<?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>oscil</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="oscil3.html" title="oscil3" /> <link rel="next" href="oscili.html" title="oscili" /> </head> <body> <div class="navheader"> <table width="100%" summary="Navigation header"> <tr> <th colspan="3" align="center">oscil</th> </tr> <tr> <td width="20%" align="left"><a accesskey="p" href="oscil3.html">Prev</a> </td> <th width="60%" align="center">Orchestra Opcodes and Operators</th> <td width="20%" align="right"> <a accesskey="n" href="oscili.html">Next</a></td> </tr> </table> <hr /> </div> <div class="refentry"> <a id="oscil"></a> <div class="titlepage"></div> <a id="IndexOscil" class="indexterm"></a> <div class="refnamediv"> <h2> <span class="refentrytitle">oscil</span> </h2> <p>oscil — A simple oscillator. </p> </div> <div class="refsect1"> <a id="idm281472909053000"></a> <h2>Description</h2> <p> <span class="emphasis"><em>oscil</em></span> reads table <span class="emphasis"><em>ifn</em></span> sequentially and repeatedly at a frequency <span class="emphasis"><em>xcps</em></span>. The amplitude is scaled by <span class="emphasis"><em>xamp</em></span>. </p> </div> <div class="refsect1"> <a id="idm281472908984488"></a> <h2>Syntax</h2> <pre class="synopsis">ares <span class="command"><strong>oscil</strong></span> xamp, xcps [, ifn, iphs]</pre> <pre class="synopsis">kres <span class="command"><strong>oscil</strong></span> kamp, kcps [, ifn, iphs]</pre> </div> <div class="refsect1"> <a id="idm281472908980840"></a> <h2>Initialization</h2> <p> <span class="emphasis"><em>ifn</em></span> -- (optional) function table number. Requires a wrap-around guard point. The table number defaults to -1 which indicates a sinewave. </p> <p> <span class="emphasis"><em>iphs</em></span> (optional, default=0) -- initial phase of sampling, expressed as a fraction of a cycle (0 to 1). A negative value will cause phase initialization to be skipped. The default value is 0. </p> </div> <div class="refsect1"> <a id="idm281472908978104"></a> <h2>Performance</h2> <p> <span class="emphasis"><em>kamp, xamp</em></span> -- amplitude </p> <p> <span class="emphasis"><em>kcps, xcps</em></span> -- frequency in cycles per second. </p> <p> The <span class="emphasis"><em>oscil</em></span> opcode generates periodic control (or audio) signals consisting of the value of <span class="emphasis"><em>kamp</em></span> (<span class="emphasis"><em>xamp</em></span>) times the value returned from control rate (audio rate) sampling of a stored function table. The internal phase is simultaneously advanced in accordance with the <span class="emphasis"><em>kcps</em></span> or <span class="emphasis"><em>xcps</em></span> input value. </p> <p> Table <span class="emphasis"><em>ifn</em></span> is incrementally sampled modulo the table length and the value obtained is multiplied by <span class="emphasis"><em>amp</em></span>. </p> <p> If you need to change the oscillator table with a k-rate signal, you can use <a class="link" href="oscilikt.html" title="oscilikt"><em class="citetitle">oscilikt</em></a>. </p> </div> <div class="refsect1"> <a id="idm281472908970104"></a> <h2>Examples</h2> <p> Here is an example of the oscil opcode. It uses the file <a class="ulink" href="examples/oscil.csd" target="_top"><em class="citetitle">oscil.csd</em></a>. </p> <div class="example"> <a id="idm281472908968328"></a> <p class="title"> <strong>Example 623. Example of the oscil 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="idm281472732703208"></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 oscil.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">amp</span> <span class="o">=</span> <span class="mf">.6</span> k<span class="n">cps</span> <span class="o">=</span> <span class="mi">440</span> i<span class="n">fn</span> <span class="o">=</span> <span class="nb">p4</span> a<span class="n">sig</span> <span class="nb">oscil</span> k<span class="n">amp</span><span class="p">,</span> k<span class="n">cps</span><span class="p">,</span> i<span class="n">fn</span> <span class="nb">outs</span> a<span class="n">sig</span><span class="p">,</span>a<span class="n">sig</span> <span class="kd">endin</span> <span class="nt"></CsInstruments></span> <span class="nt"><CsScore></span> <span class="nb">f</span><span class="mi">1</span> <span class="mi">0</span> <span class="mi">16384</span> <span class="mi">10</span> <span class="mi">1</span> <span class="c1">; Sine</span> <span class="nb">f</span><span class="mi">2</span> <span class="mi">0</span> <span class="mi">16384</span> <span class="mi">10</span> <span class="mi">1</span> <span class="mf">0.5</span> <span class="mf">0.3</span> <span class="mf">0.25</span> <span class="mf">0.2</span> <span class="mf">0.167</span> <span class="mf">0.14</span> <span class="mf">0.125</span> <span class="mf">.111</span> <span class="c1">; Sawtooth</span> <span class="nb">f</span><span class="mi">3</span> <span class="mi">0</span> <span class="mi">16384</span> <span class="mi">10</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mf">0.3</span> <span class="mi">0</span> <span class="mf">0.2</span> <span class="mi">0</span> <span class="mf">0.14</span> <span class="mi">0</span> <span class="mf">.111</span> <span class="c1">; Square</span> <span class="nb">f</span><span class="mi">4</span> <span class="mi">0</span> <span class="mi">16384</span> <span class="mi">10</span> <span class="mi">1</span> <span class="mi">1</span> <span class="mi">1</span> <span class="mi">1</span> <span class="mf">0.7</span> <span class="mf">0.5</span> <span class="mf">0.3</span> <span class="mf">0.1</span> <span class="c1">; Pulse</span> <span class="nb">i</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mi">2</span> <span class="mi">1</span> <span class="nb">i</span> <span class="mi">1</span> <span class="mi">3</span> <span class="mi">2</span> <span class="mi">2</span> <span class="nb">i</span> <span class="mi">1</span> <span class="mi">6</span> <span class="mi">2</span> <span class="mi">3</span> <span class="nb">i</span> <span class="mi">1</span> <span class="mi">9</span> <span class="mi">2</span> <span class="mi">4</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="idm281472908964040"></a> <h2>See Also</h2> <p> <a class="link" href="oscili.html" title="oscili"><em class="citetitle">oscili</em></a>, <a class="link" href="oscilikt.html" title="oscilikt"><em class="citetitle">oscilikt</em></a>, <a class="link" href="oscil3.html" title="oscil3"><em class="citetitle">oscil3</em></a>, <a class="link" href="poscil.html" title="poscil"><em class="citetitle">poscil</em></a>, <a class="link" href="poscil3.html" title="poscil3"><em class="citetitle">poscil3</em></a> </p> </div> </div> <div class="navfooter"> <hr /> <table width="100%" summary="Navigation footer"> <tr> <td width="40%" align="left"><a accesskey="p" href="oscil3.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="oscili.html">Next</a></td> </tr> <tr> <td width="40%" align="left" valign="top">oscil3 </td> <td width="20%" align="center"> <a accesskey="h" href="index.html">Home</a> </td> <td width="40%" align="right" valign="top"> oscili</td> </tr> </table> </div> </body> </html>