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<h2>
<span class="refentrytitle">deltapn</span>
</h2>
<p>deltapn —
Taps a delay line at variable offset times.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp18119296"></a>
<h2>Description</h2>
<p>
Tap a delay line at variable offset times.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp18119952"></a>
<h2>Syntax</h2>
<pre class="synopsis">ares <span class="command"><strong>deltapn</strong></span> xnumsamps</pre>
</div>
<div class="refsect1" title="Performance">
<a id="idp18155056"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>xnumsamps</em></span> -- specifies the tapped delay time in number of samples. Each can range from 1 control period to the full delay time of the read/write pair; however, since there is no internal check for adherence to this range, the user is wholly responsible. Each argument can be a constant, a variable, or a time-varying signal.
</p>
<p>
<span class="emphasis"><em>deltapn</em></span> is identical to <a class="link" href="deltapi.html" title="deltapi"><em class="citetitle">deltapi</em></a>, except delay time is specified in number of samples, instead of seconds (Hans Mikelson).
</p>
<p>
This opcode can tap into a <span class="emphasis"><em>delayr</em></span>/<span class="emphasis"><em>delayw</em></span> pair, extracting delayed audio from the <span class="emphasis"><em>idlt</em></span> seconds of stored sound. There can be any number of <span class="emphasis"><em>deltap</em></span> and/or <span class="emphasis"><em>deltapi</em></span> units between a read/write pair. Each receives an audio tap with no change of original amplitude.
</p>
<p>
This opcode can provide multiple delay taps for arbitrary delay path and feedback networks. They can deliver either constant-time or time-varying taps, and are useful for building chorus effects, harmonizers, and Doppler shifts. Constant-time delay taps (and some slowly changing ones) do not need interpolated readout; they are well served by <span class="emphasis"><em>deltap</em></span>. Medium-paced or fast varying dlt's, however, will need the extra services of <span class="emphasis"><em>deltapi</em></span>.
</p>
<p>
<span class="emphasis"><em>delayr</em></span>/<span class="emphasis"><em>delayw</em></span> pairs may be interleaved. To associate a delay tap unit with a specific <span class="emphasis"><em>delayr</em></span> unit, it not only has to be located between that <span class="emphasis"><em>delayr</em></span> and the appropriate <span class="emphasis"><em>delayw</em></span> unit, but must also precede any following <span class="emphasis"><em>delayr</em></span> units. See Example 2. (This feature added in Csound version 3.57 by Jens Groh and John ffitch).
</p>
<p>
<span class="emphasis"><em>N.B.</em></span> k-rate delay times are not internally interpolated, but rather lay down stepped time-shifts of audio samples; this will be found quite adequate for slowly changing tap times. For medium to fast-paced changes, however, one should provide a higher resolution audio-rate timeshift as input.
</p>
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<div class="refsect1" title="Examples">
<a id="idp18162280"></a>
<h2>Examples</h2>
<p>
Here is an example of the deltapn opcode. It uses the file <a class="ulink" href="examples/deltapn.csd" target="_top"><em class="citetitle">deltapn.csd</em></a>.
</p>
<div class="example">
<a id="idp18163240"></a>
<p class="title">
<strong>Example 173. Example of the deltapn 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">;;;RT audio out</span>
<span class="comment">;-iadc ;;;uncomment -iadc if RT audio input is needed too</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o deltap3.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
gasig <span class="opc">init</span> 0
gidel <span class="op">=</span> 1 <span class="comment">;delay time in seconds</span>
<span class="oblock">instr</span> 1
ain <span class="opc">pluck</span> .7, 440, 1000, 0, 1
<span class="opc">outs</span> ain, ain
<span class="opc">vincr</span> gasig, ain <span class="comment">;send to global delay</span>
<span class="oblock">endin</span>
<span class="oblock">instr</span> 2
ifeedback <span class="op">=</span> p4
abuf2 <span class="opc">delayr</span> gidel
adelL <span class="opc">deltapn</span> 4000 <span class="comment">;first tap (on left channel)</span>
adelM <span class="opc">deltapn</span> 44100 <span class="comment">;second tap (on middle channel)</span>
<span class="opc">delayw</span> gasig <span class="op">+</span> (adelL <span class="op">*</span> ifeedback)
abuf3 <span class="opc">delayr</span> gidel
kdel <span class="opc">line</span> 100, p3, 1 <span class="comment">;vary delay time</span>
adelR <span class="opc">deltapn</span> 100 <span class="op">*</span> kdel <span class="comment">;one pitch changing tap (on the right chn.)</span>
<span class="opc">delayw</span> gasig <span class="op">+</span> (adelR <span class="op">*</span> ifeedback)
<span class="comment">;make a mix of all deayed signals </span>
<span class="opc">outs</span> adelL <span class="op">+</span> adelM, adelR <span class="op">+</span> adelM
<span class="opc">clear</span> gasig
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">i</span> 1 0 1
<span class="stamnt">i</span> 1 3 1
<span class="stamnt">i</span> 2 0 3 0 <span class="comment">;no feedback</span>
<span class="stamnt">i</span> 2 3 8 .8 <span class="comment">;lots of feedback</span>
<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="idp18165520"></a>
<h2>See Also</h2>
<p>
<a class="link" href="deltap.html" title="deltap"><em class="citetitle">deltap</em></a>,
<a class="link" href="deltap3.html" title="deltap3"><em class="citetitle">deltap3</em></a>,
<a class="link" href="deltapi.html" title="deltapi"><em class="citetitle">deltapi</em></a>
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