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<refentry id="deltapxw">
<indexterm id="IndexDeltapxw"><primary>deltapxw</primary></indexterm>
<refentryinfo><title>Signal Modifiers:Delay</title></refentryinfo>
<refmeta>
<refentrytitle>deltapxw</refentrytitle>
</refmeta>
<refnamediv>
<refname>deltapxw</refname>
<refpurpose>
Mixes the input signal to a delay line.
</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<para>
<emphasis>deltapxw</emphasis> mixes the input signal to a delay line. This opcode can be mixed with reading units (<link linkend="deltap"><citetitle>deltap</citetitle></link>, <link linkend="deltapn"><citetitle>deltapn</citetitle></link>, <link linkend="deltapi"><citetitle>deltapi</citetitle></link>, <link linkend="deltap3"><citetitle>deltap3</citetitle></link>, and <link linkend="deltapx"><citetitle>deltapx</citetitle></link>) 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 <link linkend="delayr"><citetitle>delayr</citetitle></link>/<link linkend="delayw"><citetitle>delayw</citetitle></link> delay line with interpolation.
</para>
</refsect1>
<refsect1>
<title>Syntax</title>
<synopsis><command>deltapxw</command> ain, adel, iwsize</synopsis>
</refsect1>
<refsect1>
<title>Initialization</title>
<para>
<emphasis>iwsize</emphasis> -- interpolation window size in samples. Allowed values are integer multiplies of 4 in the range 4 to 1024. iwsize = 4 uses cubic interpolation. Increasing iwsize improves sound quality at the expense of CPU usage, and minimum delay time.
</para>
</refsect1>
<refsect1>
<title>Performance</title>
<para>
<emphasis>ain</emphasis> -- Input signal
</para>
<para>
<emphasis>adel</emphasis> -- Delay time in seconds.
</para>
<para>
<informalexample>
<programlisting>
a1 delayr idlr
deltapxw a2, adl1, iws1
a3 deltapx adl2, iws2
deltapxw a4, adl3, iws3
delayw a5
</programlisting>
</informalexample>
</para>
<para>
Minimum and maximum delay times:
<informalexample>
<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)
</programlisting>
</informalexample>
</para>
<note>
<title>Note</title>
<para>
Window sizes for opcodes other than deltapx are: deltap, deltapn: 1, deltapi: 2 (linear), deltap3: 4 (cubic)
</para>
</note>
</refsect1>
<refsect1>
<title>Examples</title>
<para>
<informalexample>
<programlisting>
a1 phasor 300.0
a1 = a1 - 0.5
a_ delayr 1.0
adel phasor 4.0
adel = sin (2.0 * 3.14159265 * adel) * 0.01 + 0.2
deltapxw a1, adel, 32
adel phasor 2.0
adel = sin (2.0 * 3.14159265 * adel) * 0.01 + 0.2
deltapxw a1, adel, 32
adel = 0.3
a2 deltapx adel, 32
a1 = 0
delayw a1
out a2 * 20000.0
</programlisting>
</informalexample>
</para>
</refsect1>
<refsect1>
<title>See Also</title>
<para>
<link linkend="deltapx"><citetitle>deltapx</citetitle></link>
</para>
</refsect1>
<refsect1>
<title>Credits</title>
<para>
<simplelist>
<member>Author: &nameistvan;</member>
<member>August 2001</member>
</simplelist>
</para>
<para>New in version 4.13</para>
</refsect1>
</refentry>
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