<?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>moogvcf2</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="moogvcf.html" title="moogvcf" />
<link rel="next" href="moscil.html" title="moscil" />
</head>
<body>
<div class="navheader">
<table width="100%" summary="Navigation header">
<tr>
<th colspan="3" align="center">moogvcf2</th>
</tr>
<tr>
<td width="20%" align="left"><a accesskey="p" href="moogvcf.html">Prev</a> </td>
<th width="60%" align="center">Orchestra Opcodes and Operators</th>
<td width="20%" align="right"> <a accesskey="n" href="moscil.html">Next</a></td>
</tr>
</table>
<hr />
</div>
<div class="refentry" title="moogvcf2">
<a id="moogvcf2"></a>
<div class="titlepage"></div>
<a id="IndexMoogvcf2" class="indexterm"></a>
<div class="refnamediv">
<h2>
<span class="refentrytitle">moogvcf2</span>
</h2>
<p>moogvcf2 —
A digital emulation of the Moog diode ladder filter configuration.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp32206248"></a>
<h2>Description</h2>
<p>
A digital emulation of the Moog diode ladder filter configuration.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp32206928"></a>
<h2>Syntax</h2>
<pre class="synopsis">ares <span class="command"><strong>moogvcf2</strong></span> asig, xfco, xres [,iscale, iskip]</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp32207984"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>iscale</em></span> (optional, default=0dBfs) -- internal
scaling factor, as the operation of the code requires the signal
to be in the range +/-1. Input is first divided by
<span class="emphasis"><em>iscale</em></span>, then output is mutliplied by
<span class="emphasis"><em>iscale</em></span>.
</p>
<p>
<span class="emphasis"><em>iskip</em></span> (optional, default=0) -- if non zero
skip the initialisation of the filter.
</p>
</div>
<div class="refsect1" title="Performance">
<a id="idp32283576"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>asig</em></span> -- input signal
</p>
<p>
<span class="emphasis"><em>xfco</em></span> -- filter cut-off frequency in
Hz. which may be i-,k-, or a-rate.
</p>
<p>
<span class="emphasis"><em>xres</em></span> -- amount of
resonance. Self-oscillation occurs when <span class="emphasis"><em>xres</em></span>
is approximately one. May be a-rate, i-rate, or k-rate.
</p>
<p>
<span class="emphasis"><em>moogvcf2</em></span> is a digital emulation of the Moog
diode ladder filter configuration. This emulation is based loosely
on the paper <span class="quote">“<span class="quote">Analyzing the Moog VCF with Considerations for
Digital Implementation</span>”</span> by Stilson and Smith (CCRMA). This
version was originally coded in Csound by Josep Comajuncosas. Some
modifications and conversion to C were done by Hans Mikelson and then
adjusted.
</p>
<p>
<span class="emphasis"><em>moogvcf2</em></span> is identical to <a class="link" href="moogvcf.html" title="moogvcf"><em class="citetitle">moogvcf</em></a>, except that the
<span class="emphasis"><em>iscale</em></span> parameter defaults to <a class="link" href="Zerodbfs.html" title="0dbfs"><em class="citetitle">0dbfs</em></a> instead of 0, guaranteeing that amplitude will usually be OK.
</p>
</div>
<div class="refsect1" title="Examples">
<a id="idp32288360"></a>
<h2>Examples</h2>
<p>
Here is an example of the moogvcf2 opcode. It uses the file <a class="ulink" href="examples/moogvcf2.csd" target="_top"><em class="citetitle">moogvcf2.csd</em></a>.
</p>
<div class="example">
<a id="idp32289344"></a>
<p class="title">
<strong>Example 493. Example of the moogvcf2 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 moogvcf2.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
aout <span class="opc">diskin2</span> "beats.wav", 1, 0, 1
kfco <span class="opc">line</span> 100, p3, 10000 <span class="comment">;filter-cutoff</span>
krez <span class="opc">init</span> p4
asig <span class="opc">moogvcf2</span> aout, kfco, krez
<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">i</span> 1 0 4 .1
<span class="stamnt">i</span> 1 + 4 .6
<span class="stamnt">i</span> 1 + 4 .9
<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="idp32291624"></a>
<h2>See Also</h2>
<p>
<a class="link" href="moogvcf.html" title="moogvcf"><em class="citetitle">moogvcf</em></a>,
<a class="link" href="biquad.html" title="biquad"><em class="citetitle">biquad</em></a>,
<a class="link" href="rezzy.html" title="rezzy"><em class="citetitle">rezzy</em></a>
</p>
</div>
<div class="refsect1" title="Credits">
<a id="idp32293600"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Hans Mikelson and John ffitch</td>
</tr>
<tr>
<td>October 1998/ July 2006</td>
</tr>
</table>
<p>
</p>
<p>New in Csound version 5.03</p>
</div>
</div>
<div class="navfooter">
<hr />
<table width="100%" summary="Navigation footer">
<tr>
<td width="40%" align="left"><a accesskey="p" href="moogvcf.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="moscil.html">Next</a></td>
</tr>
<tr>
<td width="40%" align="left" valign="top">moogvcf </td>
<td width="20%" align="center">
<a accesskey="h" href="index.html">Home</a>
</td>
<td width="40%" align="right" valign="top"> moscil</td>
</tr>
</table>
</div>
</body>
</html>
distrib
>
Mageia
>
5
>
x86_64
>
media
>
core-release
>
by-pkgid
>
b707d9a4ee443103660a75ccb6e51334
>
files
>
2224
