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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="id3739416"></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="id3739428"></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="id3739173"></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="id3740175"></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 diagrams, see <a class="link" href="MiscWindows.html" title="Appendix F. Window Functions"><em class="citetitle">Window Functions</em></a>
</p>
</div>
<div class="refsect1" title="Credits">
<a id="id3740309"></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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