<?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>GEN20</title>
<link rel="stylesheet" type="text/css" href="csound.css" />
<link rel="stylesheet" type="text/css" href="syntax-highlighting.css" />
<meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" />
<link rel="home" href="index.html" title="The Canonical Csound Reference Manual" />
<link rel="up" href="ScoregensTop.html" title="Score Statements and GEN Routines" />
<link rel="prev" href="GEN19.html" title="GEN19" />
<link rel="next" href="GEN21.html" title="GEN21" />
</head>
<body>
<div class="navheader">
<table width="100%" summary="Navigation header">
<tr>
<th colspan="3" align="center">GEN20</th>
</tr>
<tr>
<td width="20%" align="left"><a accesskey="p" href="GEN19.html">Prev</a> </td>
<th width="60%" align="center">Score Statements and GEN Routines</th>
<td width="20%" align="right"> <a accesskey="n" href="GEN21.html">Next</a></td>
</tr>
</table>
<hr />
</div>
<div class="refentry">
<a id="GEN20"></a>
<div class="titlepage"></div>
<a id="IndexGEN20" class="indexterm"></a>
<div class="refnamediv">
<h2>
<span class="refentrytitle">GEN20</span>
</h2>
<p>GEN20 —
Generates functions of different windows.
</p>
</div>
<div class="refsect1">
<a id="idm281472819235976"></a>
<h2>Description</h2>
<p>
This subroutine generates functions of different windows. These windows are usually used for spectrum analysis or for grain envelopes.
</p>
</div>
<div class="refsect1">
<a id="idm281472819234632"></a>
<h2>Syntax</h2>
<pre class="synopsis"><span class="command"><strong>f</strong></span> # time size 20 window max [opt]</pre>
</div>
<div class="refsect1">
<a id="idm281472819153608"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>size</em></span> -- number of points in the table. Must be a power of 2 ( + 1).
</p>
<p>
<span class="emphasis"><em>window</em></span> -- Type of window to generate:
</p>
<div class="itemizedlist">
<ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
<p>1 = Hamming</p>
</li>
<li class="listitem">
<p>2 = Hanning</p>
</li>
<li class="listitem">
<p>3 = Bartlett ( triangle)</p>
</li>
<li class="listitem">
<p>4 = Blackman ( 3-term)</p>
</li>
<li class="listitem">
<p>5 = Blackman - Harris ( 4-term)</p>
</li>
<li class="listitem">
<p>6 = Gaussian</p>
</li>
<li class="listitem">
<p>7 = Kaiser</p>
</li>
<li class="listitem">
<p>8 = Rectangle</p>
</li>
<li class="listitem">
<p>9 = Sync</p>
</li>
</ul>
</div>
<p>
</p>
<p>
<span class="emphasis"><em>max</em></span> -- For negative p4 this will be the absolute
value at window peak point. If p4 is positive or p4 is negative
and p6 is missing the table will be post-rescaled to a maximum
value of 1.
</p>
<p>
<span class="emphasis"><em>opt</em></span> -- Optional argument required by the
Gaussian window and the Kaiser window.
</p>
</div>
<div class="refsect1">
<a id="idm281472819141768"></a>
<h2>Examples</h2>
<p>
</p>
<div class="informalexample">
<pre class="programlisting">
<span class="stamnt">f</span> 1 0 1024 20 5</pre>
</div>
<p>
This creates a function which contains a 4 - term Blackman - Harris window with maximum value of 1.
</p>
<p>
</p>
<div class="informalexample">
<pre class="programlisting">
<span class="stamnt">f</span> 1 0 1024 -20 2 456</pre>
</div>
<p>
This creates a function that contains a Hanning window with a maximum value of 456.
</p>
<p>
</p>
<div class="informalexample">
<pre class="programlisting">
<span class="stamnt">f</span> 1 0 1024 -20 1</pre>
</div>
<p>
This creates a function that contains a Hamming window with a maximum value of 1.
