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<div class="refentry" title="GEN20">
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<h2>
<span class="refentrytitle">GEN20</span>
</h2>
<p>GEN20 —
Generates functions of different windows.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp77866512"></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" title="Syntax">
<a id="idp77867256"></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" title="Initialization">
<a id="idp77877600"></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" 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" title="Examples">
<a id="idp77923416"></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="idp77932048"></a>
<p class="title">
<strong>Example 1056. 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>
<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 gen20.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
insnd <span class="op">=</span> 10 <span class="comment">;"fox.wav"</span>
ibasfrq <span class="op">=</span> 44100 <span class="op">/</span> <span class="opc">ftlen</span>(insnd) <span class="comment">;use original sample rate of insnd file </span>
kamp <span class="opc">expseg</span> .001, p3<span class="op">/</span>2, .7, p3<span class="op">/</span>2, .8 <span class="comment">;envelope</span>
kpitch <span class="opc">line</span> ibasfrq, p3, ibasfrq <span class="op">*</span> .8
kdens <span class="opc">line</span> 600, p3, 10
kaoff <span class="opc">line</span> 0, p3, .1
kpoff <span class="opc">line</span> 0, p3, ibasfrq <span class="op">*</span> .5
kgdur <span class="opc">line</span> .04, p3, .001 <span class="comment">;shorten duration of grain during note</span>
imaxgdur <span class="op">=</span> .5
igfn <span class="op">=</span> p4 <span class="comment">;different windows</span>
asigL <span class="opc">grain</span> kamp, kpitch, kdens, kaoff, kpoff, kgdur, insnd, igfn, imaxgdur, 0.0
asigR <span class="opc">grain</span> kamp, kpitch, kdens, kaoff, kpoff, kgdur, insnd, igfn, imaxgdur, 0.0
<span class="opc">outs</span> asigL, asigR
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">f</span>1 0 512 20 2 <span class="comment">;Hanning window </span>
<span class="stamnt">f</span>2 0 512 20 6 1 <span class="comment">;Gaussian window </span>
<span class="stamnt">f</span>10 0 16384 1 "<span class="stamnt">f</span>ox.wav" 0 0 0
<span class="stamnt">i</span>1 0 5 1 <span class="comment">;use Hanning window </span>
<span class="stamnt">i</span>1 + 5 2 <span class="comment">;use Gaussian window</span>
<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 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" title="Credits">
<a id="idp77938088"></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>
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