<?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>zkmod</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="zkcl.html" title="zkcl" /> <link rel="next" href="zkr.html" title="zkr" /> </head> <body> <div class="navheader"> <table width="100%" summary="Navigation header"> <tr> <th colspan="3" align="center">zkmod</th> </tr> <tr> <td width="20%" align="left"><a accesskey="p" href="zkcl.html">Prev</a> </td> <th width="60%" align="center">Orchestra Opcodes and Operators</th> <td width="20%" align="right"> <a accesskey="n" href="zkr.html">Next</a></td> </tr> </table> <hr /> </div> <div class="refentry" title="zkmod"> <a id="zkmod"></a> <div class="titlepage"></div> <a id="IndexZkmod" class="indexterm"></a> <div class="refnamediv"> <h2> <span class="refentrytitle">zkmod</span> </h2> <p>zkmod — Facilitates the modulation of one signal by another. </p> </div> <div class="refsect1" title="Description"> <a id="idp54911992"></a> <h2>Description</h2> <p> Facilitates the modulation of one signal by another. </p> </div> <div class="refsect1" title="Syntax"> <a id="idp54912736"></a> <h2>Syntax</h2> <pre class="synopsis">kres <span class="command"><strong>zkmod</strong></span> ksig, kzkmod</pre> </div> <div class="refsect1" title="Performance"> <a id="idp54923192"></a> <h2>Performance</h2> <p> <span class="emphasis"><em>ksig</em></span> -- the input signal </p> <p> <span class="emphasis"><em>kzkmod</em></span> -- controls which zk variable is used for modulation. A positive value means additive modulation, a negative value means multiplicative modulation. A value of 0 means no change to <span class="emphasis"><em>ksig</em></span>. <span class="emphasis"><em>kzkmod</em></span> can be i-rate or k-rate </p> <p> <span class="emphasis"><em>zkmod</em></span> facilitates the modulation of one signal by another, where the modulating signal comes from a zk variable. Either additive or mulitiplicative modulation can be specified. </p> </div> <div class="refsect1" title="Examples"> <a id="idp54925928"></a> <h2>Examples</h2> <p> Here is an example of the zkmod opcode. It uses the file <a class="ulink" href="examples/zkmod.csd" target="_top"><em class="citetitle">zkmod.csd</em></a>. </p> <div class="example"> <a id="idp54926904"></a> <p class="title"> <strong>Example 1019. Example of the zkmod 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 zkmod.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> 2 <span class="comment">; Initialize the ZAK space.</span> <span class="comment">; Create 2 a-rate variables and 2 k-rate variables.</span> <span class="opc">zakinit</span> 2, 2 <span class="comment">; Instrument #1 -- a signal with jitter.</span> <span class="oblock">instr</span> 1 <span class="comment">; Generate a k-rate signal goes from 30 to 2,000.</span> kline <span class="opc">line</span> 30, p3, 2000 <span class="comment">; Add the signal into zk variable #1.</span> <span class="opc">zkw</span> kline, 1 <span class="oblock">endin</span> <span class="comment">; Instrument #2 -- generates audio output.</span> <span class="oblock">instr</span> 2 <span class="comment">; Create a k-rate signal modulated the jitter opcode.</span> kamp <span class="opc">init</span> 20 kcpsmin <span class="opc">init</span> 40 kcpsmax <span class="opc">init</span> 60 kjtr <span class="opc">jitter</span> kamp, kcpsmin, kcpsmax <span class="comment">; Get the frequency values from zk variable #1.</span> kfreq <span class="opc">zkr</span> 1 <span class="comment">; Add the the frequency values in zk variable #1 to </span> <span class="comment">; the jitter signal.</span> kjfreq <span class="opc">zkmod</span> kjtr, 1 <span class="comment">; Use a simple sine waveform for the left speaker.</span> aleft <span class="opc">oscil</span> 20000, kfreq, 1 <span class="comment">; Use a sine waveform with jitter for the right speaker.</span> aright <span class="opc">oscil</span> 20000, kjfreq, 1 <span class="comment">; Generate the audio output.</span> <span class="opc">outs</span> aleft, aright <span class="comment">; Clear the zk variables, prepare them for </span> <span class="comment">; another pass.</span> <span class="opc">zkcl</span> 0, 2 <span class="oblock">endin</span> <span class="csdtag"></CsInstruments></span> <span class="csdtag"><CsScore></span> <span class="comment">; Table #1, a sine wave.</span> <span class="stamnt">f</span> 1 0 16384 10 1 <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 0 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="idp54963256"></a> <h2>See Also</h2> <p> <a class="link" href="zamod.html" title="zamod"><em class="citetitle">zamod</em></a>, <a class="link" href="zkcl.html" title="zkcl"><em class="citetitle">zkcl</em></a>, <a class="link" href="zkr.html" title="zkr"><em class="citetitle">zkr</em></a>, <a class="link" href="zkwm.html" title="zkwm"><em class="citetitle">zkwm</em></a>, <a class="link" href="zkw.html" title="zkw"><em class="citetitle">zkw</em></a> </p> </div> <div class="refsect1" title="Credits"> <a id="idp54966192"></a> <h2>Credits</h2> <p> </p> <table border="0" summary="Simple list" class="simplelist"> <tr> <td>Author: Robin Whittle</td> </tr> <tr> <td>Australia</td> </tr> <tr> <td>May 1997</td> </tr> </table> <p> </p> <p>New in version 3.45</p> <p>Example written by Kevin Conder.</p> </div> </div> <div class="navfooter"> <hr /> <table width="100%" summary="Navigation footer"> <tr> <td width="40%" align="left"><a accesskey="p" href="zkcl.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="zkr.html">Next</a></td> </tr> <tr> <td width="40%" align="left" valign="top">zkcl </td> <td width="20%" align="center"> <a accesskey="h" href="index.html">Home</a> </td> <td width="40%" align="right" valign="top"> zkr</td> </tr> </table> </div> </body> </html>