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<div class="refentry" title="GENtanh">
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<h2>
<span class="refentrytitle">GENtanh</span>
</h2>
<p>"tanh" —
Generate a table with values on the tanh function.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp78534984"></a>
<h2>Description</h2>
<p>
Creates an ftable with values of the tanh function.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp78535648"></a>
<h2>Syntax</h2>
<pre class="synopsis"><span class="command"><strong>f</strong></span> # time size "tanh" start end rescale</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp78546224"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>size</em></span> -- number of points in the table. Must
be a power of 2 or power-of-2 plus 1 (see <a class="link" href="f.html" title="f Statement (or Function Table Statement)"><em class="citetitle">f statement</em></a>).
</p>
<p>
<span class="emphasis"><em>start, end</em></span> -- first and last value to be stored; the GEN draws a curve that goes from start to end: tanh(start) .... tanh(end). The points stored are uniformly spaced between these to the table size
</p>
<p>
<span class="emphasis"><em>rescale</em></span> -- if not zero the table is not rescaled
</p>
</div>
<div class="refsect1" title="Examples">
<a id="idp78583088"></a>
<h2>Examples</h2>
<p>
Here is a simple example of the GENtanh routine. It uses the file <a class="ulink" href="examples/gentanh.csd" target="_top"><em class="citetitle">gentanh.csd</em></a>.
</p>
<div class="example">
<a id="idp78584048"></a>
<p class="title">
<strong>Example 1073. Example of the GENtanh routine.</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 gentanh.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
aswp <span class="opc">linseg</span> 0.01, p3<span class="op">*</span>.5, .49, p3<span class="op">*</span>.5, 0.01 <span class="comment">;index sweep function</span>
aindex <span class="opc">poscil</span> aswp, 110, 1 <span class="comment">;sound to waveshape</span>
atable <span class="opc">tablei</span> aindex, p4, 1, .5 <span class="comment">;waveshape index</span>
aenv <span class="opc">linen</span> 0.8, .01, p3, .02 <span class="comment">;amplitude envelope</span>
asig <span class="op">=</span> (atable<span class="op">*</span>aenv)<span class="op">*</span>p5 <span class="comment">;impose envelope and scale</span>
asig <span class="opc">dcblock2</span> asig <span class="comment">;get rid of DC</span>
<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 8192 10 1 <span class="comment">;sine wave</span>
<span class="stamnt">f</span> 2 0 8192 "tanh" -100 100 0 <span class="comment">;symmetrical transfer fuction</span>
<span class="stamnt">f</span> 3 0 8192 "tanh" -10 10 0 <span class="comment">;symmetrical</span>
<span class="stamnt">f</span> 4 0 8192 "tanh" 0 10 0 <span class="comment">;not symmetrical</span>
<span class="stamnt">i</span>1 0 3 2 1
<span class="stamnt">i</span>1 + 3 3 1
<span class="stamnt">i</span>1 + 3 4 2
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
</div>
<p><br class="example-break" />
<span>These are the diagrams of the waveforms of the GENtanh routines, as used in the example:</span>
</p>
<div class="mediaobject">
<img src="images/gentanh_1.png" alt="f 2 0 8192 "tanh" -100 100 0 - lots of distortion" />
<div class="caption">
<p> f 2 0 8192 "tanh" -100 100 0 - lots of distortion</p>
</div>
</div>
<p>
</p>
<div class="mediaobject">
<img src="images/gentanh_2.png" alt="f 3 0 8192 "tanh" -10 10 0 - less distortion than f2" />
<div class="caption">
<p> f 3 0 8192 "tanh" -10 10 0 - less distortion than f2</p>
</div>
</div>
<p>
</p>
<div class="mediaobject">
<img src="images/gentanh_3.png" alt="f 4 0 8192 "tanh" -10 15 0" />
<div class="caption">
<p> f 4 0 8192 "tanh" -10 15 0</p>
</div>
</div>
<p>
</p>
</div>
<div class="refsect1" title="See Also">
<a id="idp78591784"></a>
<h2>See Also</h2>
<p>
<a class="link" href="GENexp.html" title="GENexp"><em class="citetitle">GENexp</em></a> and
<a class="link" href="GENsone.html" title="GENsone"><em class="citetitle">GENsone</em></a>.
</p>
<p> More information on this routine: <a class="ulink" href="http://www.csounds.com/journal/issue11/distortionSynthesis.html" target="_top"><em class="citetitle">http://www.csounds.com/journal/issue11/distortionSynthesis</em></a>, written by Victor Lazzarini</p>
<p>
</p>
</div>
<div class="refsect1" title="Credits">
<a id="idp78594096"></a>
<h2>Credits</h2>
<p>Written by John ffitch</p>
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