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<div class="refentry" title="jspline">
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<h2>
<span class="refentrytitle">jspline</span>
</h2>
<p>jspline —
A jitter-spline generator.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp28021296"></a>
<h2>Description</h2>
<p>
A jitter-spline generator.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp28059672"></a>
<h2>Syntax</h2>
<pre class="synopsis">ares <span class="command"><strong>jspline</strong></span> xamp, kcpsMin, kcpsMax</pre>
<pre class="synopsis">kres <span class="command"><strong>jspline</strong></span> kamp, kcpsMin, kcpsMax</pre>
</div>
<div class="refsect1" title="Performance">
<a id="idp28061408"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>kres, ares</em></span> -- Output signal
</p>
<p>
<span class="emphasis"><em>xamp</em></span> -- Amplitude factor
</p>
<p>
<span class="emphasis"><em>kcpsMin, kcpsMax</em></span> -- Range of point-generation rate. Min and max limits are expressed in cps.
</p>
<p>
<span class="emphasis"><em>jspline</em></span> (jitter-spline generator) generates a smooth curve based on random points generated at [<span class="emphasis"><em>cpsMin</em></span>, <span class="emphasis"><em>cpsMax</em></span>] rate. This opcode is similar to <a class="link" href="randomi.html" title="randomi"><em class="citetitle">randomi</em></a> or <a class="link" href="randi.html" title="randi"><em class="citetitle">randi</em></a> or <a class="link" href="jitter.html" title="jitter"><em class="citetitle">jitter</em></a>, but segments are not straight lines, but cubic spline curves. Output value range is approximately > -<span class="emphasis"><em>xamp</em></span> and < <span class="emphasis"><em>xamp</em></span>. Actually, real range could be a bit greater, because of interpolating curves beetween each pair of random-points.
</p>
<p>
At present time generated curves are quite smooth when <span class="emphasis"><em>cpsMin</em></span> is not too different from <span class="emphasis"><em>cpsMax</em></span>. When <span class="emphasis"><em>cpsMin</em></span>-<span class="emphasis"><em>cpsMax</em></span> 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.
</p>
<p>
These opcodes are often better than <a class="link" href="jitter.html" title="jitter"><em class="citetitle">jitter</em></a> when user wants to <span class="quote">“<span class="quote">naturalize</span>”</span> or <span class="quote">“<span class="quote">analogize</span>”</span> digital sounds. They could be used also in algorithmic composition, to generate smooth random melodic lines when used together with <a class="link" href="samphold.html" title="samphold"><em class="citetitle">samphold</em></a> opcode.
</p>
<p>
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.
</p>
</div>
<div class="refsect1" title="Examples">
<a id="idp28069800"></a>
<h2>Examples</h2>
<p>
Here is an example of the jspline opcode. It uses the file <a class="ulink" href="examples/jspline.csd" target="_top"><em class="citetitle">jspline.csd</em></a>.
</p>
<div class="example">
<a id="idp28070776"></a>
<p class="title">
<strong>Example 384. Example of the jspline 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">;;;realtime audio out</span>
<span class="comment">;-iadc ;;;uncomment -iadc if realtime audio input is needed too</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o jspline.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
kamp <span class="opc">init</span> p4
kcpsmin <span class="opc">init</span> 2
kcpsmax <span class="opc">init</span> 20
ksp <span class="opc">jspline</span> kamp, kcpsmin, kcpsmax
aout <span class="opc">pluck</span> 1, 200<span class="op">+</span>ksp, 1000, 0, 1
aout <span class="opc">dcblock</span> aout <span class="comment">;remove DC</span>
<span class="opc">outs</span> aout, aout
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">i</span> 1 0 10 2 <span class="comment">;a bit jitter</span>
<span class="stamnt">i</span> 1 8 10 10 <span class="comment">;some more</span>
<span class="stamnt">i</span> 1 16 10 20 <span class="comment">;lots more</span>
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
</div>
<p><br class="example-break" />
</p>
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<div class="refsect1" title="Credits">
<a id="idp28073056"></a>
<h2>Credits</h2>
<p>Author: Gabriel Maldonado</p>
<p>New in Version 4.15</p>
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