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<HTML>
<TITLE>GEN20</TITLE>
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<H2>GEN20</H2>
<PRE><TT>
<B>f</B> # time size 20 window max opt</TT>
</PRE>
<P>
<HR></P>
<H4><U>DESCRIPTION</U></H4>
<P>This subroutine generates functions of different windows. These windows
are usually used for spectrum analysis or for grain envelopes. </P>
<H4><U>INITIALIZATION</U></H4>
<P><I>size</I> - number of points in the table. Must be a power of 2 (
+ 1). <I>window</I> - Type of window to generate. </P>
<PRE><TT> 1 - Hamming
2 - Hanning
3 - Bartlett ( triangle)
4 - Blackman ( 3 - term)
5 - Blackman - Harris ( 4 - term)
6 - Gaussian
7 - Kaiser
8 - Rectangle
9 - Sinc</TT>
</PRE>
<P><I>max</I> - 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. <I>opt</I> - Optional argument
required by the Kaiser window. </P>
<H4><U>EXAMPLES:</U></H4>
<PRE><TT> <B>f 1</B> 0 1024 20 5</TT>
</PRE>
<P>This creates a function which contains a 4 - term Blackman - Harris
window with maximum value of 1. </P>
<PRE><TT> <B>f 1</B> 0 1024 -20 2 456</TT>
</PRE>
<P>This creates a function that contains a Hanning window with a maximum
value of 456. </P>
<PRE><TT> <B>f 1</B> 0 1024 -20 1</TT>
</PRE>
<P>This creates a function that contains a Hamming window with a maximum
value of 1. </P>
<PRE><TT> <B>f 1</B> 0 1024 20 7 1 2</TT>
</PRE>
<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>
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