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<h2>
<span class="refentrytitle">moogvcf2</span>
</h2>
<p>moogvcf2 —
A digital emulation of the Moog diode ladder filter configuration.
</p>
</div>
<div class="refsect1">
<a id="idm281472912336712"></a>
<h2>Description</h2>
<p>
A digital emulation of the Moog diode ladder filter configuration.
</p>
</div>
<div class="refsect1">
<a id="idm281472912335432"></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">
<a id="idm281472912293240"></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">
<a id="idm281472912289640"></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">
<a id="idm281472912280744"></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="idm281472912278888"></a>
<p class="title">
<strong>Example 578. 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>
<div class="refsect1">
<a id="idm281472736391416"></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>
-odac <span class="c1">;;;realtime audio out</span>
<span class="c1">;-iadc ;;;uncomment -iadc if realtime audio input is needed too</span>
<span class="c1">; For Non-realtime ouput leave only the line below:</span>
<span class="c1">; -o moogvcf2.wav -W ;;; for file output any platform</span>
<span class="nt"></CsOptions></span>
<span class="nt"><CsInstruments></span>
<span class="vg">sr</span> <span class="o">=</span> <span class="mi">44100</span>
<span class="vg">ksmps</span> <span class="o">=</span> <span class="mi">32</span>
<span class="vg">nchnls</span> <span class="o">=</span> <span class="mi">2</span>
<span class="vg">0dbfs</span> <span class="o">=</span> <span class="mi">1</span>
<span class="kd">instr</span> <span class="nf">1</span>
a<span class="n">out</span> <span class="nb">diskin2</span> <span class="s">"beats.wav"</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">1</span>
k<span class="n">fco</span> <span class="nb">line</span> <span class="mi">100</span><span class="p">,</span> <span class="nb">p3</span><span class="p">,</span> <span class="mi">10000</span> <span class="c1">;filter-cutoff</span>
k<span class="n">rez</span> <span class="nb">init</span> <span class="nb">p4</span>
a<span class="n">sig</span> <span class="nb">moogvcf2</span> a<span class="n">out</span><span class="p">,</span> k<span class="n">fco</span><span class="p">,</span> k<span class="n">rez</span>
<span class="nb">outs</span> a<span class="n">sig</span><span class="p">,</span> a<span class="n">sig</span>
<span class="kd">endin</span>
<span class="nt"></CsInstruments></span>
<span class="nt"><CsScore></span>
<span class="nb">i</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mi">4</span> <span class="mf">.1</span>
<span class="nb">i</span> <span class="mi">1</span> <span class="o">+</span> <span class="mi">4</span> <span class="mf">.6</span>
<span class="nb">i</span> <span class="mi">1</span> <span class="o">+</span> <span class="mi">4</span> <span class="mf">.9</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="idm281472912274600"></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">
<a id="idm281472912270632"></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>
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