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<div class="refentry" title="valpass">
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<h2>
<span class="refentrytitle">valpass</span>
</h2>
<p>valpass —
Variably reverberates an input signal with a flat frequency response.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp50196048"></a>
<h2>Description</h2>
<p>
Variably reverberates an input signal with a flat frequency response.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp50196712"></a>
<h2>Syntax</h2>
<pre class="synopsis">ares <span class="command"><strong>valpass</strong></span> asig, krvt, xlpt, imaxlpt [, iskip] [, insmps]</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp50197824"></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="idp50200344"></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). Its output will begin to appear immediately.
</p>
</div>
<div class="refsect1" title="Examples">
<a id="idp50203384"></a>
<h2>Examples</h2>
<p>
Here is an example of the valpass opcode. It uses the file <a class="ulink" href="examples/valpass.csd" target="_top"><em class="citetitle">valpass.csd</em></a>.
</p>
<div class="example">
<a id="idp50204360"></a>
<p class="title">
<strong>Example 917. Example of the valpass 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>
-odac <span class="comment">;;;realtime audio out</span>
<span class="comment">;-iadc ;;;uncomment -iadc if realtime audio input is needed too</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o valpass.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> 44100
<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
krvt <span class="op">=</span> 1.5
klpt <span class="opc">line</span> p4, p3, p5
imaxlpt <span class="op">=</span> .1
a1 <span class="opc">diskin2</span> "fox.wav", 1
a1 <span class="opc">valpass</span> a1, krvt, klpt, imaxlpt
a2 <span class="opc">valpass</span> a1, krvt, klpt<span class="op">*</span>.5, imaxlpt
<span class="opc">outs</span> a1, a2
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">i</span> 1 0 5 .01 .2
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
</div>
<p><br class="example-break" />
</p>
<p>
Here is another example of the valpass opcode. It uses the file <a class="ulink" href="examples/valpass-2.csd" target="_top"><em class="citetitle">valpass-2.csd</em></a>.
</p>
<div class="example">
<a id="idp50207192"></a>
<p class="title">
<strong>Example 918. Second example of the valpass opcode.</strong>
</p>
<div class="example-contents">
<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>
-odac <span class="comment">;;;realtime audio out</span>
<span class="comment">;-iadc ;;;uncomment -iadc if realtime audio input is needed too</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o valpass-2.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> 44100
<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
giSine <span class="ohdr">ftgen</span> 0, 0, 65536, 10, 1 <span class="comment">;sine wave</span>
<span class="oblock">instr</span> 1
asig <span class="opc">diskin2</span> "beats.wav", 1, 0, 1
krvt <span class="opc">line</span> 0.01, p3, p3 <span class="comment">;reverb time</span>
adepth <span class="op">=</span> p4 <span class="comment">;sine depth </span>
krate <span class="op">=</span> 0.3 <span class="comment">;sine rate (speed)</span>
adel <span class="opc">oscil</span> 0.5, krate, giSine <span class="comment">;delay time oscillator (LFO)</span>
adel <span class="op">=</span> ((adel<span class="op">+</span>0.5)<span class="op">*</span>adepth) <span class="comment">;scale and offset LFO</span>
aout <span class="opc">valpass</span> asig, krvt, adel<span class="op">*</span>0.01, 0.5
<span class="opc">outs</span> aout, aout
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">i</span>1 0 10 1
<span class="stamnt">i</span>1 11 10 5
<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="See Also">
<a id="idp50208216"></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="vcomb.html" title="vcomb"><em class="citetitle">vcomb</em></a>
</p>
</div>
<div class="refsect1" title="Credits">
<a id="idp50210672"></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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