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<h2>
<span class="refentrytitle">resonx</span>
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<p>resonx —
Emulates a stack of filters using the reson opcode.
</p>
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<div class="refsect1" title="Description">
<a id="idp40601416"></a>
<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.
</p>
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<div class="refsect1" title="Syntax">
<a id="idp40634768"></a>
<h2>Syntax</h2>
<pre class="synopsis">ares <span class="command"><strong>resonx</strong></span> asig, kcf, kbw [, inumlayer] [, iscl] [, iskip]</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp40635920"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>inumlayer</em></span> (optional) -- number of elements in the filter stack. Default value is 4.
</p>
<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.
</p>
<p>
<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.
</p>
</div>
<div class="refsect1" title="Performance">
<a id="idp40638992"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>asig</em></span> -- input signal
</p>
<p>
<span class="emphasis"><em>kcf</em></span> -- the center frequency of the filter, or frequency position of the peak response.
</p>
<p>
<span class="emphasis"><em>kbw</em></span> -- bandwidth of the filter (the Hz difference between the upper and lower half-power points)
</p>
</div>
<div class="refsect1" title="Examples">
<a id="idp40640792"></a>
<h2>Examples</h2>
<p>
Here is an example of the resonx opcodes. It uses the file <a class="ulink" href="examples/resonx.csd" target="_top"><em class="citetitle">resonx.csd</em></a>.
</p>
<div class="example">
<a id="idp40641760"></a>
<p class="title">
<strong>Example 716. Example of the resonx opcodes.</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 resonx.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 <span class="comment">; unfiltered noise</span>
kenv <span class="opc">linseg</span> 0, p3<span class="op">*</span>.5, 1, p3<span class="op">*</span>.5, 0 <span class="comment">;envelope</span>
asig <span class="opc">rand</span> 0.7 <span class="comment">;white noise</span>
<span class="opc">outs</span> asig<span class="op">*</span>kenv, asig<span class="op">*</span>kenv
<span class="oblock">endin</span>
<span class="oblock">instr</span> 2 <span class="comment">; filtered noise</span>
kenv <span class="opc">linseg</span> 0, p3<span class="op">*</span>.5, 1, p3<span class="op">*</span>.5, 0 <span class="comment">;envelope</span>
asig <span class="opc">rand</span> 0.7
kcf <span class="opc">line</span> 300, p3, 2000
afilt <span class="opc">resonx</span> asig, kcf, 300, 4
asig <span class="opc">balance</span> afilt, asig
<span class="opc">outs</span> asig<span class="op">*</span>kenv, asig<span class="op">*</span>kenv
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">i</span> 1 0 2
<span class="stamnt">i</span> 2 3 2
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
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<p><br class="example-break" />
</p>
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<div class="refsect1" title="See Also">
<a id="idp40644032"></a>
<h2>See Also</h2>
<p>
<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>
</p>
</div>
<div class="refsect1" title="Credits">
<a id="idp40645528"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Gabriel Maldonado (adapted by John ffitch)</td>
</tr>
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<td>Italy</td>
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<p>
</p>
<p>New in Csound version 3.49</p>
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