<?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>expsega</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="expseg.html" title="expseg" /> <link rel="next" href="expsegb.html" title="expsegb" /> </head> <body> <div class="navheader"> <table width="100%" summary="Navigation header"> <tr> <th colspan="3" align="center">expsega</th> </tr> <tr> <td width="20%" align="left"><a accesskey="p" href="expseg.html">Prev</a> </td> <th width="60%" align="center">Orchestra Opcodes and Operators</th> <td width="20%" align="right"> <a accesskey="n" href="expsegb.html">Next</a></td> </tr> </table> <hr /> </div> <div class="refentry"> <a id="expsega"></a> <div class="titlepage"></div> <a id="IndexExpsega" class="indexterm"></a> <div class="refnamediv"> <h2> <span class="refentrytitle">expsega</span> </h2> <p>expsega — An exponential segment generator operating at a-rate. </p> </div> <div class="refsect1"> <a id="idm281472938734856"></a> <h2>Description</h2> <p> An exponential segment generator operating at a-rate. This unit is almost identical to <a class="link" href="expseg.html" title="expseg"><em class="citetitle">expseg</em></a>, but more precise when defining segments with very short durations (i.e., in a percussive attack phase) at audio rate. </p> </div> <div class="refsect1"> <a id="idm281472938664792"></a> <h2>Syntax</h2> <pre class="synopsis">ares <span class="command"><strong>expsega</strong></span> ia, idur1, ib [, idur2] [, ic] [...]</pre> </div> <div class="refsect1"> <a id="idm281472938662536"></a> <h2>Initialization</h2> <p> <span class="emphasis"><em>ia</em></span> -- starting value. Zero is illegal. </p> <p> <span class="emphasis"><em>ib</em></span>, <span class="emphasis"><em>ic</em></span>, etc. -- value after <span class="emphasis"><em>idur1</em></span> seconds, etc. must be non-zero and must agree in sign with <span class="emphasis"><em>ia</em></span>. </p> <p> <span class="emphasis"><em>idur1</em></span> -- duration in seconds of first segment. A zero or negative value will cause all initialization to be skipped. </p> <p> <span class="emphasis"><em>idur2</em></span>, <span class="emphasis"><em>idur3</em></span>, etc. -- duration in seconds of subsequent segments. A zero or negative value will terminate the initialization process with the preceding point, permitting the last defined line or curve to be continued indefinitely in performance. The default is zero. </p> </div> <div class="refsect1"> <a id="idm281472938655880"></a> <h2>Performance</h2> <p> This unit generate audio signals whose values can pass through two or more specified points. The sum of <span class="emphasis"><em>dur</em></span> values may or may not equal the instrument's performance time. A shorter performance will truncate the specified pattern, while a longer one will cause the last defined segment to continue on in the same direction. </p> </div> <div class="refsect1"> <a id="idm281472938653688"></a> <h2>Examples</h2> <p> Here is an example of the expsega opcode. It uses the file <a class="ulink" href="examples/expsega.csd" target="_top"><em class="citetitle">expsega.csd</em></a>. </p> <div class="example"> <a id="idm281472938651832"></a> <p class="title"> <strong>Example 258. Example of the expsega 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="idm281472770728200"></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 No messages</span> -odac -iadc -d <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 expsega.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">; Define a short percussive amplitude envelope that</span> <span class="c1">; goes from 0.01 to 20,000 and back.</span> a<span class="n">env</span> <span class="nb">expsega</span> <span class="mf">0.01</span><span class="p">,</span> <span class="mf">0.1</span><span class="p">,</span> <span class="mi">20000</span><span class="p">,</span> <span class="mf">0.1</span><span class="p">,</span> <span class="mf">0.01</span> a<span class="n">1</span> <span class="nb">oscil</span> a<span class="n">env</span><span class="p">,</span> <span class="mi">440</span><span class="p">,</span> <span class="mi">1</span> <span class="nb">out</span> a<span class="n">1</span> <span class="kd">endin</span> <span class="nt"></CsInstruments></span> <span class="nt"><CsScore></span> <span class="c1">; Table #1, a sine wave.</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">; 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="c1">; Play Instrument #1 for one second.</span> <span class="nb">i</span> <span class="mi">1</span> <span class="mi">1</span> <span class="mi">1</span> <span class="c1">; Play Instrument #1 for one second.</span> <span class="nb">i</span> <span class="mi">1</span> <span class="mi">2</span> <span class="mi">1</span> <span class="c1">; Play Instrument #1 for one second.</span> <span class="nb">i</span> <span class="mi">1</span> <span class="mi">3</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" /> </p> </div> <div class="refsect1"> <a id="idm281472938647608"></a> <h2>See Also</h2> <p> <a class="link" href="expseg.html" title="expseg"><em class="citetitle">expseg</em></a>, <a class="link" href="expsegr.html" title="expsegr"><em class="citetitle">expsegr</em></a> </p> </div> <div class="refsect1"> <a id="idm281472938644536"></a> <h2>Credits</h2> <p>Author: Gabriel Maldonado</p> <p>Example written by Kevin Conder.</p> <p>New in Csound 3.57</p> </div> </div> <div class="navfooter"> <hr /> <table width="100%" summary="Navigation footer"> <tr> <td width="40%" align="left"><a accesskey="p" href="expseg.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="expsegb.html">Next</a></td> </tr> <tr> <td width="40%" align="left" valign="top">expseg </td> <td width="20%" align="center"> <a accesskey="h" href="index.html">Home</a> </td> <td width="40%" align="right" valign="top"> expsegb</td> </tr> </table> </div> </body> </html>