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<h2>
<span class="refentrytitle">deltapxw</span>
</h2>
<p>deltapxw —
Mixes the input signal to a delay line.
</p>
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<div class="refsect1">
<a id="idm281472941909736"></a>
<h2>Description</h2>
<p>
<span class="emphasis"><em>deltapxw</em></span> mixes the input signal to a delay line. This opcode can be mixed with reading units (<a class="link" href="deltap.html" title="deltap"><em class="citetitle">deltap</em></a>, <a class="link" href="deltapn.html" title="deltapn"><em class="citetitle">deltapn</em></a>, <a class="link" href="deltapi.html" title="deltapi"><em class="citetitle">deltapi</em></a>, <a class="link" href="deltap3.html" title="deltap3"><em class="citetitle">deltap3</em></a>, and <a class="link" href="deltapx.html" title="deltapx"><em class="citetitle">deltapx</em></a>) in any order; the actual delay time is the difference of the read and write time. This opcode can read from and write to 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> delay line with interpolation.
</p>
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<div class="refsect1">
<a id="idm281472941860376"></a>
<h2>Syntax</h2>
<pre class="synopsis"><span class="command"><strong>deltapxw</strong></span> ain, adel, iwsize</pre>
</div>
<div class="refsect1">
<a id="idm281472941858328"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>iwsize</em></span> -- interpolation window size in samples. Allowed values are integer multiplies of 4 in the range 4 to 1024. <span class="emphasis"><em>iwsize</em></span> = 4 uses cubic interpolation. Increasing <span class="emphasis"><em>iwsize</em></span> improves sound quality at the expense of CPU usage, and minimum delay time.
</p>
</div>
<div class="refsect1">
<a id="idm281472941855608"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>ain</em></span> -- Input signal.
</p>
<p>
<span class="emphasis"><em>adel</em></span> -- Delay time in seconds.
</p>
<p>
</p>
<div class="informalexample">
<pre class="programlisting">
a1 <span class="opc">delayr</span> idlr
<span class="opc">deltapxw</span> a2, adl1, iws1
a3 <span class="opc">deltapx</span> adl2, iws2
<span class="opc">deltapxw</span> a4, adl3, iws3
<span class="opc">delayw</span> a5</pre>
</div>
<p>
</p>
<p>
Minimum and maximum delay times:
</p>
<div class="informalexample">
<pre class="programlisting">
idlr >= 1/kr Delay line length
adl1 >= (iws1/2)/sr Write before read
adl1 <= idlr - (1 + iws1/2)/sr (allows shorter delays)
adl2 >= 1/kr + (iws2/2)/sr Read time
adl2 <= idlr - (1 + iws2/2)/sr
adl2 >= adl1 + (iws1 + iws2) / (2*sr)
adl2 >= 1/kr + adl3 + (iws2 + iws3) / (2*sr)
adl3 >= (iws3/2)/sr Write after read
adl3 <= idlr - (1 + iws3/2)/sr (allows feedback)
</pre>
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<p>
</p>
<div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
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<td rowspan="2" align="center" valign="top" width="25">
<img alt="[Note]" src="images/note.png" />
</td>
<th align="left">Note</th>
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<td align="left" valign="top">
<p>
Window sizes for opcodes other than <span class="emphasis"><em>deltapx</em></span> are: <span class="emphasis"><em>deltap</em></span>, <span class="emphasis"><em>deltapn</em></span>: 1, <span class="emphasis"><em>deltapi</em></span>: 2 (linear), <span class="emphasis"><em>deltap3</em></span>: 4 (cubic)
</p>
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</table>
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<div class="refsect1">
<a id="idm281472941842232"></a>
<h2>Examples</h2>
<p>
Here is an example of the deltapxw opcode. It uses the file <a class="ulink" href="examples/deltapxw.csd" target="_top"><em class="citetitle">deltapxw.csd</em></a>.
</p>
<div class="example">
<a id="idm281472941840456"></a>
<p class="title">
<strong>Example 207. Example of the deltapxw 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="idm281472774763432"></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">;;;RT audio out</span>
<span class="c1">;-iadc ;;;uncomment -iadc if RT audio input is needed too</span>
<span class="c1">; For Non-realtime ouput leave only the line below:</span>
<span class="c1">; -o deltapxw.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>
a<span class="n">1</span> <span class="nb">phasor</span> <span class="mi">300</span>
a<span class="n">1</span> <span class="o">=</span> a<span class="n">1</span> <span class="o">-</span> <span class="mf">0.5</span>
a<span class="n">_</span> <span class="nb">delayr</span> <span class="mi">1</span>
a<span class="n">del</span> <span class="nb">phasor</span> <span class="mi">4</span>
a<span class="n">del</span> <span class="o">=</span> <span class="nb">sin</span><span class="p">(</span><span class="mi">2</span> <span class="o">*</span> <span class="mf">3.14159265</span> <span class="o">*</span> a<span class="n">del</span><span class="p">)</span> <span class="o">*</span> <span class="mf">0.01</span> <span class="o">+</span> <span class="mf">0.2</span>
<span class="nb">deltapxw</span> a<span class="n">1</span><span class="p">,</span> a<span class="n">del</span><span class="p">,</span> <span class="mi">32</span>
a<span class="n">del</span> <span class="nb">phasor</span> <span class="mi">2</span>
a<span class="n">del</span> <span class="o">=</span> <span class="nb">sin</span><span class="p">(</span><span class="mi">2</span> <span class="o">*</span> <span class="mf">3.14159265</span> <span class="o">*</span> a<span class="n">del</span><span class="p">)</span> <span class="o">*</span> <span class="mf">0.01</span> <span class="o">+</span> <span class="mf">0.2</span>
<span class="nb">deltapxw</span> a<span class="n">1</span><span class="p">,</span> a<span class="n">del</span><span class="p">,</span> <span class="mi">32</span>
a<span class="n">del</span> <span class="o">=</span> <span class="mf">0.3</span>
a<span class="n">2</span> <span class="nb">deltapx</span> a<span class="n">del</span><span class="p">,</span> <span class="mi">32</span>
a<span class="n">1</span> <span class="o">=</span> <span class="mi">0</span>
<span class="nb">delayw</span> a<span class="n">1</span>
<span class="nb">outs</span> a<span class="n">2</span><span class="o">*</span><span class="mf">.7</span><span class="p">,</span> a<span class="n">2</span><span class="o">*</span><span class="mf">.7</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="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="idm281472941836168"></a>
<h2>See Also</h2>
<p>
<a class="link" href="deltapx.html" title="deltapx"><em class="citetitle">deltapx</em></a>
</p>
</div>
<div class="refsect1">
<a id="idm281472941834120"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Istvan Varga</td>
</tr>
<tr>
<td>August 2001</td>
</tr>
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<p>
</p>
<p>New in version 4.13</p>
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