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<div class="refentry" title="linen">
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<a id="IndexLinen" class="indexterm"></a>
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<h2>
<span class="refentrytitle">linen</span>
</h2>
<p>linen —
Applies a straight line rise and decay pattern to an input amp signal.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp28271952"></a>
<h2>Description</h2>
<p>
<span class="emphasis"><em>linen</em></span> -- apply a straight line rise and decay pattern to an input amp signal.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp28272840"></a>
<h2>Syntax</h2>
<pre class="synopsis">ares <span class="command"><strong>linen</strong></span> xamp, irise, idur, idec</pre>
<pre class="synopsis">kres <span class="command"><strong>linen</strong></span> kamp, irise, idur, idec</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp28284008"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>irise</em></span> -- rise time in seconds. A zero or negative value signifies no rise modification.
</p>
<p>
<span class="emphasis"><em>idur</em></span> -- overall duration in seconds. A zero or negative value will cause initialization to be skipped.
</p>
<p>
<span class="emphasis"><em>idec</em></span> -- decay time in seconds. Zero means no decay. An <span class="emphasis"><em>idec</em></span> > <span class="emphasis"><em>idur</em></span> will cause a truncated decay.
</p>
</div>
<div class="refsect1" title="Performance">
<a id="idp28322152"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>kamp, xamp</em></span> -- input amplitude signal.
</p>
<p>
Rise modifications are applied for the first <span class="emphasis"><em>irise</em></span> seconds, and decay from time <span class="emphasis"><em>idur - idec</em></span>. If these periods are separated in time there will be a steady state during which <span class="emphasis"><em>amp</em></span> will be unmodified. If <span class="emphasis"><em>linen</em></span> rise and decay periods overlap then both modifications will be in effect for that time. If the overall duration <span class="emphasis"><em>idur</em></span> is exceeded in performance, the final decay will continue on in the same direction, going negative.
</p>
<p>
</p>
<div class="mediaobject">
<img src="images/linen.jpg" alt="[Envelope generated by the linen opcode]" />
<div class="caption">
<p>Envelope generated by the <span class="emphasis"><em>linen</em></span> opcode</p>
</div>
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<p>
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<p>
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<th align="left">Note</th>
</tr>
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<td align="left" valign="top">
<p>A common error with this opcode is to assume that the value of
0 is the held after the envelope has finished at
<span class="emphasis"><em>idur</em></span>. <span class="emphasis"><em>linen</em></span> does not
automatically end or stop at the end of the duration given.
If your note length is longer than <span class="emphasis"><em>idur</em></span>
seconds, <span class="emphasis"><em>kres</em></span> (or <span class="emphasis"><em>ares</em></span>)
will not come to rest at 0, but will instead continue to fall
with the same rate. If a decay and then hold is required then
the <a class="link" href="linseg.html" title="linseg"><em class="citetitle">linseg</em></a> opcode should be considered instead.
</p>
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<p>
</p>
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<div class="refsect1" title="Examples">
<a id="idp28329320"></a>
<h2>Examples</h2>
<p>
Here is an example of the linen opcode. It uses the file <a class="ulink" href="examples/linen.csd" target="_top"><em class="citetitle">linen.csd</em></a>.
</p>
<div class="example">
<a id="idp28330288"></a>
<p class="title">
<strong>Example 389. Example of the linen 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 linen.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
<span class="comment">; p4=amp</span>
<span class="comment">; p5=freq</span>
<span class="comment">; p6=attack time</span>
<span class="comment">; p7=release time</span>
ares <span class="opc">linen</span> p4, p6, p3, p7
asig <span class="opc">poscil</span> ares, p5, 1
<span class="opc">outs</span> asig, asig
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">f</span>1 0 4096 10 1 <span class="comment">; sine wave</span>
<span class="comment">;ins strt dur amp freq attack release</span>
<span class="stamnt">i</span>1 0 1 .5 440 0.5 0.7
<span class="stamnt">i</span>1 1.5 1 .2 440 0.9 0.1
<span class="stamnt">i</span>1 3 1 .2 880 0.02 0.99
<span class="stamnt">i</span>1 4.5 1 .2 880 0.7 0.01
<span class="stamnt">i</span>1 6 3 .7 220 0.5 0.5
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
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<p><br class="example-break" />
</p>
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<div class="refsect1" title="See Also">
<a id="idp28332560"></a>
<h2>See Also</h2>
<p>
<a class="link" href="envlpx.html" title="envlpx"><em class="citetitle">envlpx</em></a>,
<a class="link" href="envlpxr.html" title="envlpxr"><em class="citetitle">envlpxr</em></a>,
<a class="link" href="linenr.html" title="linenr"><em class="citetitle">linenr</em></a>
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