<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>distort1</title>
<link rel="stylesheet" type="text/css" href="csound.css" />
<meta name="generator" content="DocBook XSL Stylesheets V1.76.1" />
<link rel="home" href="index.html" title="The Canonical Csound Reference Manual" />
<link rel="up" href="OpcodesTop.html" title="Orchestra Opcodes and Operators" />
<link rel="prev" href="distort.html" title="distort" />
<link rel="next" href="divz.html" title="divz" />
</head>
<body>
<div class="navheader">
<table width="100%" summary="Navigation header">
<tr>
<th colspan="3" align="center">distort1</th>
</tr>
<tr>
<td width="20%" align="left"><a accesskey="p" href="distort.html">Prev</a> </td>
<th width="60%" align="center">Orchestra Opcodes and Operators</th>
<td width="20%" align="right"> <a accesskey="n" href="divz.html">Next</a></td>
</tr>
</table>
<hr />
</div>
<div class="refentry" title="distort1">
<a id="distort1"></a>
<div class="titlepage"></div>
<a id="IndexDistort1" class="indexterm"></a>
<div class="refnamediv">
<h2>
<span class="refentrytitle">distort1</span>
</h2>
<p>distort1 —
Modified hyperbolic tangent distortion.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp18498136"></a>
<h2>Description</h2>
<p>
Implementation of modified hyperbolic tangent distortion. <span class="emphasis"><em>distort1</em></span> can be used to generate wave shaping distortion based on a modification of the <a class="link" href="tanh.html" title="tanh"><em class="citetitle">tanh</em></a> function.
</p>
<p>
</p>
<div class="literallayout">
<p><br />
exp(asig * (shape1 + pregain)) - exp(asig * (shape2 - pregain))<br />
aout = ---------------------------------------------------------------<br />
exp(asig * pregain) + exp(-asig * pregain)<br />
</p>
</div>
<p>
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp18509960"></a>
<h2>Syntax</h2>
<pre class="synopsis">ares <span class="command"><strong>distort1</strong></span> asig, kpregain, kpostgain, kshape1, kshape2[, imode]</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp18511136"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>imode</em></span> (Csound version 5.00 and later only; optional, defaults to 0) -- scales kpregain, kpostgain, kshape1, and kshape2 for use with audio signals in the range -32768 to 32768 (imode=0), -0dbfs to 0dbfs (imode=1), or disables scaling of kpregain and kpostgain and scales kshape1 by kpregain and kshape2 by -kpregain (imode=2).
</p>
</div>
<div class="refsect1" title="Performance">
<a id="idp18546016"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>asig</em></span> -- is the input signal.
</p>
<p>
<span class="emphasis"><em>kpregain</em></span> -- determines the amount of gain applied to the signal before waveshaping. A value of 1 gives slight distortion.
</p>
<p>
<span class="emphasis"><em>kpostgain</em></span> -- determines the amount of gain applied to the signal after waveshaping.
</p>
<p>
<span class="emphasis"><em>kshape1</em></span> -- determines the shape of the positive part of the curve. A value of 0 gives a flat clip, small positive values give sloped shaping.
</p>
<p>
<span class="emphasis"><em>kshape2</em></span> -- determines the shape of the negative part of the curve.
</p>
</div>
<div class="refsect1" title="Examples">
<a id="idp18549368"></a>
<h2>Examples</h2>
<p>
Here is an example of the distort1 opcode. It uses the file <a class="ulink" href="examples/distort1.csd" target="_top"><em class="citetitle">distort1.csd</em></a>.
</p>
<div class="example">
<a id="idp18550328"></a>
<p class="title">
<strong>Example 183. Example of the distort1 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">;;;RT audio out</span>
<span class="comment">;-iadc ;;;uncomment -iadc if RT audio input is needed too</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o distort1.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
gadist <span class="opc">init</span> 0
<span class="oblock">instr</span> 1
iamp <span class="op">=</span> p4
ifqc <span class="op">=</span> <span class="opc">cpspch</span>(p5)
asig <span class="opc">pluck</span> iamp, ifqc, ifqc, 0, 1
gadist <span class="op">=</span> gadist <span class="op">+</span> asig
<span class="oblock">endin</span>
<span class="oblock">instr</span> 50
kpre <span class="opc">init</span> p4
kpost <span class="opc">init</span> p5
kshap1 <span class="opc">init</span> p6
kshap2 <span class="opc">init</span> p7
aout <span class="opc">distort1</span> gadist, kpre, kpost, kshap1, kshap2, 1
<span class="opc">outs</span> aout, aout
gadist <span class="op">=</span> 0
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="comment">; Sta Dur Amp Pitch</span>
<span class="stamnt">i</span>1 0.0 3.0 0.5 6.00
<span class="stamnt">i</span>1 0.5 2.5 0.5 7.00
<span class="stamnt">i</span>1 1.0 2.0 0.5 7.07
<span class="stamnt">i</span>1 1.5 1.5 0.5 8.00
<span class="comment">; Sta Dur PreGain PostGain Shape1 Shape2</span>
<span class="stamnt">i</span>50 0 4 2 .5 0 0
<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="Credits">
<a id="idp18552640"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Hans Mikelson</td>
</tr>
<tr>
<td>December 1998</td>
</tr>
</table>
<p>
</p>
<p>New in Csound version 3.50</p>
</div>
</div>
<div class="navfooter">
<hr />
<table width="100%" summary="Navigation footer">
<tr>
<td width="40%" align="left"><a accesskey="p" href="distort.html">Prev</a> </td>
<td width="20%" align="center">
<a accesskey="u" href="OpcodesTop.html">Up</a>
</td>
<td width="40%" align="right"> <a accesskey="n" href="divz.html">Next</a></td>
</tr>
<tr>
<td width="40%" align="left" valign="top">distort </td>
<td width="20%" align="center">
<a accesskey="h" href="index.html">Home</a>
</td>
<td width="40%" align="right" valign="top"> divz</td>
</tr>
</table>
</div>
</body>
</html>
distrib
>
Mageia
>
5
>
x86_64
>
media
>
core-release
>
by-pkgid
>
b707d9a4ee443103660a75ccb6e51334
>
files
>
542
