<?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" /> <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="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"> <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"> <a id="idm281472944111336"></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"> <a id="idm281472944109768"></a> <h2>Syntax</h2> <pre class="synopsis">icps <span class="command"><strong>cpsxpch</strong></span> ipch, iequal, irepeat, ibase</pre> </div> <div class="refsect1"> <a id="idm281472944107512"></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" 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"> <a id="idm281472944092216"></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="idm281472944090440"></a> <p class="title"> <strong>Example 167. 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> <div class="refsect1"> <a id="idm281472777097400"></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> <span class="c1">; Audio out Audio in</span> -odac -iadc <span class="c1">;;;RT audio I/O</span> <span class="c1">; For Non-realtime ouput leave only the line below:</span> <span class="c1">; -o cpsxpch.wav -W ;;; for file output any platform</span> <span class="nt"></CsOptions></span> <span class="nt"><CsInstruments></span> <span class="c1">; Initialize the global variables.</span> <span class="vg">sr</span> <span class="o">=</span> <span class="mi">44100</span> <span class="vg">kr</span> <span class="o">=</span> <span class="mi">4410</span> <span class="vg">ksmps</span> <span class="o">=</span> <span class="mi">10</span> <span class="vg">nchnls</span> <span class="o">=</span> <span class="mi">1</span> <span class="c1">; Instrument #1.</span> <span class="kd">instr</span> <span class="nf">1</span> <span class="c1">; Use a normal twelve-tone scale.</span> i<span class="n">pch</span> <span class="o">=</span> <span class="mf">8.02</span> i<span class="n">equal</span> <span class="o">=</span> <span class="mi">12</span> i<span class="n">repeat</span> <span class="o">=</span> <span class="mi">2</span> i<span class="n">base</span> <span class="o">=</span> <span class="mf">1.02197503906</span> i<span class="n">cps</span> <span class="nb">cpsxpch</span> i<span class="n">pch</span><span class="p">,</span> i<span class="n">equal</span><span class="p">,</span> i<span class="n">repeat</span><span class="p">,</span> i<span class="n">base</span> <span class="nb">print</span> i<span class="n">cps</span> <span class="kd">endin</span> <span class="nt"></CsInstruments></span> <span class="nt"><CsScore></span> <span class="c1">; Play Instrument #1 for one second.</span> <span class="nb">i</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mi">1</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" /> 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="idm281472944084360"></a> <p class="title"> <strong>Example 168. Example of the cpsxpch opcode using a 10.5 ET scale.</strong> </p> <div class="example-contents"> <div class="refsect1"> <a id="idm281472777090232"></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> <span class="c1">; Audio out Audio in</span> -odac -iadc <span class="c1">;;;RT audio I/O</span> <span class="c1">; For Non-realtime ouput leave only the line below:</span> <span class="c1">; -o cpsxpch_105et.wav -W ;;; for file output any platform</span> <span class="nt"></CsOptions></span> <span class="nt"><CsInstruments></span> <span class="c1">; Initialize the global variables.</span> <span class="vg">sr</span> <span class="o">=</span> <span class="mi">44100</span> <span class="vg">kr</span> <span class="o">=</span> <span class="mi">4410</span> <span class="vg">ksmps</span> <span class="o">=</span> <span class="mi">10</span> <span class="vg">nchnls</span> <span class="o">=</span> <span class="mi">1</span> <span class="c1">; Instrument #1.</span> <span class="kd">instr</span> <span class="nf">1</span> <span class="c1">; Use a 10.5ET scale.</span> i<span class="n">pch</span> <span class="o">=</span> <span class="mf">4.02</span> i<span class="n">equal</span> <span class="o">=</span> <span class="mi">21</span> i<span class="n">repeat</span> <span class="o">=</span> <span class="mi">4</span> i<span class="n">base</span> <span class="o">=</span> <span class="mf">16.35160062496</span> i<span class="n">cps</span> <span class="nb">cpsxpch</span> i<span class="n">pch</span><span class="p">,</span> i<span class="n">equal</span><span class="p">,</span> i<span class="n">repeat</span><span class="p">,</span> i<span class="n">base</span> <span class="nb">print</span> i<span class="n">cps</span> <span class="kd">endin</span> <span class="nt"></CsInstruments></span> <span class="nt"><CsScore></span> <span class="c1">; Play Instrument #1 for one second.</span> <span class="nb">i</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mi">1</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" /> 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="idm281472944080520"></a> <p class="title"> <strong>Example 169. Example of the cpsxpch opcode using a Pierce scale centered on middle A.</strong> </p> <div class="example-contents"> <div class="refsect1"> <a id="idm281472777045128"></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> <span class="c1">; Audio out Audio in</span> -odac -iadc <span class="c1">;;;RT audio I/O</span> <span class="c1">; For Non-realtime ouput leave only the line below:</span> <span class="c1">; -o cpsxpch_pierce.wav -W ;;; for file output any platform</span> <span class="nt"></CsOptions></span> <span class="nt"><CsInstruments></span> <span class="c1">; Initialize the global variables.</span> <span class="vg">sr</span> <span class="o">=</span> <span class="mi">44100</span> <span class="vg">kr</span> <span class="o">=</span> <span class="mi">4410</span> <span class="vg">ksmps</span> <span class="o">=</span> <span class="mi">10</span> <span class="vg">nchnls</span> <span class="o">=</span> <span class="mi">1</span> <span class="c1">; Instrument #1.</span> <span class="kd">instr</span> <span class="nf">1</span> <span class="c1">; Use a Pierce scale centered on middle A.</span> i<span class="n">pch</span> <span class="o">=</span> <span class="mf">2.02</span> i<span class="n">equal</span> <span class="o">=</span> <span class="mi">12</span> i<span class="n">repeat</span> <span class="o">=</span> <span class="mi">3</span> i<span class="n">base</span> <span class="o">=</span> <span class="mf">261.62561</span> i<span class="n">cps</span> <span class="nb">cpsxpch</span> i<span class="n">pch</span><span class="p">,</span> i<span class="n">equal</span><span class="p">,</span> i<span class="n">repeat</span><span class="p">,</span> i<span class="n">base</span> <span class="nb">print</span> i<span class="n">cps</span> <span class="kd">endin</span> <span class="nt"></CsInstruments></span> <span class="nt"><CsScore></span> <span class="c1">; Play Instrument #1 for one second.</span> <span class="nb">i</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mi">1</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" /> Its output should include lines like this: </p> <pre class="screen">instr 1: icps = 2827.762</pre> <p> </p> </div> <div class="refsect1"> <a id="idm281472944077864"></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"> <a id="idm281472944074760"></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>