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<div class="refentry" title="expsegba">
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<h2>
<span class="refentrytitle">expsegba</span>
</h2>
<p>expsegba —
An exponential segment generator operating at a-rate with
absolute times.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp19749424"></a>
<h2>Description</h2>
<p>
An exponential segment generator operating at a-rate. This unit
is almost identical to <a class="link" href="expsegb.html" title="expsegb"><em class="citetitle">expsegb</em></a>, but
more precise when defining segments with very short durations
(i.e., in a percussive attack phase) at audio rate.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp19737056"></a>
<h2>Syntax</h2>
<pre class="synopsis">ares <span class="command"><strong>expsegba</strong></span> ia, itim1, ib [, itim2] [, ic] [...]</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp19738200"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>ia</em></span> -- starting value. Zero is illegal.
</p>
<p>
<span class="emphasis"><em>ib</em></span>, <span class="emphasis"><em>ic</em></span>, etc. -- value after <span class="emphasis"><em>itim1</em></span> seconds, etc. 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 at end of first segment.
</p>
<p>
<span class="emphasis"><em>itim2</em></span>, <span class="emphasis"><em>itim3</em></span>, etc. --
time in seconds at the end of subsequent segments.
</p>
</div>
<div class="refsect1" title="Performance">
<a id="idp19787168"></a>
<h2>Performance</h2>
<p>
This unit generate audio signals whose values can pass through
two or more specified points. The final <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>
</div>
<div class="refsect1" title="Examples">
<a id="idp19788344"></a>
<h2>Examples</h2>
<p>
Here is an example of the expsegba opcode. It uses the file <a class="ulink" href="examples/expsegba.csd" target="_top"><em class="citetitle">expsegba.csd</em></a>.
</p>
<div class="example">
<a id="idp19789328"></a>
<p class="title">
<strong>Example 221. Example of the expsegba 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 No messages</span>
-odac -iadc -d <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 expsega.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">; Define a short percussive amplitude envelope that</span>
<span class="comment">; goes from 0.01 to 20,000 and back.</span>
aenv expsegba 0.01, 0.1, 20000, 0.2, 0.01
a1 <span class="opc">oscil</span> aenv, 440, 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 one second.</span>
<span class="stamnt">i</span> 1 0 1
<span class="comment">; Play Instrument #1 for one second.</span>
<span class="stamnt">i</span> 1 1 1
<span class="comment">; Play Instrument #1 for one second.</span>
<span class="stamnt">i</span> 1 2 1
<span class="comment">; Play Instrument #1 for one second.</span>
<span class="stamnt">i</span> 1 3 1
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
</div>
<p><br class="example-break" />
</p>
</div>
<div class="refsect1" title="See Also">
<a id="idp19791608"></a>
<h2>See Also</h2>
<p>
<a class="link" href="expsegb.html" title="expsegb"><em class="citetitle">expsegb</em></a>,
<a class="link" href="expsegr.html" title="expsegr"><em class="citetitle">expsegr</em></a>
</p>
</div>
<div class="refsect1" title="Credits">
<a id="idp19793104"></a>
<h2>Credits</h2>
<p>Author: John ffitch</p>
<p>June 2011</p>
<p>New in Csound 5.14</p>
</div>
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