</p>
<p>
</p>
<div class="informalexample">
<pre class="programlisting">
<span class="stamnt">f</span> 1 0 1024 20 7 1 2</pre>
</div>
<p>
This creates a function that contains a Kaiser window with a maximum value of 1. The extra argument specifies how "open" the window is, for example a value of 0 results in a rectangular window and a value of 10 in a Hamming like window.
</p>
<p>
</p>
<div class="informalexample">
<pre class="programlisting">
<span class="stamnt">f</span> 1 0 1024 20 6 1 2</pre>
</div>
<p>
This creates a function that contains a Gaussian window with a
maximum value of 1. The extra argument specifies how broad the
window is, as the standard deviation of the curve; in this
example the s.d. is 2. The default value is 1.
</p>
<p>
For all diagrams, see <a class="link" href="MiscWindows.html" title="Appendix F. Window Functions"><em class="citetitle">Window Functions</em></a>
</p>
<p>
Here is an example of the GEN20 routine. It uses the file <a class="ulink" href="examples/gen20.csd" target="_top"><em class="citetitle">gen20.csd</em></a>.
</p>
<div class="example">
<a id="idm281472819126296"></a>
<p class="title">
<strong>Example 1201. Example of the GEN20 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="idm281472680605176"></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 gen20.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>
i<span class="n">nsnd</span> <span class="o">=</span> <span class="mi">10</span> <span class="c1">;"fox.wav"</span>
i<span class="n">basfrq</span> <span class="o">=</span> <span class="mi">44100</span> <span class="o">/</span> <span class="nb">ftlen</span><span class="p">(</span>i<span class="n">nsnd</span><span class="p">)</span> <span class="c1">;use original sample rate of insnd file </span>
k<span class="n">amp</span> <span class="nb">expseg</span> <span class="mf">.001</span><span class="p">,</span> <span class="nb">p3</span><span class="o">/</span><span class="mi">2</span><span class="p">,</span> <span class="mf">.7</span><span class="p">,</span> <span class="nb">p3</span><span class="o">/</span><span class="mi">2</span><span class="p">,</span> <span class="mf">.8</span> <span class="c1">;envelope</span>
k<span class="n">pitch</span> <span class="nb">line</span> i<span class="n">basfrq</span><span class="p">,</span> <span class="nb">p3</span><span class="p">,</span> i<span class="n">basfrq</span> <span class="o">*</span> <span class="mf">.8</span>
k<span class="n">dens</span> <span class="nb">line</span> <span class="mi">600</span><span class="p">,</span> <span class="nb">p3</span><span class="p">,</span> <span class="mi">10</span>
k<span class="n">aoff</span> <span class="nb">line</span> <span class="mi">0</span><span class="p">,</span> <span class="nb">p3</span><span class="p">,</span> <span class="mf">.1</span>
k<span class="n">poff</span> <span class="nb">line</span> <span class="mi">0</span><span class="p">,</span> <span class="nb">p3</span><span class="p">,</span> i<span class="n">basfrq</span> <span class="o">*</span> <span class="mf">.5</span>
k<span class="n">gdur</span> <span class="nb">line</span> <span class="mf">.04</span><span class="p">,</span> <span class="nb">p3</span><span class="p">,</span> <span class="mf">.001</span> <span class="c1">;shorten duration of grain during note</span>
i<span class="n">maxgdur</span> <span class="o">=</span> <span class="mf">.5</span>
i<span class="n">gfn</span> <span class="o">=</span> <span class="nb">p4</span> <span class="c1">;different windows</span>
