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<h2>
<span class="refentrytitle">resony</span>
</h2>
<p>resony —
A bank of second-order bandpass filters, connected in parallel.
</p>
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<div class="refsect1" title="Description">
<a id="id3162161"></a>
<h2>Description</h2>
<p>
A bank of second-order bandpass filters, connected in parallel.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="id3162183"></a>
<h2>Syntax</h2>
<pre class="synopsis">ares <span class="command"><strong>resony</strong></span> asig, kbf, kbw, inum, ksep [, isepmode] [, iscl] [, iskip]</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="id3162203"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>inum</em></span> -- number of filters
</p>
<p>
<span class="emphasis"><em>isepmode</em></span> (optional, default=0) -- if <span class="emphasis"><em>isepmode</em></span> = 0, the separation of center frequencies of each filter is generated logarithmically (using octave as unit of measure). If <span class="emphasis"><em>isepmode</em></span> not equal to 0, the separation of center frequencies of each filter is generated linearly (using Hertz). Default value is 0.
</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 <span class="emphasis"><em>kcf</em></span> 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 (e.g. <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="id3163195"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>asig</em></span> -- audio input signal
</p>
<p>
<span class="emphasis"><em>kbf</em></span> -- base frequency, i.e. center frequency of lowest filter in Hz
</p>
<p>
<span class="emphasis"><em>kbw</em></span> -- bandwidth in Hz
</p>
<p>
<span class="emphasis"><em>ksep</em></span> -- separation of the center frequency of filters in octaves
</p>
<p>
<span class="emphasis"><em>resony</em></span> is a bank of second-order bandpass filters, with k-rate variant frequency separation, base frequency and bandwidth, connected in parallel (i.e. the resulting signal is a mix of the output of each filter). The center frequency of each filter depends of <span class="emphasis"><em>kbf</em></span> and <span class="emphasis"><em>ksep</em></span> variables. The maximum number of filters is set to 100.
</p>
</div>
<div class="refsect1" title="Examples">
<a id="id3163256"></a>
<h2>Examples</h2>
<p>
Here is an example of the resony opcode. It uses the file <a class="ulink" href="examples/resony.csd" target="_top"><em class="citetitle">resony.csd</em></a>, and <a class="ulink" href="examples/beats.wav" target="_top"><em class="citetitle">beats.wav</em></a>.
</p>
<div class="example">
<a id="id3163280"></a>
<p class="title">
<b>Example 524. Example of the resony opcode.</b>
</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>
<span class="comment">; Audio out Audio in No messages</span>
-odac -iadc -d <span class="comment">;;;RT audio I/O</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o resony.wav -W ;;; for file output any platform</span>
<span class="csdtag"></CsOptions></span>
<span class="csdtag"><CsInstruments></span>
<span class="comment">; Initialize the global variables.</span>
<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">kr</span> <span class="op">=</span> 4410
<span class="ohdr">ksmps</span> <span class="op">=</span> 10
<span class="ohdr">nchnls</span> <span class="op">=</span> 1
<span class="comment">; Instrument #1.</span>
<span class="oblock">instr</span> 1
<span class="comment">; Use a nice sawtooth waveform.</span>
asig <span class="opc">vco</span> 32000, 220, 1
<span class="comment">; Vary the base frequency from 60 to 600 Hz.</span>
kbf <span class="opc">line</span> 60, p3, 600
kbw <span class="op">=</span> 50
inum <span class="op">=</span> 2
ksep <span class="op">=</span> 1
isepmode <span class="op">=</span> 0
iscl <span class="op">=</span> 1
a1 <span class="opc">resony</span> asig, kbf, kbw, inum, ksep, isepmode, iscl
<span class="opc">out</span> a1
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="comment">; Table #1, a sine wave for the vco opcode.</span>
<span class="stamnt">f</span> 1 0 16384 10 1
<span class="comment">; Play Instrument #1 for two seconds.</span>
<span class="stamnt">i</span> 1 0 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>
</div>
<div class="refsect1" title="Credits">
<a id="id3163317"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Gabriel Maldonado</td>
</tr>
<tr>
<td>Italy</td>
</tr>
<tr>
<td>1999</td>
</tr>
</table>
<p>
</p>
<p>Example written by Kevin Conder.</p>
<p>New in Csound version 3.56</p>
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