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<div class="refentry" title="deltapx">
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<h2>
<span class="refentrytitle">deltapx</span>
</h2>
<p>deltapx —
Read from or write to a delay line with interpolation.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp18138264"></a>
<h2>Description</h2>
<p>
<span class="emphasis"><em>deltapx</em></span> is similar to <a class="link" href="deltapi.html" title="deltapi"><em class="citetitle">deltapi</em></a> or <a class="link" href="deltap3.html" title="deltap3"><em class="citetitle">deltap3</em></a>. However, it allows higher quality interpolation. This opcode can read from and write to a <span class="emphasis"><em>delayr/delayw</em></span> delay line with interpolation.
</p>
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<div class="refsect1" title="Syntax">
<a id="idp18149712"></a>
<h2>Syntax</h2>
<pre class="synopsis">aout <span class="command"><strong>deltapx</strong></span> adel, iwsize</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp18150832"></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>
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<div class="refsect1" title="Performance">
<a id="idp18152312"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>aout</em></span> -- Output 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" title="Note" style="margin-left: 0.5in; margin-right: 0.5in;">
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<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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<div class="refsect1" title="Examples">
<a id="idp18198880"></a>
<h2>Examples</h2>
<p>
Here is an example of the deltapx opcode. It uses the file <a class="ulink" href="examples/deltapx.csd" target="_top"><em class="citetitle">deltapx.csd</em></a>.
</p>
<div class="example">
<a id="idp18199856"></a>
<p class="title">
<strong>Example 174. Example of the deltapx 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 deltapx.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
a1 <span class="opc">phasor</span> 300
a1 <span class="op">=</span> a1 <span class="op">-</span> 0.5
a_ <span class="opc">delayr</span> 1
adel <span class="opc">phasor</span> 4
adel <span class="op">=</span> <span class="opc">sin</span> (2 <span class="op">*</span> 3.14159265 <span class="op">*</span> adel) <span class="op">*</span> 0.01 <span class="op">+</span> 0.2
<span class="opc">deltapxw</span> a1, adel, 32
adel <span class="opc">phasor</span> 2
adel <span class="op">=</span> <span class="opc">sin</span> (2 <span class="op">*</span> 3.14159265 <span class="op">*</span> adel) <span class="op">*</span> 0.01 <span class="op">+</span> 0.2
<span class="opc">deltapxw</span> a1, adel, 32
adel <span class="op">=</span> 0.3
a2 <span class="opc">deltapx</span> adel, 32
a1 <span class="op">=</span> 0
<span class="opc">delayw</span> a1
<span class="opc">outs</span> a2<span class="op">*</span>.7, a2<span class="op">*</span>.7
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">i</span>1 0 5
<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="idp18202136"></a>
<h2>See Also</h2>
<p>
<a class="link" href="deltapxw.html" title="deltapxw"><em class="citetitle">deltapxw</em></a>
</p>
</div>
<div class="refsect1" title="Credits">
<a id="idp18203152"></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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