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<div class="refentry" title="moogladder">
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<h2>
<span class="refentrytitle">moogladder</span>
</h2>
<p>moogladder —
Moog ladder lowpass filter.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp32132192"></a>
<h2>Description</h2>
<p>
Moogladder is an new digital implementation of the Moog ladder filter based on
the work of Antti Huovilainen, described in the paper "Non-Linear Digital
Implementation of the Moog Ladder Filter" (Proceedings of DaFX04, Univ of Napoli).
This implementation is probably a more accurate digital representation of
the original analogue filter.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp32133144"></a>
<h2>Syntax</h2>
<pre class="synopsis">asig <span class="command"><strong>moogladder</strong></span> ain, kcf, kres[, istor]</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp32143648"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>istor</em></span> --initial disposition of internal data space. Since
filtering incorporates a feedback loop of previous output,
the initial status of the storage space used is significant.
A zero value will clear the space; a non-zero value will allow
previous information to remain. The default value is 0.
</p>
</div>
<div class="refsect1" title="Performance">
<a id="idp32144768"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>asig</em></span> -- input signal.
</p>
<p>
<span class="emphasis"><em>kcf</em></span> -- filter cutoff frequency
</p>
<p>
<span class="emphasis"><em>kres</em></span> -- resonance, generally < 1, but not limited to it.
Higher than 1 resonance values might cause aliasing,
analogue synths generally allow resonances to be above 1.
</p>
</div>
<div class="refsect1" title="Examples">
<a id="idp32220248"></a>
<h2>Examples</h2>
<p>
Here is an example of the moogladder opcode. It uses the file <a class="ulink" href="examples/moogladder.csd" target="_top"><em class="citetitle">moogladder.csd</em></a>.
</p>
<div class="example">
<a id="idp32221224"></a>
<p class="title">
<strong>Example 491. Example of the moogladder 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 moogladder.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
kfe <span class="opc">expseg</span> 500, p3<span class="op">*</span>0.9, 1800, p3<span class="op">*</span>0.1, 3000
asig <span class="opc">buzz</span> 1, 100, 20, 1
kres <span class="opc">line</span> .1, p3, .99 <span class="comment">;increase resonance</span>
afil <span class="opc">moogladder</span> asig, kfe, kres
<span class="opc">outs</span> afil, afil
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">f</span> 1 0 4096 10 1
<span class="stamnt">i</span> 1 0 10
<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="Credits">
<a id="idp32223504"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Victor Lazzarini</td>
</tr>
<tr>
<td>January 2005</td>
</tr>
</table>
<p>
</p>
<p>New plugin in version 5</p>
<p>January 2005.</p>
</div>
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