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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">
<a id="idm281472874192216"></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">
<a id="idm281472874190600"></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">
<a id="idm281472874188360"></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">
<a id="idm281472874183720"></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">
<a id="idm281472874177720"></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="idm281472874175864"></a>
<p class="title">
<strong>Example 1065. 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>
<div class="refsect1">
<a id="idm281472694433768"></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>
<span class="c1">; Audio out Audio in</span>
-odac -iadc -M0 <span class="c1">;;;RT audio I/O with MIDI in</span>
<span class="nt"></CsOptions></span>
<span class="nt"><CsInstruments></span>
<span class="c1">; Example by Jonathan Murphy and Charles Gran 2007</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">10</span>
<span class="vg">nchnls</span> <span class="o">=</span> <span class="mi">2</span>
<span class="c1">; new, and important. Make sure that midi note events are only</span>
<span class="c1">; received by instruments that actually need them.</span>
<span class="c1">; turn default midi routing off</span>
<span class="nb">massign</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">0</span>
<span class="c1">; route note events on channel 1 to instr 1</span>
<span class="nb">massign</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">1</span>
<span class="c1">; Define your midi controllers</span>
<span class="cp">#define</span> <span class="cp">C1</span> <span class="p">#</span><span class="cp">21</span><span class="p">#</span>
<span class="cp">#define</span> <span class="cp">C2</span> <span class="p">#</span><span class="cp">22</span><span class="p">#</span>
<span class="cp">#define</span> <span class="cp">C3</span> <span class="p">#</span><span class="cp">23</span><span class="p">#</span>
<span class="c1">; Initialize MIDI controllers</span>
<span class="nb">initc7</span> <span class="mi">1</span><span class="p">,</span> <span class="cp">$C1</span><span class="p">,</span> <span class="mf">0.5</span> <span class="c1">;delay send</span>
<span class="nb">initc7</span> <span class="mi">1</span><span class="p">,</span> <span class="cp">$C2</span><span class="p">,</span> <span class="mf">0.5</span> <span class="c1">;delay: time to zero</span>
<span class="nb">initc7</span> <span class="mi">1</span><span class="p">,</span> <span class="cp">$C3</span><span class="p">,</span> <span class="mf">0.5</span> <span class="c1">;delay: rate </span>
ga<span class="n">osc</span> <span class="nb">init</span> <span class="mi">0</span>
<span class="c1">; Define an opcode to "smooth" the MIDI controller signal</span>
<span class="kd">opcode</span> <span class="nf">smooth</span><span class="p">,</span> <span class="kt">k</span><span class="p">,</span> <span class="kt">k</span>
k<span class="n">in</span> <span class="nb">xin</span>
k<span class="n">port</span> <span class="nb">linseg</span> <span class="mi">0</span><span class="p">,</span> <span class="mf">0.0001</span><span class="p">,</span> <span class="mf">0.01</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mf">0.01</span>
k<span class="n">in</span> <span class="nb">portk</span> k<span class="n">in</span><span class="p">,</span> k<span class="n">port</span>
<span class="nb">xout</span> k<span class="n">in</span>
<span class="kd">endop</span>
<span class="kd">instr</span> <span class="nf">1</span>
<span class="c1">; Generate a sine wave at the frequency of the MIDI note that triggered the intrument</span>
i<span class="n">fqc</span> <span class="nb">cpsmidi</span>
i<span class="n">amp</span> <span class="nb">ampmidi</span> <span class="mi">10000</span>
a<span class="n">env</span> <span class="nb">linenr</span> i<span class="n">amp</span><span class="p">,</span> <span class="mf">.01</span><span class="p">,</span> <span class="mf">.1</span><span class="p">,</span> <span class="mf">.01</span> <span class="c1">;envelope</span>
a<span class="n">1</span> <span class="nb">oscil</span> a<span class="n">env</span><span class="p">,</span> i<span class="n">fqc</span><span class="p">,</span> <span class="mi">1</span>
<span class="c1">; All sound goes to the global variable gaosc</span>
ga<span class="n">osc</span> <span class="o">=</span> ga<span class="n">osc</span> <span class="o">+</span> a<span class="n">1</span>
<span class="kd">endin</span>
<span class="kd">instr</span> <span class="nf">198</span> <span class="c1">; ECHO</span>
k<span class="n">cmbsnd</span> <span class="nb">ctrl7</span> <span class="mi">1</span><span class="p">,</span> <span class="cp">$C1</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">1</span> <span class="c1">;delay send</span>
k<span class="n">time</span> <span class="nb">ctrl7</span> <span class="mi">1</span><span class="p">,</span> <span class="cp">$C2</span><span class="p">,</span> <span class="mf">0.01</span><span class="p">,</span> <span class="mi">6</span> <span class="c1">;time loop fades out</span>
k<span class="n">loop</span> <span class="nb">ctrl7</span> <span class="mi">1</span><span class="p">,</span> <span class="cp">$C3</span><span class="p">,</span> <span class="mf">0.01</span><span class="p">,</span> <span class="mi">1</span> <span class="c1">;loop speed</span>
<span class="c1">; Receive MIDI controller values and then smooth them</span>
k<span class="n">cmbsnd</span> <span class="nf">smooth</span> k<span class="n">cmbsnd</span>
k<span class="n">time</span> <span class="nf">smooth</span> k<span class="n">time</span>
k<span class="n">loop</span> <span class="nf">smooth</span> k<span class="n">loop</span>
i<span class="n">maxlpt</span> <span class="o">=</span> <span class="mi">1</span> <span class="c1">;max loop time</span>
<span class="c1">; Create a variable reverberation (delay) of the gaosc signal</span>
a<span class="n">comb</span> <span class="nb">vcomb</span> ga<span class="n">osc</span><span class="p">,</span> k<span class="n">time</span><span class="p">,</span> k<span class="n">loop</span><span class="p">,</span> i<span class="n">maxlpt</span><span class="p">,</span> <span class="mi">1</span>
a<span class="n">out</span> <span class="o">=</span> <span class="p">(</span>a<span class="n">comb</span> <span class="o">*</span> k<span class="n">cmbsnd</span><span class="p">)</span> <span class="o">+</span> ga<span class="n">osc</span> <span class="o">*</span> <span class="p">(</span><span class="mi">1</span> <span class="o">-</span> k<span class="n">cmbsnd</span><span class="p">)</span>
<span class="nb">outs</span> a<span class="n">out</span><span class="p">,</span> a<span class="n">out</span>
ga<span class="n">osc</span> <span class="o">=</span> <span class="mi">0</span>
<span class="kd">endin</span>
<span class="nt"></CsInstruments></span>
<span class="nt"><CsScore></span>
<span class="nb">f</span><span class="mi">1</span> <span class="mi">0</span> <span class="mi">16384</span> <span class="mi">10</span> <span class="mi">1</span>
<span class="nb">i</span><span class="mi">198</span> <span class="mi">0</span> <span class="mi">10000</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="idm281472874171576"></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">
<a id="idm281472874166648"></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>
</tr>
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