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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">
<a id="idm281472817928728"></a>
<h2>Description</h2>
<p>
Creates an ftable with values of the tanh function.
</p>
</div>
<div class="refsect1">
<a id="idm281472817927544"></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">
<a id="idm281472817871384"></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">
<a id="idm281472817866872"></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="idm281472817865096"></a>
<p class="title">
<strong>Example 1219. 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>
<div class="refsect1">
<a id="idm281472678682632"></a>
<pre class="programlisting">
<span class="nt"><CsoundSynthesizer></span>
<span class="nt"><CsOptions></span>
<span class="c1">; Select audio/midi flags here according to platform</span>
-odac <span class="c1">;;;realtime audio out</span>
<span class="c1">;-iadc ;;;uncomment -iadc if realtime audio input is needed too</span>
<span class="c1">; For Non-realtime ouput leave only the line below:</span>
<span class="c1">; -o gentanh.wav -W ;;; for file output any platform</span>
<span class="nt"></CsOptions></span>
<span class="nt"><CsInstruments></span>
<span class="vg">sr</span> <span class="o">=</span> <span class="mi">44100</span>
<span class="vg">ksmps</span> <span class="o">=</span> <span class="mi">32</span>
<span class="vg">nchnls</span> <span class="o">=</span> <span class="mi">2</span>
<span class="vg">0dbfs</span> <span class="o">=</span> <span class="mi">1</span>
<span class="kd">instr</span> <span class="nf">1</span>
a<span class="n">swp</span> <span class="nb">linseg</span> <span class="mf">0.01</span><span class="p">,</span> <span class="nb">p3</span><span class="o">*</span><span class="mf">.5</span><span class="p">,</span> <span class="mf">.49</span><span class="p">,</span> <span class="nb">p3</span><span class="o">*</span><span class="mf">.5</span><span class="p">,</span> <span class="mf">0.01</span> <span class="c1">;index sweep function</span>
a<span class="n">index</span> <span class="nb">poscil</span> a<span class="n">swp</span><span class="p">,</span> <span class="mi">110</span><span class="p">,</span> <span class="mi">1</span> <span class="c1">;sound to waveshape</span>
a<span class="n">table</span> <span class="nb">tablei</span> a<span class="n">index</span><span class="p">,</span> <span class="nb">p4</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mf">.5</span> <span class="c1">;waveshape index</span>
a<span class="n">env</span> <span class="nb">linen</span> <span class="mf">0.8</span><span class="p">,</span> <span class="mf">.01</span><span class="p">,</span> <span class="nb">p3</span><span class="p">,</span> <span class="mf">.02</span> <span class="c1">;amplitude envelope</span>
a<span class="n">sig</span> <span class="o">=</span> <span class="p">(</span>a<span class="n">table</span><span class="o">*</span>a<span class="n">env</span><span class="p">)</span><span class="o">*</span><span class="nb">p5</span> <span class="c1">;impose envelope and scale</span>
a<span class="n">sig</span> <span class="nb">dcblock2</span> a<span class="n">sig</span> <span class="c1">;get rid of DC</span>
<span class="nb">outs</span> a<span class="n">sig</span><span class="p">,</span> a<span class="n">sig</span>
<span class="kd">endin</span>
<span class="nt"></CsInstruments></span>
<span class="nt"><CsScore></span>
<span class="nb">f</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mi">8192</span> <span class="mi">10</span> <span class="mi">1</span> <span class="c1">;sine wave</span>
<span class="nb">f</span> <span class="mi">2</span> <span class="mi">0</span> <span class="mi">8192</span> <span class="s">"tanh"</span> <span class="o">-</span><span class="mi">100</span> <span class="mi">100</span> <span class="mi">0</span> <span class="c1">;symmetrical transfer fuction</span>
<span class="nb">f</span> <span class="mi">3</span> <span class="mi">0</span> <span class="mi">8192</span> <span class="s">"tanh"</span> <span class="o">-</span><span class="mi">10</span> <span class="mi">10</span> <span class="mi">0</span> <span class="c1">;symmetrical</span>
<span class="nb">f</span> <span class="mi">4</span> <span class="mi">0</span> <span class="mi">8192</span> <span class="s">"tanh"</span> <span class="mi">0</span> <span class="mi">10</span> <span class="mi">0</span> <span class="c1">;not symmetrical</span>
<span class="nb">i</span><span class="mi">1</span> <span class="mi">0</span> <span class="mi">3</span> <span class="mi">2</span> <span class="mi">1</span>
<span class="nb">i</span><span class="mi">1</span> <span class="o">+</span> <span class="mi">3</span> <span class="mi">3</span> <span class="mi">1</span>
<span class="nb">i</span><span class="mi">1</span> <span class="o">+</span> <span class="mi">3</span> <span class="mi">4</span> <span class="mi">2</span>
<span class="nb">e</span>
<span class="nt"></CsScore></span>
<span class="nt"></CsoundSynthesizer></span>
</pre>
</div>
</div>
</div>
<p><br class="example-break" />
<span class="phrase">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">
<a id="idm281472817850424"></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.csoundjournal.com/issue11/distortionSynthesis.html" target="_top"><em class="citetitle">http://www.csoundjournal.com/issue11/distortionSynthesis.html</em></a>, written by Victor Lazzarini</p>
<p>
</p>
</div>
<div class="refsect1">
<a id="idm281472817845928"></a>
<h2>Credits</h2>
<p>Written by John ffitch</p>
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