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## GEN20

`
`**f** # time size 20 window max opt

__DESCRIPTION__

This subroutine generates functions of different windows. These windows
are usually used for spectrum analysis or for grain envelopes.

__INITIALIZATION__

*size* - number of points in the table. Must be a power of 2 (
+ 1). *window* - Type of window to generate.

` 1 - Hamming
2 - Hanning
3 - Bartlett ( triangle)
4 - Blackman ( 3 - term)
5 - Blackman - Harris ( 4 - term)
6 - Gaussian
7 - Kaiser
8 - Rectangle
9 - Sinc`

*max* - 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. *opt* - Optional argument
required by the Kaiser window.

__EXAMPLES:__

` `**f 1** 0 1024 20 5

This creates a function which contains a 4 - term Blackman - Harris
window with maximum value of 1.

` `**f 1** 0 1024 -20 2 456

This creates a function that contains a Hanning window with a maximum
value of 456.

` `**f 1** 0 1024 -20 1

This creates a function that contains a Hamming window with a maximum
value of 1.

` `**f 1** 0 1024 20 7 1 2

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.

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*HTML Csound Manual - ©
Jean Piché & Peter J. Nix, 1994-97*