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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">
<a id="idm281472876172296"></a>
<h2>Description</h2>
<p>
Variably reverberates an input signal with a flat frequency response.
</p>
</div>
<div class="refsect1">
<a id="idm281472876108632"></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">
<a id="idm281472876106456"></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="idm281472876101720"></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">
<a id="idm281472876096152"></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="idm281472876094296"></a>
<p class="title">
<strong>Example 1048. 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>
<div class="refsect1">
<a id="idm281472696265928"></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>
-odac <span class="c1">;;;realtime audio out</span>
<span class="c1">;-iadc ;;;uncomment -iadc if realtime audio input is needed too</span>
<span class="c1">; For Non-realtime ouput leave only the line below:</span>
<span class="c1">; -o valpass.wav -W ;;; for file output any platform</span>
<span class="nt"></CsOptions></span>
<span class="nt"><CsInstruments></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">32</span>
<span class="vg">nchnls</span> <span class="o">=</span> <span class="mi">2</span>
<span class="vg">0dbfs</span> <span class="o">=</span> <span class="mi">1</span>
<span class="kd">instr</span> <span class="nf">1</span>
k<span class="n">rvt</span> <span class="o">=</span> <span class="mf">1.5</span>
k<span class="n">lpt</span> <span class="nb">line</span> <span class="nb">p4</span><span class="p">,</span> <span class="nb">p3</span><span class="p">,</span> <span class="nb">p5</span>
i<span class="n">maxlpt</span> <span class="o">=</span> <span class="mf">.1</span>
a<span class="n">1</span> <span class="nb">diskin2</span> <span class="s">"fox.wav"</span><span class="p">,</span> <span class="mi">1</span>
a<span class="n">1</span> <span class="nb">valpass</span> a<span class="n">1</span><span class="p">,</span> k<span class="n">rvt</span><span class="p">,</span> k<span class="n">lpt</span><span class="p">,</span> i<span class="n">maxlpt</span>
a<span class="n">2</span> <span class="nb">valpass</span> a<span class="n">1</span><span class="p">,</span> k<span class="n">rvt</span><span class="p">,</span> k<span class="n">lpt</span><span class="o">*</span><span class="mf">.5</span><span class="p">,</span> i<span class="n">maxlpt</span>
<span class="nb">outs</span> a<span class="n">1</span><span class="p">,</span> a<span class="n">2</span>
<span class="kd">endin</span>
<span class="nt"></CsInstruments></span>
<span class="nt"><CsScore></span>
<span class="nb">i</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mi">5</span> <span class="mf">.01</span> <span class="mf">.2</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>
<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="idm281472876089016"></a>
<p class="title">
<strong>Example 1049. Second example of the valpass opcode.</strong>
</p>
<div class="example-contents">
<div class="refsect1">
<a id="idm281472696285080"></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>
-odac <span class="c1">;;;realtime audio out</span>
<span class="c1">;-iadc ;;;uncomment -iadc if realtime audio input is needed too</span>
<span class="c1">; For Non-realtime ouput leave only the line below:</span>
<span class="c1">; -o valpass-2.wav -W ;;; for file output any platform</span>
<span class="nt"></CsOptions></span>
<span class="nt"><CsInstruments></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">32</span>
<span class="vg">nchnls</span> <span class="o">=</span> <span class="mi">2</span>
<span class="vg">0dbfs</span> <span class="o">=</span> <span class="mi">1</span>
gi<span class="n">Sine</span> <span class="nb">ftgen</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">65536</span><span class="p">,</span> <span class="mi">10</span><span class="p">,</span> <span class="mi">1</span> <span class="c1">;sine wave</span>
<span class="kd">instr</span> <span class="nf">1</span>
a<span class="n">sig</span> <span class="nb">diskin2</span> <span class="s">"beats.wav"</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">1</span>
k<span class="n">rvt</span> <span class="nb">line</span> <span class="mf">0.01</span><span class="p">,</span> <span class="nb">p3</span><span class="p">,</span> <span class="nb">p3</span> <span class="c1">;reverb time</span>
a<span class="n">depth</span> <span class="o">=</span> <span class="nb">p4</span> <span class="c1">;sine depth </span>
k<span class="n">rate</span> <span class="o">=</span> <span class="mf">0.3</span> <span class="c1">;sine rate (speed)</span>
a<span class="n">del</span> <span class="nb">oscil</span> <span class="mf">0.5</span><span class="p">,</span> k<span class="n">rate</span><span class="p">,</span> gi<span class="n">Sine</span> <span class="c1">;delay time oscillator (LFO)</span>
a<span class="n">del</span> <span class="o">=</span> <span class="p">((</span>a<span class="n">del</span><span class="o">+</span><span class="mf">0.5</span><span class="p">)</span><span class="o">*</span>a<span class="n">depth</span><span class="p">)</span> <span class="c1">;scale and offset LFO</span>
a<span class="n">out</span> <span class="nb">valpass</span> a<span class="n">sig</span><span class="p">,</span> k<span class="n">rvt</span><span class="p">,</span> a<span class="n">del</span><span class="o">*</span><span class="mf">0.01</span><span class="p">,</span> <span class="mf">0.5</span>
<span class="nb">outs</span> a<span class="n">out</span><span class="p">,</span> a<span class="n">out</span>
<span class="kd">endin</span>
<span class="nt"></CsInstruments></span>
<span class="nt"><CsScore></span>
<span class="nb">i</span><span class="mi">1</span> <span class="mi">0</span> <span class="mi">10</span> <span class="mi">1</span>
<span class="nb">i</span><span class="mi">1</span> <span class="mi">11</span> <span class="mi">10</span> <span class="mi">5</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="idm281472876087096"></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">
<a id="idm281472876082168"></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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