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<div class="refentry" title="vcomb">
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<h2>
<span class="refentrytitle">vcomb</span>
</h2>
<p>vcomb —
Variably reverberates an input signal with a <span class="quote">“<span class="quote">colored</span>”</span> frequency response.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp51113088"></a>
<h2>Description</h2>
<p>
Variably reverberates an input signal with a <span class="quote">“<span class="quote">colored</span>”</span> frequency response.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp51147888"></a>
<h2>Syntax</h2>
<pre class="synopsis">ares <span class="command"><strong>vcomb</strong></span> asig, krvt, xlpt, imaxlpt [, iskip] [, insmps]</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp51149000"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>imaxlpt</em></span> -- maximum loop time for <span class="emphasis"><em>klpt</em></span>
</p>
<p>
<span class="emphasis"><em>iskip</em></span> (optional, default=0) -- initial disposition of delay-loop data space (cf. <a class="link" href="reson.html" title="reson"><em class="citetitle">reson</em></a>). The default value is 0.
</p>
<p>
<span class="emphasis"><em>insmps</em></span> (optional, default=0) -- delay amount, as a number of samples.
</p>
</div>
<div class="refsect1" title="Performance">
<a id="idp51151520"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>krvt</em></span> -- the reverberation time (defined as the time in seconds for a signal to decay to 1/1000, or 60dB down from its original amplitude).
</p>
<p>
<span class="emphasis"><em>xlpt</em></span> -- variable loop time in seconds, same as <span class="emphasis"><em>ilpt</em></span> in <span class="emphasis"><em>comb</em></span>. Loop time can be as large as <span class="emphasis"><em>imaxlpt</em></span>.
</p>
<p>
This filter reiterates input with an echo density determined by loop time <span class="emphasis"><em>xlpt</em></span>. The attenuation rate is independent and is determined by <span class="emphasis"><em>krvt</em></span>, the reverberation time (defined as the time in seconds for a signal to decay to 1/1000, or 60dB down from its original amplitude). Output will appear only after <span class="emphasis"><em>ilpt</em></span> seconds.
</p>
</div>
<div class="refsect1" title="Examples">
<a id="idp51154768"></a>
<h2>Examples</h2>
<p>
Here is an example of the vcomb opcode. It uses the file <a class="ulink" href="examples/vcomb.csd" target="_top"><em class="citetitle">vcomb.csd</em></a>.
</p>
<div class="example">
<a id="idp51155736"></a>
<p class="title">
<strong>Example 933. Example of the vcomb 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</span>
-odac -iadc -M0 <span class="comment">;;;RT audio I/O with MIDI in</span>
<span class="csdtag"></CsOptions></span>
<span class="csdtag"><CsInstruments></span>
<span class="comment">; Example by Jonathan Murphy and Charles Gran 2007</span>
<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">ksmps</span> <span class="op">=</span> 10
<span class="ohdr">nchnls</span> <span class="op">=</span> 2
<span class="comment">; new, and important. Make sure that midi note events are only</span>
<span class="comment">; received by instruments that actually need them.</span>
<span class="comment">; turn default midi routing off</span>
<span class="ohdr">massign</span> 0, 0
<span class="comment">; route note events on channel 1 to instr 1</span>
<span class="ohdr">massign</span> 1, 1
<span class="comment">; Define your midi controllers</span>
<span class="omacro">#define</span> C1 #21#
<span class="omacro">#define</span> C2 #22#
<span class="omacro">#define</span> C3 #23#
<span class="comment">; Initialize MIDI controllers</span>
<span class="opc">initc7</span> 1, $C1, 0.5 <span class="comment">;delay send</span>
<span class="opc">initc7</span> 1, $C2, 0.5 <span class="comment">;delay: time to zero</span>
<span class="opc">initc7</span> 1, $C3, 0.5 <span class="comment">;delay: rate </span>
gaosc <span class="opc">init</span> 0
<span class="comment">; Define an opcode to "smooth" the MIDI controller signal</span>
<span class="oblock">opcode</span> smooth, k, <span class="opc">k</span>
kin <span class="opc">xin</span>
kport <span class="opc">linseg</span> 0, 0.0001, 0.01, 1, 0.01
kin <span class="opc">portk</span> kin, kport
<span class="opc">xout</span> kin
<span class="oblock">endop</span>
<span class="oblock">instr</span> 1
<span class="comment">; Generate a sine wave at the frequency of the MIDI note that triggered the intrument</span>
ifqc <span class="opc">cpsmidi</span>
iamp <span class="opc">ampmidi</span> 10000
aenv <span class="opc">linenr</span> iamp, .01, .1, .01 <span class="comment">;envelope</span>
a1 <span class="opc">oscil</span> aenv, ifqc, 1
<span class="comment">; All sound goes to the global variable gaosc</span>
gaosc <span class="op">=</span> gaosc <span class="op">+</span> a1
<span class="oblock">endin</span>
<span class="oblock">instr</span> 198 <span class="comment">; ECHO</span>
kcmbsnd <span class="opc">ctrl7</span> 1, $C1, 0, 1 <span class="comment">;delay send</span>
ktime <span class="opc">ctrl7</span> 1, $C2, 0.01, 6 <span class="comment">;time loop fades out</span>
kloop <span class="opc">ctrl7</span> 1, $C3, 0.01, 1 <span class="comment">;loop speed</span>
<span class="comment">; Receive MIDI controller values and then smooth them</span>
kcmbsnd smooth kcmbsnd
ktime smooth ktime
kloop smooth kloop
imaxlpt <span class="op">=</span> 1 <span class="comment">;max loop time</span>
<span class="comment">; Create a variable reverberation (delay) of the gaosc signal</span>
acomb <span class="opc">vcomb</span> gaosc, ktime, kloop, imaxlpt, 1
aout <span class="op">=</span> (acomb <span class="op">*</span> kcmbsnd) <span class="op">+</span> gaosc <span class="op">*</span> (1 <span class="op">-</span> kcmbsnd)
<span class="opc">outs</span> aout, aout
gaosc <span class="op">=</span> 0
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">f</span>1 0 16384 10 1
<span class="stamnt">i</span>198 0 10000
<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="idp51158008"></a>
<h2>See Also</h2>
<p>
<a class="link" href="alpass.html" title="alpass"><em class="citetitle">alpass</em></a>,
<a class="link" href="comb.html" title="comb"><em class="citetitle">comb</em></a>,
<a class="link" href="reverb.html" title="reverb"><em class="citetitle">reverb</em></a>,
<a class="link" href="valpass.html" title="valpass"><em class="citetitle">valpass</em></a>
</p>
</div>
<div class="refsect1" title="Credits">
<a id="idp51160464"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: William <span class="quote">“<span class="quote">Pete</span>”</span> Moss</td>
</tr>
<tr>
<td>University of Texas at Austin</td>
</tr>
<tr>
<td>Austin, Texas USA</td>
</tr>
<tr>
<td>January 2002</td>
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