f # time size 20 window max opt
This subroutine generates functions of different windows. These windows are usually used for spectrum analysis or for grain envelopes.
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.
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.