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# GEN20

GEN20 -- Generates functions of different windows.

## Description

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

## Syntax

f # time size 20 window max [opt]

## 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 = Sync

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.

For diagrams, see Window Functions

## Credits

Author: Paris Smaragdis
MIT, Cambridge
1995

Author: John ffitch
University of Bath/Codemist Ltd.
Bath, UK

New in Csound version 3.2

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