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<div class="refentry" title="deltap3">
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<h2>
<span class="refentrytitle">deltap3</span>
</h2>
<p>deltap —
Taps a delay line at variable offset times, uses cubic interpolation.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp17976000"></a>
<h2>Description</h2>
<p>
Taps a delay line at variable offset times, uses cubic interpolation.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp17976680"></a>
<h2>Syntax</h2>
<pre class="synopsis">ares <span class="command"><strong>deltap3</strong></span> xdlt</pre>
</div>
<div class="refsect1" title="Performance">
<a id="idp18011792"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>xdlt</em></span> -- specifies the tapped delay time in seconds. 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; the <span class="emphasis"><em>xdlt</em></span> argument in <span class="emphasis"><em>deltap3</em></span> implies that an audio-varying delay is permitted there.
</p>
<p>
<span class="emphasis"><em>deltap3</em></span> is experimental, and uses cubic interpolation. (New in Csound version 3.50.)
</p>
<p>
This opcode can tap into a <a class="link" href="delayr.html" title="delayr"><em class="citetitle">delayr</em></a>/<a class="link" href="delayw.html" title="delayw"><em class="citetitle">delayw</em></a> 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>
</div>
<div class="refsect1" title="Examples">
<a id="idp18019504"></a>
<h2>Examples</h2>
<p>
</p>
<div class="example">
<a id="idp18019952"></a>
<p class="title">
<strong>Example 167. deltap example #1</strong>
</p>
<div class="example-contents">
<pre class="programlisting">
asource <span class="opc">buzz</span> 1, 440, 20, 1
atime <span class="opc">linseg</span> 1, p3<span class="op">/</span>2,.01, p3<span class="op">/</span>2,1 <span class="comment">; trace a distance in secs</span>
ampfac <span class="op">=</span> 1<span class="op">/</span>atime<span class="op">/</span>atime <span class="comment">; and calc an amp factor</span>
adump <span class="opc">delayr</span> 1 <span class="comment">; set maximum distance</span>
amove <span class="opc">deltapi</span> atime <span class="comment">; move sound source past</span>
<span class="opc">delayw</span> asource <span class="comment">; the listener</span>
<span class="opc">out</span> amove <span class="op">*</span> ampfac</pre>
</div>
</div>
<p><br class="example-break" />
</p>
<p>
</p>
<div class="example">
<a id="idp18026880"></a>
<p class="title">
<strong>Example 168. deltap example #2</strong>
</p>
<div class="example-contents">
<pre class="programlisting">
ainput1 <span class="op">=</span> .....
ainput2 <span class="op">=</span> .....
kdlyt1 <span class="op">=</span> .....
kdlyt2 <span class="op">=</span> .....
<span class="comment">;Read delayed signal, first delayr instance:</span>
adump <span class="opc">delayr</span> 4.0
adly1 <span class="opc">deltap</span> kdlyt1 <span class="comment">; associated with first delayr instance</span>
<span class="comment">;Read delayed signal, second delayr instance:</span>
adump <span class="opc">delayr</span> 4.0
adly2 <span class="opc">deltap</span> kdlyt2 <span class="comment">; associated with second delayr instance</span>
<span class="comment">;Do some cross-coupled manipulation:</span>
afdbk1 <span class="op">=</span> 0.7 <span class="op">*</span> adly1 <span class="op">+</span> 0.7 <span class="op">*</span> adly2 <span class="op">+</span> ainput1
afdbk2 <span class="op">=</span> -0.7 <span class="op">*</span> adly1 <span class="op">+</span> 0.7 <span class="op">*</span> adly2 <span class="op">+</span> ainput2
<span class="comment">;Feed back signal, associated with first delayr instance:</span>
<span class="opc">delayw</span> afdbk1
<span class="comment">;Feed back signal, associated with second delayr instance:</span>
<span class="opc">delayw</span> afdbk2
<span class="opc">outs</span> adly1, adly2</pre>
</div>
</div>
<p><br class="example-break" />
</p>
<p>
Here is yet another example of the deltap3 opcode. It uses the file <a class="ulink" href="examples/deltap3.csd" target="_top"><em class="citetitle">deltap3.csd</em></a>.
</p>
<div class="example">
<a id="idp18038176"></a>
<p class="title">
<strong>Example 169. Example of the deltap3 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">deltap3</span> .4 <span class="comment">;first tap (on left channel)</span>
adelM <span class="opc">deltap3</span> 1 <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> 1, p3, .01 <span class="comment">;vary delay time</span>
adelR <span class="opc">deltap3</span> .65 <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>
</div>
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<p><br class="example-break" />
</p>
</div>
<div class="refsect1" title="See Also">
<a id="idp18040456"></a>
<h2>See Also</h2>
<p>
<a class="link" href="deltap.html" title="deltap"><em class="citetitle">deltap</em></a>,
<a class="link" href="deltapi.html" title="deltapi"><em class="citetitle">deltapi</em></a>,
<a class="link" href="deltapn.html" title="deltapn"><em class="citetitle">deltapn</em></a>
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