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<div class="refentry" title="reverbsc">
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<h2>
<span class="refentrytitle">reverbsc</span>
</h2>
<p>reverbsc —
8 delay line stereo FDN reverb, based on work by Sean Costello
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp40816344"></a>
<h2>Description</h2>
<p>
8 delay line stereo FDN reverb, with feedback matrix based upon physical
modeling scattering junction of 8 lossless waveguides of equal characteristic
impedance. Based on Csound orchestra version by Sean Costello.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp40872280"></a>
<h2>Syntax</h2>
<pre class="synopsis">aoutL, aoutR <span class="command"><strong>reverbsc</strong></span> ainL, ainR, kfblvl, kfco[, israte[, ipitchm[, iskip]]] </pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp40873440"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>israte</em></span>
(optional, defaults to the orchestra sample rate) -- assume a sample
rate of israte. This is normally set to sr, but a different setting can
be useful for special effects.
</p>
<p>
<span class="emphasis"><em>ipitchm</em></span>
(optional, defaults to 1) -- depth of random variation added to
delay times, in the range 0 to 10. The default is 1, but this may be
too high and may need to be reduced for held pitches such as piano tones.
</p>
<p>
<span class="emphasis"><em>iskip</em></span>
(optional, defaults to zero) -- if non-zero, initialization of the
opcode is skipped, whenever possible.
</p>
</div>
<div class="refsect1" title="Performance">
<a id="idp40875960"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>aoutL, aoutR</em></span>
-- output signals for left and right channel
</p>
<p>
<span class="emphasis"><em>ainL, ainR</em></span>
-- left and right channel input. Note that having an input signal
on either the left or right channel only will still result in
having reverb output on both channels, making this unit more
suitable for reverberating stereo input than the
<a class="link" href="freeverb.html" title="freeverb">freeverb</a> opcode.
</p>
<p>
<span class="emphasis"><em>kfblvl</em></span>
-- feedback level, in the range 0 to 1. 0.6 gives a good small
"live" room sound, 0.8 a small hall, and 0.9 a large hall.
A setting of exactly 1 means infinite length, while higher values
will make the opcode unstable.
</p>
<p>
<span class="emphasis"><em>kfco</em></span>
-- cutoff frequency of simple first order lowpass filters in the
feedback loop of delay lines, in Hz. Should be in the range 0 to
israte/2 (not sr/2). A lower value means faster decay in the high
frequency range.
</p>
</div>
<div class="refsect1" title="Examples">
<a id="idp40879448"></a>
<h2>Examples</h2>
<p>
Here is an example of the <span class="emphasis"><em>reverbsc</em></span> opcode. It uses the file <a class="ulink" href="examples/reverbsc.csd" target="_top"><em class="citetitle">reverbsc.csd</em></a>.
</p>
<div class="example">
<a id="idp40880648"></a>
<p class="title">
<strong>Example 722. An example of the reverbsc 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>
<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 reverbsc.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> 48000
<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
a1 <span class="opc">vco2</span> 0.85, 440, 10
kfrq <span class="opc">port</span> 100, 0.004, 20000
a1 <span class="opc">butterlp</span> a1, kfrq
a2 <span class="opc">linseg</span> 0, 0.003, 1, 0.01, 0.7, 0.005, 0, 1, 0
a1 <span class="op">=</span> a1 <span class="op">*</span> a2
a2 <span class="op">=</span> a1 <span class="op">*</span> p5
a1 <span class="op">=</span> a1 <span class="op">*</span> p4
<span class="opc">denorm</span> a1, a2
aL, aR <span class="opc">reverbsc</span> a1, a2, 0.85, 12000, sr, 0.5, 1
<span class="opc">outs</span> a1 <span class="op">+</span> aL, a2 <span class="op">+</span> aR
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">i</span> 1 0 1 0.71 0.71
<span class="stamnt">i</span> 1 1 1 0 1
<span class="stamnt">i</span> 1 2 1 -0.71 0.71
<span class="stamnt">i</span> 1 3 1 1 0
<span class="stamnt">i</span> 1 4 4 0.71 0.71
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
</div>
<p><br class="example-break" />
</p>
</div>
<div class="refsect1" title="Credits">
<a id="idp40882944"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Istvan Varga</td>
</tr>
<tr>
<td>2005</td>
</tr>
</table>
<p>
</p>
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