<?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>poscil</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="poscil3.html" title="poscil3" /> <link rel="next" href="pow.html" title="pow" /> </head> <body> <div class="navheader"> <table width="100%" summary="Navigation header"> <tr> <th colspan="3" align="center">poscil</th> </tr> <tr> <td width="20%" align="left"><a accesskey="p" href="poscil3.html">Prev</a> </td> <th width="60%" align="center">Orchestra Opcodes and Operators</th> <td width="20%" align="right"> <a accesskey="n" href="pow.html">Next</a></td> </tr> </table> <hr /> </div> <div class="refentry" title="poscil"> <a id="poscil"></a> <div class="titlepage"></div> <a id="Indexposcil" class="indexterm"></a> <div class="refnamediv"> <h2> <span class="refentrytitle">poscil</span> </h2> <p>poscil — High precision oscillator. </p> </div> <div class="refsect1" title="Description"> <a id="idp36882984"></a> <h2>Description</h2> <p> High precision oscillator. </p> </div> <div class="refsect1" title="Syntax"> <a id="idp36931864"></a> <h2>Syntax</h2> <pre class="synopsis">ares <span class="command"><strong>poscil</strong></span> aamp, acps, ifn [, iphs]</pre> <pre class="synopsis">ares <span class="command"><strong>poscil</strong></span> aamp, kcps, ifn [, iphs]</pre> <pre class="synopsis">ares <span class="command"><strong>poscil</strong></span> kamp, acps, ifn [, iphs]</pre> <pre class="synopsis">ares <span class="command"><strong>poscil</strong></span> kamp, kcps, ifn [, iphs]</pre> <pre class="synopsis">ires <span class="command"><strong>poscil</strong></span> kamp, kcps, ifn [, iphs]</pre> <pre class="synopsis">kres <span class="command"><strong>poscil</strong></span> kamp, kcps, ifn [, iphs]</pre> </div> <div class="refsect1" title="Initialization"> <a id="idp36936688"></a> <h2>Initialization</h2> <p> <span class="emphasis"><em>ifn</em></span> -- function table number </p> <p> <span class="emphasis"><em>iphs</em></span> (optional, default=0) -- initial phase (normalized table index 0-1) </p> </div> <div class="refsect1" title="Performance"> <a id="idp36938136"></a> <h2>Performance</h2> <p> <span class="emphasis"><em>ares</em></span> -- output signal </p> <p> <span class="emphasis"><em>kamp</em></span>, <span class="emphasis"><em>aamp</em></span> -- the amplitude of the output signal. </p> <p> <span class="emphasis"><em>kcps</em></span>, <span class="emphasis"><em>acps</em></span> -- the frequency of the output signal in cycles per second. </p> <p> <span class="emphasis"><em>poscil</em></span> (precise oscillator) is the same as <a class="link" href="oscili.html" title="oscili"><em class="citetitle">oscili</em></a>, but allows much more precise frequency control, especially when using long tables and low frequency values. It uses floating-point table indexing, instead of integer math, like <span class="emphasis"><em>oscil</em></span> and <span class="emphasis"><em>oscili</em></span>. It is only a bit slower than <span class="emphasis"><em>oscili</em></span>. </p> <p> Since Csound 4.22, <span class="emphasis"><em>poscil</em></span> can accept also negative frequency values and use a-rate values both for amplitude and frequency. So both AM and FM are allowed using this opcode. </p> <p>The opcode <a class="link" href="poscil3.html" title="poscil3"><em class="citetitle">poscil3</em></a> is the same as <span class="emphasis"><em>poscil</em></span>, but uses cubic interpolation.</p> <p>Note that <span class="emphasis"><em>poscil</em></span> can use deffered (non-power of two) length tables.</p> </div> <div class="refsect1" title="Examples"> <a id="idp36944416"></a> <h2>Examples</h2> <p> Here is an example of the poscil opcode. It uses the file <a class="ulink" href="examples/poscil.csd" target="_top"><em class="citetitle">poscil.csd</em></a>. </p> <div class="example"> <a id="idp36945392"></a> <p class="title"> <strong>Example 608. Example of the poscil 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> -odac <span class="comment">;;;realtime audio out</span> <span class="comment">;-iadc ;;;uncomment -iadc if RT audio input is needed too</span> <span class="comment">; For Non-realtime ouput leave only the line below:</span> <span class="comment">; -o poscil.wav -W ;;; for file output any platform</span> <span class="csdtag"></CsOptions></span> <span class="csdtag"><CsInstruments></span> <span class="ohdr">sr</span> <span class="op">=</span> 44100 <span class="ohdr">ksmps</span> <span class="op">=</span> 32 <span class="ohdr">nchnls</span> <span class="op">=</span> 2 <span class="ohdr">0dbfs</span> <span class="op">=</span> 1 <span class="ohdr">seed</span> 0 gisine <span class="ohdr">ftgen</span> 0, 0, 2^10, 10, 1 <span class="oblock">instr</span> 1 ipeak <span class="opc">random</span> 0, 1 <span class="comment">;where is the envelope peak</span> asig <span class="opc">poscil</span> .8, 220, gisine aenv <span class="opc">transeg</span> 0, p3<span class="op">*</span>ipeak, 6, 1, p3<span class="op">-</span>p3<span class="op">*</span>ipeak, <span class="op">-</span>6, 0 aL,aR <span class="opc">pan2</span> asig<span class="op">*</span>aenv, ipeak <span class="comment">;pan according to random value</span> <span class="opc">outs</span> aL, aR <span class="oblock">endin</span> <span class="csdtag"></CsInstruments></span> <span class="csdtag"><CsScore></span> <span class="stamnt">i</span>1 0 5 <span class="stamnt">i</span>1 4 5 <span class="stamnt">i</span>1 8 5 <span class="stamnt">e</span> <span class="csdtag"></CsScore></span> <span class="csdtag"></CsoundSynthesizer></span> </pre> </div> </div> <p><br class="example-break" /> </p> </div> <div class="refsect1" title="See Also"> <a id="idp36947664"></a> <h2>See Also</h2> <p> <a class="link" href="poscil3.html" title="poscil3"><em class="citetitle">poscil3</em></a> </p> </div> <div class="refsect1" title="Credits"> <a id="idp36948712"></a> <h2>Credits</h2> <p> </p> <table border="0" summary="Simple list" class="simplelist"> <tr> <td>Author: Gabriel Maldonado</td> </tr> <tr> <td>Italy</td> </tr> <tr> <td>1998</td> </tr> </table> <p> </p> <p>November 2002. Added a note about the changes to Csound version 4.22, thanks to Rasmus Ekman.</p> <p>New in Csound version 3.52</p> </div> </div> <div class="navfooter"> <hr /> <table width="100%" summary="Navigation footer"> <tr> <td width="40%" align="left"><a accesskey="p" href="poscil3.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="pow.html">Next</a></td> </tr> <tr> <td width="40%" align="left" valign="top">poscil3 </td> <td width="20%" align="center"> <a accesskey="h" href="index.html">Home</a> </td> <td width="40%" align="right" valign="top"> pow</td> </tr> </table> </div> </body> </html>