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<span class="refentrytitle">resonx</span>
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<p>resonx —
Emulates a stack of filters using the reson opcode.
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<div class="refsect1" title="Description">
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<h2>Description</h2>
<p>
<span class="emphasis"><em>resonx</em></span> is equivalent to a filters consisting of more layers of <a class="link" href="reson.html" title="reson"><em class="citetitle">reson</em></a> with the same arguments, serially connected. Using a stack of a larger number of filters allows a sharper cutoff. They are faster than using a larger number instances in a Csound orchestra of the old opcodes, because only one initialization and k- cycle are needed at time and the audio loop falls entirely inside the cache memory of processor.
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<div class="refsect1" title="Syntax">
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<h2>Syntax</h2>
<pre class="synopsis">ares <span class="command"><strong>resonx</strong></span> asig, kcf, kbw [, inumlayer] [, iscl] [, iskip]</pre>
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<h2>Initialization</h2>
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<span class="emphasis"><em>inumlayer</em></span> (optional) -- number of elements in the filter stack. Default value is 4.
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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 <a class="link" href="balance.html" title="balance"><em class="citetitle">balance</em></a>). The default value is 0.
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<span class="emphasis"><em>iskip</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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<div class="refsect1" title="Performance">
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<h2>Performance</h2>
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<span class="emphasis"><em>asig</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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<h2>See Also</h2>
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<a class="link" href="atonex.html" title="atonex"><em class="citetitle">atonex</em></a>,
<a class="link" href="tonex.html" title="tonex"><em class="citetitle">tonex</em></a>
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<div class="refsect1" title="Credits">
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<h2>Credits</h2>
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<td>Author: Gabriel Maldonado (adapted by John ffitch)</td>
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<td>Italy</td>
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<p>New in Csound version 3.49</p>
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