<?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>vdelay</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="vcopy_i.html" title="vcopy_i" /> <link rel="next" href="vdelay3.html" title="vdelay3" /> </head> <body> <div class="navheader"> <table width="100%" summary="Navigation header"> <tr> <th colspan="3" align="center">vdelay</th> </tr> <tr> <td width="20%" align="left"><a accesskey="p" href="vcopy_i.html">Prev</a> </td> <th width="60%" align="center">Orchestra Opcodes and Operators</th> <td width="20%" align="right"> <a accesskey="n" href="vdelay3.html">Next</a></td> </tr> </table> <hr /> </div> <div class="refentry" title="vdelay"> <a id="vdelay"></a> <div class="titlepage"></div> <a id="IndexVdelay" class="indexterm"></a> <div class="refnamediv"> <h2> <span class="refentrytitle">vdelay</span> </h2> <p>vdelay — An interpolating variable time delay. </p> </div> <div class="refsect1" title="Description"> <a id="idp51226672"></a> <h2>Description</h2> <p> This is an interpolating variable time delay, it is not very different from the existing implementation (<a class="link" href="deltapi.html" title="deltapi"><em class="citetitle">deltapi</em></a>), it is only easier to use. </p> </div> <div class="refsect1" title="Syntax"> <a id="idp51227864"></a> <h2>Syntax</h2> <pre class="synopsis">ares <span class="command"><strong>vdelay</strong></span> asig, adel, imaxdel [, iskip]</pre> </div> <div class="refsect1" title="Initialization"> <a id="idp51279048"></a> <h2>Initialization</h2> <p> <span class="emphasis"><em>imaxdel</em></span> -- Maximum value of delay in milliseconds. If <span class="emphasis"><em>adel</em></span> gains a value greater than <span class="emphasis"><em>imaxdel</em></span> it is folded around <span class="emphasis"><em>imaxdel</em></span>. This should not happen. </p> <p> <span class="emphasis"><em>iskip</em></span> -- Skip initialization if present and nonzero </p> </div> <div class="refsect1" title="Performance"> <a id="idp51281048"></a> <h2>Performance</h2> <p> With this unit generator it is possible to do Doppler effects or chorusing and flanging. </p> <p> <span class="emphasis"><em>asig</em></span> -- Input signal. </p> <p> <span class="emphasis"><em>adel</em></span> -- Current value of delay in milliseconds. Note that linear functions have no pitch change effects. Fast changing values of <span class="emphasis"><em>adel</em></span> will cause discontinuities in the waveform resulting noise. </p> </div> <div class="refsect1" title="Examples"> <a id="idp51283136"></a> <h2>Examples</h2> <p> Here is an example of the vdelay opcode. It uses the file <a class="ulink" href="examples/vdelay.csd" target="_top"><em class="citetitle">vdelay.csd</em></a>. </p> <div class="example"> <a id="idp51284080"></a> <p class="title"> <strong>Example 935. Example of the vdelay 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 realtime audio input is needed too</span> <span class="comment">; For Non-realtime ouput leave only the line below:</span> <span class="comment">; -o vdelay.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="oblock">instr</span> 1 ims <span class="op">=</span> 100 <span class="comment">;maximum delay time in msec</span> aout <span class="opc">poscil</span> .8, 220, 1 <span class="comment">;make a signal</span> a2 <span class="opc">poscil3</span> ims<span class="op">/</span>2, 1<span class="op">/</span>p3, 1 <span class="comment">;make an LFO</span> a2 <span class="op">=</span> a2 <span class="op">+</span> ims<span class="op">/</span>2 <span class="comment">;offset the LFO so that it is positive</span> asig <span class="opc">vdelay</span> aout, a2, ims <span class="comment">;use the LFO to control delay time</span> <span class="opc">outs</span> asig, asig <span class="oblock">endin</span> <span class="csdtag"></CsInstruments></span> <span class="csdtag"><CsScore></span> <span class="stamnt">f</span>1 0 8192 10 1 <span class="comment">;sine wave</span> <span class="stamnt">i</span> 1 0 5 <span class="stamnt">e</span> <span class="csdtag"></CsScore></span> <span class="csdtag"></CsoundSynthesizer></span> </pre> </div> </div> <p><br class="example-break" /> Two important points here. First, the delay time must be always positive. And second, even though the delay time can be controlled in k-rate, it is not advised to do so, since sudden time changes will create clicks. </p> </div> <div class="refsect1" title="See Also"> <a id="idp51286704"></a> <h2>See Also</h2> <p> <a class="link" href="vdelay3.html" title="vdelay3"><em class="citetitle">vdelay3</em></a> </p> </div> <div class="refsect1" title="Credits"> <a id="idp51287720"></a> <h2>Credits</h2> <p> </p> <table border="0" summary="Simple list" class="simplelist"> <tr> <td>Author: Paris Smaragdis</td> </tr> <tr> <td>MIT, Cambridge</td> </tr> <tr> <td>1995</td> </tr> </table> <p> </p> </div> </div> <div class="navfooter"> <hr /> <table width="100%" summary="Navigation footer"> <tr> <td width="40%" align="left"><a accesskey="p" href="vcopy_i.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="vdelay3.html">Next</a></td> </tr> <tr> <td width="40%" align="left" valign="top">vcopy_i </td> <td width="20%" align="center"> <a accesskey="h" href="index.html">Home</a> </td> <td width="40%" align="right" valign="top"> vdelay3</td> </tr> </table> </div> </body> </html>