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<span class="refentrytitle">resonxk</span>
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<p>resonxk —
Control signal resonant filter stack.
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<div class="refsect1" title="Description">
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<h2>Description</h2>
<p>
<span class="emphasis"><em>resonxk</em></span> is equivalent to a group of resonk filters, with the same arguments, serially connected. Using a stack of a larger number of filters allows a sharper cutoff.
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<div class="refsect1" title="Syntax">
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<h2>Syntax</h2>
<pre class="synopsis">kres <span class="command"><strong>resonxk</strong></span> ksig, kcf, kbw[, inumlayer, iscl, istor]</pre>
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<h2>Initialization</h2>
<p>
<span class="emphasis"><em>inumlayer</em></span> - number of elements of filter stack. Default value is 4. Maximum value is 10
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<p>
<span class="emphasis"><em>iscl</em></span> (optional, default=0) - coded scaling factor for resonators. A value of 1 signifies a peak response factor of 1, i.e. all frequencies other than kcf are attenuated in accordance with the (normalized) response curve. A value of 2 raises the response factor so that its overall RMS value equals 1. (This intended equalization of input and output power assumes all frequencies are physically present; hence it is most applicable to white noise.) A zero value signifies no scaling of the signal, leaving that to some later adjustment (see balance). The default value is 0.
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<span class="emphasis"><em>istor</em></span> (optional, default=0) -- 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.
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<h2>Performance</h2>
<p>
<span class="emphasis"><em>kres</em></span> - output signal
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<p>
<span class="emphasis"><em>ksig</em></span> - input signal
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<span class="emphasis"><em>kcf</em></span> - the center frequency of the filter, or frequency position of the peak response.
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<span class="emphasis"><em>kbw</em></span> - bandwidth of the filter (the Hz difference between the upper and lower half-power points)
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<p><span class="emphasis"><em>resonxk</em></span> is a lot faster than using individual instances in Csound orchestra of the old opcodes, because only one initialization and 'k' cycle are needed at a time, and the audio loop falls enterely inside the cache memory of processor.
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<div class="refsect1" title="Credits">
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<h2>Credits</h2>
<p>Written by Gabriel Maldonado.</p>
<p>New in Csound 5 (Previously available only on CsoundAV)</p>
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