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<refentry id="jspline">
<indexterm id="IndexJspline"><primary>jspline</primary></indexterm>
<refentryinfo><title>Signal Generators:Linear and Exponential Generators</title></refentryinfo>
<refmeta>
<refentrytitle>jspline</refentrytitle>
</refmeta>
<refnamediv>
<refname>jspline</refname>
<refpurpose>
A jitter-spline generator.
</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<para>
A jitter-spline generator.
</para>
</refsect1>
<refsect1>
<title>Syntax</title>
<synopsis>ares <command>jspline</command> xamp, kcpsMin, kcpsMax</synopsis>
<synopsis>kres <command>jspline</command> kamp, kcpsMin, kcpsMax</synopsis>
</refsect1>
<refsect1>
<title>Performance</title>
<para>
<emphasis>kres, ares</emphasis> -- Output signal
</para>
<para>
<emphasis>xamp</emphasis> -- Amplitude factor
</para>
<para>
<emphasis>kcpsMin, kcpsMax</emphasis> -- Range of point-generation rate. Min and max limits are expressed in cps.
</para>
<para>
<emphasis>jspline</emphasis> (jitter-spline generator) generates a smooth curve based on random points generated at [<emphasis>cpsMin</emphasis>, <emphasis>cpsMax</emphasis>] rate. This opcode is similar to <link linkend="randomi"><citetitle>randomi</citetitle></link> or <link linkend="randi"><citetitle>randi</citetitle></link> or <link linkend="jitter"><citetitle>jitter</citetitle></link>, but segments are not straight lines, but cubic spline curves. Output value range is approximately > -<emphasis>xamp</emphasis> and < <emphasis>xamp</emphasis>. Actually, real range could be a bit greater, because of interpolating curves beetween each pair of random-points.
</para>
<para>
At present time generated curves are quite smooth when <emphasis>cpsMin</emphasis> is not too different from <emphasis>cpsMax</emphasis>. When <emphasis>cpsMin</emphasis>-<emphasis>cpsMax</emphasis> interval is big, some little discontinuity could occurr, but it should not be a problem, in most cases. Maybe the algorithm will be improved in next versions.
</para>
<para>
These opcodes are often better than <link linkend="jitter"><citetitle>jitter</citetitle></link> when user wants to <quote>naturalize</quote> or <quote>analogize</quote> digital sounds. They could be used also in algorithmic composition, to generate smooth random melodic lines when used together with <link linkend="samphold"><citetitle>samphold</citetitle></link> opcode.
</para>
<para>
Note that the result is quite different from the one obtained by filtering white noise, and they allow the user to obtain a much more precise control.
</para>
</refsect1>
<refsect1>
<title>Credits</title>
<para>Author: &namegabriel;</para>
<para>New in Version 4.15</para>
</refsect1>
</refentry>
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