<?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>wguide1</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="wgpluck2.html" title="wgpluck2" /> <link rel="next" href="wguide2.html" title="wguide2" /> </head> <body> <div class="navheader"> <table width="100%" summary="Navigation header"> <tr> <th colspan="3" align="center">wguide1</th> </tr> <tr> <td width="20%" align="left"><a accesskey="p" href="wgpluck2.html">Prev</a> </td> <th width="60%" align="center">Orchestra Opcodes and Operators</th> <td width="20%" align="right"> <a accesskey="n" href="wguide2.html">Next</a></td> </tr> </table> <hr /> </div> <div class="refentry" title="wguide1"> <a id="wguide1"></a> <div class="titlepage"></div> <a id="IndexWguide1" class="indexterm"></a> <div class="refnamediv"> <h2> <span class="refentrytitle">wguide1</span> </h2> <p>wguide1 — A simple waveguide model consisting of one delay-line and one first-order lowpass filter. </p> </div> <div class="refsect1" title="Description"> <a id="idp53947784"></a> <h2>Description</h2> <p> A simple waveguide model consisting of one delay-line and one first-order lowpass filter. </p> </div> <div class="refsect1" title="Syntax"> <a id="idp53948600"></a> <h2>Syntax</h2> <pre class="synopsis">ares <span class="command"><strong>wguide1</strong></span> asig, xfreq, kcutoff, kfeedback</pre> </div> <div class="refsect1" title="Performance"> <a id="idp53959056"></a> <h2>Performance</h2> <p> <span class="emphasis"><em>asig</em></span> -- the input of excitation noise. </p> <p> <span class="emphasis"><em>xfreq</em></span> -- the frequency (i.e. the inverse of delay time) Changed to x-rate in Csound version 3.59. </p> <p> <span class="emphasis"><em>kcutoff</em></span> -- the filter cutoff frequency in Hz. </p> <p> <span class="emphasis"><em>kfeedback</em></span> -- the feedback factor. </p> <p> <span class="emphasis"><em>wguide1</em></span> is the most elemental waveguide model, consisting of one delay-line and one first-order lowpass filter. </p> <p> Implementing waveguide algorithms as opcodes, instead of orc instruments, allows the user to set <span class="emphasis"><em>kr</em></span> different than <span class="emphasis"><em>sr</em></span>, allowing better performance particulary when using real-time. </p> <p> </p> <div class="mediaobject"> <img src="images/wguide1.png" alt="wguide1." /> <div class="caption"> <p>wguide1.</p> </div> </div> <p> </p> </div> <div class="refsect1" title="Examples"> <a id="idp53998528"></a> <h2>Examples</h2> <p> Here is an example of the wguide1 opcode. It uses the file <a class="ulink" href="examples/wguide1.csd" target="_top"><em class="citetitle">wguide1.csd</em></a>. </p> <div class="example"> <a id="idp53999512"></a> <p class="title"> <strong>Example 996. Example of the wguide1 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 No messages</span> -odac -iadc -d <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 wguide1.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 - a simple noise waveform.</span> <span class="oblock">instr</span> 1 <span class="comment">; Generate some noise.</span> asig <span class="opc">noise</span> 20000, 0.5 <span class="opc">out</span> asig <span class="oblock">endin</span> <span class="comment">; Instrument #2 - a waveguide example.</span> <span class="oblock">instr</span> 2 <span class="comment">; Generate some noise.</span> asig <span class="opc">noise</span> 20000, 0.5 <span class="comment">; Run it through a wave-guide model.</span> kfreq <span class="opc">init</span> 200 kcutoff <span class="opc">init</span> 3000 kfeedback <span class="opc">init</span> 0.8 awg1 <span class="opc">wguide1</span> asig, kfreq, kcutoff, kfeedback <span class="opc">out</span> awg1 <span class="oblock">endin</span> <span class="csdtag"></CsInstruments></span> <span class="csdtag"><CsScore></span> <span class="comment">; Play Instrument #1 for 2 seconds.</span> <span class="stamnt">i</span> 1 0 2 <span class="comment">; Play Instrument #2 for 2 seconds.</span> <span class="stamnt">i</span> 2 2 2 <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="idp54001776"></a> <h2>See Also</h2> <p> <a class="link" href="wguide2.html" title="wguide2"><em class="citetitle">wguide2</em></a> </p> </div> <div class="refsect1" title="Credits"> <a id="idp54002824"></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>October 1998</td> </tr> </table> <p> </p> <p>Example written by Kevin Conder.</p> <p>New in Csound version 3.49</p> </div> </div> <div class="navfooter"> <hr /> <table width="100%" summary="Navigation footer"> <tr> <td width="40%" align="left"><a accesskey="p" href="wgpluck2.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="wguide2.html">Next</a></td> </tr> <tr> <td width="40%" align="left" valign="top">wgpluck2 </td> <td width="20%" align="center"> <a accesskey="h" href="index.html">Home</a> </td> <td width="40%" align="right" valign="top"> wguide2</td> </tr> </table> </div> </body> </html>