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<div class="refentry">
<a id="resonk"></a>
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<h2>
<span class="refentrytitle">resonk</span>
</h2>
<p>resonk —
A second-order resonant filter.
</p>
</div>
<div class="refsect1">
<a id="idm281472895482264"></a>
<h2>Description</h2>
<p>
A second-order resonant filter.
</p>
</div>
<div class="refsect1">
<a id="idm281472895409640"></a>
<h2>Syntax</h2>
<pre class="synopsis">kres <span class="command"><strong>resonk</strong></span> ksig, kcf, kbw [, iscl] [, iskip]</pre>
</div>
<div class="refsect1">
<a id="idm281472895407416"></a>
<h2>Initialization</h2>
<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">
<a id="idm281472895403144"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>kres</em></span> -- the output signal at control-rate.
</p>
<p>
<span class="emphasis"><em>ksig</em></span> -- the input signal at control-rate.
</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>
<p>
<span class="emphasis"><em>resonk</em></span> is like <a class="link" href="reson.html" title="reson"><em class="citetitle">reson</em></a> except its output is at control-rate rather than audio rate.
</p>
</div>
<div class="refsect1">
<a id="idm281472895397096"></a>
<h2>Examples</h2>
<p>
Here is an example of the resonk opcode. It uses the file <a class="ulink" href="examples/resonk.csd" target="_top"><em class="citetitle">resonk.csd</em></a>.
</p>
<div class="example">
<a id="idm281472895395240"></a>
<p class="title">
<strong>Example 823. Example of the resonk 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>
<div class="refsect1">
<a id="idm281472716608600"></a>
<pre class="programlisting">
<span class="nt"><CsoundSynthesizer></span>
<span class="nt"><CsOptions></span>
<span class="c1">; Select audio/midi flags here according to platform</span>
-odac <span class="c1">;;;realtime audio out</span>
<span class="c1">;-iadc ;;;uncomment -iadc if realtime audio input is needed too</span>
<span class="c1">; For Non-realtime ouput leave only the line below:</span>
<span class="c1">; -o resonk.wav -W ;;; for file output any platform</span>
<span class="nt"></CsOptions></span>
<span class="nt"><CsInstruments></span>
<span class="vg">sr</span> <span class="o">=</span> <span class="mi">44100</span>
<span class="vg">ksmps</span> <span class="o">=</span> <span class="mi">32</span>
<span class="vg">nchnls</span> <span class="o">=</span> <span class="mi">2</span>
<span class="vg">0dbfs</span> <span class="o">=</span> <span class="mi">1</span>
gi<span class="n">sin</span> <span class="nb">ftgen</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">2</span><span class="o">^</span><span class="mi">10</span><span class="p">,</span> <span class="mi">10</span><span class="p">,</span> <span class="mi">1</span>
<span class="kd">instr</span> <span class="nf">1</span>
k<span class="n">sig</span> <span class="nb">randomh</span> <span class="mi">400</span><span class="p">,</span> <span class="mi">1800</span><span class="p">,</span> <span class="mi">150</span>
a<span class="n">out</span> <span class="nb">poscil</span> <span class="mf">.2</span><span class="p">,</span> <span class="mi">1000</span><span class="o">+</span>k<span class="n">sig</span><span class="p">,</span> gi<span class="n">sin</span>
<span class="nb">outs</span> a<span class="n">out</span><span class="p">,</span> a<span class="n">out</span>
<span class="kd">endin</span>
<span class="kd">instr</span> <span class="nf">2</span>
k<span class="n">sig</span> <span class="nb">randomh</span> <span class="mi">400</span><span class="p">,</span> <span class="mi">1800</span><span class="p">,</span> <span class="mi">150</span>
k<span class="n">hp</span> <span class="nb">line</span> <span class="mi">1</span><span class="p">,</span> <span class="nb">p3</span><span class="p">,</span> <span class="mi">400</span> <span class="c1">;vary high-pass</span>
k<span class="n">sig</span> <span class="nb">resonk</span> k<span class="n">sig</span><span class="p">,</span> k<span class="n">hp</span><span class="p">,</span> <span class="mi">50</span>
a<span class="n">out</span> <span class="nb">poscil</span> <span class="mf">.2</span><span class="p">,</span> <span class="mi">1000</span><span class="o">+</span>k<span class="n">sig</span><span class="p">,</span> gi<span class="n">sin</span>
<span class="nb">outs</span> a<span class="n">out</span><span class="p">,</span> a<span class="n">out</span>
<span class="kd">endin</span>
<span class="nt"></CsInstruments></span>
<span class="nt"><CsScore></span>
<span class="nb">i</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mi">5</span>
<span class="nb">i</span> <span class="mi">2</span> <span class="mf">5.5</span> <span class="mi">5</span>
<span class="nb">e</span>
<span class="nt"></CsScore></span>
<span class="nt"></CsoundSynthesizer></span>
</pre>
</div>
</div>
</div>
<p><br class="example-break" />
</p>
</div>
<div class="refsect1">
<a id="idm281472895391048"></a>
<h2>See Also</h2>
<p>
<a class="link" href="areson.html" title="areson"><em class="citetitle">areson</em></a>,
<a class="link" href="aresonk.html" title="aresonk"><em class="citetitle">aresonk</em></a>,
<a class="link" href="atone.html" title="atone"><em class="citetitle">atone</em></a>,
<a class="link" href="atonek.html" title="atonek"><em class="citetitle">atonek</em></a>,
<a class="link" href="port.html" title="port"><em class="citetitle">port</em></a>,
<a class="link" href="portk.html" title="portk"><em class="citetitle">portk</em></a>,
<a class="link" href="reson.html" title="reson"><em class="citetitle">reson</em></a>,
<a class="link" href="tone.html" title="tone"><em class="citetitle">tone</em></a>,
<a class="link" href="tonek.html" title="tonek"><em class="citetitle">tonek</em></a>
</p>
</div>
<div class="refsect1">
<a id="idm281472895381320"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Robin Whittle</td>
</tr>
<tr>
<td>Australia</td>
</tr>
<tr>
<td>May 1997</td>
</tr>
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</p>
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