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<div class="refentry" title="expsegb">
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<h2>
<span class="refentrytitle">expsegb</span>
</h2>
<p>expsegb —
Trace a series of exponential segments between specified
absolute points.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp19698952"></a>
<h2>Description</h2>
<p>
Trace a series of exponential segments between specified
absolute points.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp19699640"></a>
<h2>Syntax</h2>
<pre class="synopsis">ares <span class="command"><strong>expsegb</strong></span> ia, itim1, ib [, itim2] [, ic] [...]</pre>
<pre class="synopsis">kres <span class="command"><strong>expsegb</strong></span> ia, itim1, ib [, itim2] [, ic] [...]</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp19710880"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>ia</em></span> -- starting value. Zero is illegal for exponentials.
</p>
<p>
<span class="emphasis"><em>ib, ic</em></span>, etc. -- value at <span class="emphasis"><em>tim1</em></span> seconds, etc. For exponentials, must be non-zero and must agree in sign with <span class="emphasis"><em>ia</em></span>.
</p>
<p>
<span class="emphasis"><em>itim1</em></span> -- time in seconds of end of first segment.
</p>
<p>
<span class="emphasis"><em>itim2, itim3</em></span>, etc. -- time in seconds of
subsequent ends of segments.
</p>
</div>
<div class="refsect1" title="Performance">
<a id="idp19713608"></a>
<h2>Performance</h2>
<p>
These units generate control or audio signals whose values can pass through 2 or more specified points. The last <span class="emphasis"><em>tim</em></span> value may or may not equal the instrument's performance time: a shorter performance will truncate the specified pattern, while a longer one will cause the last-defined segment to continue on in the same direction.
</p>
<p>
Note that the <span class="emphasis"><em>expsegb</em></span> opcode does not operate correctly at audio rate when segments are shorter than a k-period. Try the <a class="link" href="expsegba.html" title="expsegba"><em class="citetitle">expsegba</em></a> opcode instead.
</p>
</div>
<div class="refsect1" title="Examples">
<a id="idp19750672"></a>
<h2>Examples</h2>
<p>
Here is an example of the expsegb opcode. It uses the file <a class="ulink" href="examples/expsegb.csd" target="_top"><em class="citetitle">expsegb.csd</em></a>.
</p>
<div class="example">
<a id="idp19751648"></a>
<p class="title">
<strong>Example 220. Example of the expsegb 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>
<span class="comment">; Audio out Audio in</span>
-odac -iadc <span class="comment">;;;RT audio I/O</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o expseg.wav -W ;;; for file output any platform</span>
<span class="csdtag"></CsOptions></span>
<span class="csdtag"><CsInstruments></span>
<span class="comment">; Initialize the global variables.</span>
<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">kr</span> <span class="op">=</span> 4410
<span class="ohdr">ksmps</span> <span class="op">=</span> 10
<span class="ohdr">nchnls</span> <span class="op">=</span> 1
<span class="comment">; Instrument #1.</span>
<span class="oblock">instr</span> 1
<span class="comment">; p4 = frequency in pitch-class notation.</span>
kcps <span class="op">=</span> <span class="opc">cpspch</span>(p4)
<span class="comment">; Create an amplitude envelope.</span>
kenv expsegb 0.01, p3<span class="op">*</span>0.25, 1, p3, 0.01
kamp <span class="op">=</span> kenv <span class="op">*</span> 30000
a1 <span class="opc">oscil</span> kamp, kcps, 1
<span class="opc">out</span> a1
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="comment">; Table #1, a sine wave.</span>
<span class="stamnt">f</span> 1 0 16384 10 1
<span class="comment">; Play Instrument #1 for a half-second, p4=8.00</span>
<span class="stamnt">i</span> 1 0 0.5 8.00
<span class="comment">; Play Instrument #1 for a half-second, p4=8.01</span>
<span class="stamnt">i</span> 1 1 0.5 8.01
<span class="comment">; Play Instrument #1 for a half-second, p4=8.02</span>
<span class="stamnt">i</span> 1 2 0.5 8.02
<span class="comment">; Play Instrument #1 for a half-second, p4=8.03</span>
<span class="stamnt">i</span> 1 3 0.5 8.03
<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="See Also">
<a id="idp19753904"></a>
<h2>See Also</h2>
<p>
<a class="link" href="expon.html" title="expon"><em class="citetitle">expon</em></a>,
<a class="link" href="expseg.html" title="expseg"><em class="citetitle">expseg</em></a>,
<a class="link" href="expsega.html" title="expsega"><em class="citetitle">expsega</em></a>,
<a class="link" href="expsegr.html" title="expsegr"><em class="citetitle">expsegr</em></a>,
<a class="link" href="line.html" title="line"><em class="citetitle">line</em></a>,
<a class="link" href="linseg.html" title="linseg"><em class="citetitle">linseg</em></a>,
<a class="link" href="linsegr.html" title="linsegr"><em class="citetitle">linsegr</em></a>
<a class="link" href="transeg.html" title="transeg"><em class="citetitle">transeg</em></a>
</p>
</div>
<div class="refsect1" title="Credits">
<a id="idp19758264"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Victor Lazzarini</td>
</tr>
<tr>
<td>June 2011 </td>
</tr>
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<p>
</p>
<p>New in version 5.14</p>
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