a<span class="n">sigL</span> <span class="nb">grain</span> k<span class="n">amp</span><span class="p">,</span> k<span class="n">pitch</span><span class="p">,</span> k<span class="n">dens</span><span class="p">,</span> k<span class="n">aoff</span><span class="p">,</span> k<span class="n">poff</span><span class="p">,</span> k<span class="n">gdur</span><span class="p">,</span> i<span class="n">nsnd</span><span class="p">,</span> i<span class="n">gfn</span><span class="p">,</span> i<span class="n">maxgdur</span><span class="p">,</span> <span class="mf">0.0</span>
a<span class="n">sigR</span> <span class="nb">grain</span> k<span class="n">amp</span><span class="p">,</span> k<span class="n">pitch</span><span class="p">,</span> k<span class="n">dens</span><span class="p">,</span> k<span class="n">aoff</span><span class="p">,</span> k<span class="n">poff</span><span class="p">,</span> k<span class="n">gdur</span><span class="p">,</span> i<span class="n">nsnd</span><span class="p">,</span> i<span class="n">gfn</span><span class="p">,</span> i<span class="n">maxgdur</span><span class="p">,</span> <span class="mf">0.0</span>
<span class="nb">outs</span> a<span class="n">sigL</span><span class="p">,</span> a<span class="n">sigR</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">512</span> <span class="mi">20</span> <span class="mi">2</span> <span class="c1">;Hanning window </span>
<span class="nb">f</span><span class="mi">2</span> <span class="mi">0</span> <span class="mi">512</span> <span class="mi">20</span> <span class="mi">6</span> <span class="mi">1</span> <span class="c1">;Gaussian window </span>
<span class="nb">f</span><span class="mi">10</span> <span class="mi">0</span> <span class="mi">16384</span> <span class="mi">1</span> <span class="s">"fox.wav"</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span>
<span class="nb">i</span><span class="mi">1</span> <span class="mi">0</span> <span class="mi">5</span> <span class="mi">1</span> <span class="c1">;use Hanning window </span>
<span class="nb">i</span><span class="mi">1</span> <span class="o">+</span> <span class="mi">5</span> <span class="mi">2</span> <span class="c1">;use Gaussian window</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 GEN20 routines, as used in the example:</span>
</p>
<div class="mediaobject">
<img src="images/gen20_1.png" alt="f 1 0 512 20 2 - Hanning window" />
<div class="caption">
<p> f 1 0 512 20 2 - Hanning window</p>
</div>
</div>
<p>
</p>
<div class="mediaobject">
<img src="images/gen20_2.png" alt="f 2 0 512 20 6 1 - Gaussian window" />
<div class="caption">
<p> f 2 0 512 20 6 1 - Gaussian window</p>
</div>
</div>
<p>
</p>
</div>
<div class="refsect1">
<a id="idm281472819114920"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Paris Smaragdis</td>
</tr>
<tr>
<td>MIT, Cambridge</td>
</tr>
<tr>
<td>1995</td>
</tr>
</table>
<p>
</p>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: John ffitch</td>
</tr>
<tr>
<td>University of Bath/Codemist Ltd.</td>
</tr>
<tr>
<td>Bath, UK</td>
</tr>
</table>
<p>
</p>
<p>New in Csound version 3.2</p>
<p>Optional argument to Gaussian added in 5.10</p>
</div>
</div>
<div class="navfooter">
<hr />
<table width="100%" summary="Navigation footer">
<tr>
<td width="40%" align="left"><a accesskey="p" href="GEN19.html">Prev</a> </td>
<td width="20%" align="center">
<a accesskey="u" href="ScoregensTop.html">Up</a>
</td>
<td width="40%" align="right"> <a accesskey="n" href="GEN21.html">Next</a></td>
</tr>
<tr>
<td width="40%" align="left" valign="top">GEN19 </td>
<td width="20%" align="center">
<a accesskey="h" href="index.html">Home</a>
</td>
<td width="40%" align="right" valign="top"> GEN21</td>
</tr>
</table>
</div>
</body>
</html>
distrib
>
Mageia
>
7
>
armv7hl
>
media
>
core-release
>
by-pkgid
>
5fcfcb7517038d1f44ab4e478e6e61fa
>
files
>
143
