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authorLudvig Gunne Lindström <ludviggunnelindstrom@gmail.com>2026-07-17 11:43:24 +0200
committerLudvig Gunne Lindström <ludviggunnelindstrom@gmail.com>2026-11-08 14:15:04 +0100
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+<!-- Menu -->
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+<p><a href="/melisma-modules">Back to repository</a></p>
+<br/>
+<h1>Melisma modules</h1>
+
+
+<ul>
+ <li><a href="../index.html">Index</a></li>
+</ul>
+
+<h2>Contents</h2>
+<ul>
+<li><a href="#Class_biquad_lowpass">Class biquad.lowpass </a></li>
+</ul>
+
+
+<h2>Modules</h2>
+<ul class="nowrap">
+ <li><strong>biquad</strong></li>
+ <li><a href="../modules/expression.html">expression</a></li>
+ <li><a href="../modules/fs.html">fs</a></li>
+ <li><a href="../modules/keycallback.html">keycallback</a></li>
+ <li><a href="../modules/udp.html">udp</a></li>
+</ul>
+<h2>Classes</h2>
+<ul class="nowrap">
+ <li><a href="../classes/buffer.html">buffer</a></li>
+ <li><a href="../classes/delay.html">delay</a></li>
+ <li><a href="../classes/gain.html">gain</a></li>
+ <li><a href="../classes/interp.html">interp</a></li>
+ <li><a href="../classes/ladspa.html">ladspa</a></li>
+ <li><a href="../classes/mixer.html">mixer</a></li>
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+<div id="content">
+
+<h1>Module <code>biquad</code></h1>
+<p>Digital biquad filters.</p>
+<p>
+
+</p>
+
+
+<h2><a href="#Class_biquad_lowpass">Class biquad.lowpass </a></h2>
+<table class="function_list">
+ <tr>
+ <td class="name" nowrap><a href="#biquad.lowpass.init">biquad.lowpass.init(input)</a></td>
+ <td class="summary">Create a lowpass filter.</td>
+ </tr>
+ <tr>
+ <td class="name" nowrap><a href="#lowpass:cutoff">lowpass:cutoff(cut)</a></td>
+ <td class="summary">Set filter cutoff frequency.</td>
+ </tr>
+ <tr>
+ <td class="name" nowrap><a href="#lowpass:resonance">lowpass:resonance(res)</a></td>
+ <td class="summary">Set filter resonance.</td>
+ </tr>
+</table>
+
+<br/>
+<br/>
+
+
+ <h2 class="section-header has-description"><a name="Class_biquad_lowpass"></a>Class biquad.lowpass </h2>
+
+ <div class="section-description">
+ Lowpass filter.
+ </div>
+ <h3>Usage:</h3>
+ <pre class="example"><span class="keyword">local</span> mbiquad = <span class="global">require</span> <span class="string">'melisma.biquad'</span>
+<span class="keyword">local</span> input = ...
+<span class="keyword">local</span> lowpass = mbiquad.lowpass.<span class="function-name">init</span>(node, <span class="number">2000</span>, <span class="number">0.6</span>)
+lowpass:<span class="function-name">resonance</span>(<span class="number">1000</span>)
+lowpass:<span class="function-name">cutoff</span>(<span class="number">0.25</span>)</pre>
+ <dl class="function">
+ <dt>
+ <a name = "biquad.lowpass.init"></a>
+ <strong>biquad.lowpass.init(input)</strong>
+ </dt>
+ <dd>
+ Create a lowpass filter.
+
+
+ <h3>Parameters:</h3>
+ <ul>
+ <li><span class="parameter">input</span>
+ <span class="types"><span class="type">channel</span></span>
+ Input signal.
+ </li>
+ </ul>
+
+ <h3>Returns:</h3>
+ <ol>
+
+ <span class="types"><a class="type" href="../modules/biquad.html#biquad.lowpass">biquad.lowpass</a></span>
+ The newly created lowpass filter.
+ </ol>
+
+
+
+
+</dd>
+ <dt>
+ <a name = "lowpass:cutoff"></a>
+ <strong>lowpass:cutoff(cut)</strong>
+ </dt>
+ <dd>
+ Set filter cutoff frequency.
+
+
+ <h3>Parameters:</h3>
+ <ul>
+ <li><span class="parameter">cut</span>
+ <span class="types"><span class="type">number</span></span>
+ Cutoff frequency.
+ </li>
+ </ul>
+
+
+
+
+
+</dd>
+ <dt>
+ <a name = "lowpass:resonance"></a>
+ <strong>lowpass:resonance(res)</strong>
+ </dt>
+ <dd>
+ Set filter resonance.
+
+
+ <h3>Parameters:</h3>
+ <ul>
+ <li><span class="parameter">res</span>
+ <span class="types"><span class="type">number</span></span>
+ Resonance.
+ </li>
+ </ul>
+
+
+
+
+
+</dd>
+</dl>
+
+
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