</span>
<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">kr</span> <span class="op">=</span> 4410
<span class="ohdr">ksmps</span> <span class="op">=</span> 10
<span class="ohdr">nchnls</span> <span class="op">=</span> 1
<span class="comment">; Instrument #1.</span>
<span class="oblock">instr</span> 1
<span class="comment">; Use a Pierce scale centered on middle A.</span>
ipch <span class="op">=</span> 2.02
iequal <span class="op">=</span> 12
irepeat <span class="op">=</span> 3
ibase <span class="op">=</span> 261.62561
icps <span class="opc">cpsxpch</span> ipch, iequal, irepeat, ibase
<span class="opc">print</span> icps
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="comment">; Play Instrument #1 for one second.</span>
<span class="stamnt">i</span> 1 0 1
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
</div>
<p><br class="example-break" />
Its output should include lines like this:
</p>
<pre class="screen">instr 1: icps = 2827.762</pre>
<p>
</p>
</div>
<div class="refsect1" title="See Also">
<a id="idp17144904"></a>
<h2>See Also</h2>
<p>
<a class="link" href="cpspch.html" title="cpspch"><em class="citetitle">cpspch</em></a>,
<a class="link" href="cps2pch.html" title="cps2pch"><em class="citetitle">cps2pch</em></a>
</p>
</div>
<div class="refsect1" title="Credits">
<a id="idp17146464"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: John ffitch</td>
</tr>
<tr>
<td>University of Bath/Codemist Ltd.</td>
</tr>
<tr>
<td>Bath, UK</td>
</tr>
<tr>
<td>1997</td>
</tr>
</table>
<p>
</p>
<p>New in Csound version 3.492</p>
</div>
</div>
<div class="navfooter">
<hr />
<table width="100%" summary="Navigation footer">
<tr>
<td width="40%" align="left"><a accesskey="p" href="cpstuni.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="cpumeter.html">Next</a></td>
</tr>
<tr>
<td width="40%" align="left" valign="top">cpstuni </td>
<td width="20%" align="center">
<a accesskey="h" href="index.html">Home</a>
</td>
<td width="40%" align="right" valign="top"> cpumeter</td>
</tr>
</table>
</div>
</body>
</html>
distrib
>
Mageia
>
5
>
x86_64
>
media
>
core-release
>
by-pkgid
>
b707d9a4ee443103660a75ccb6e51334
>
files
>
472
