Kaiser window

The Kaiser window is formed by the Bessel function.

Note

Bessel functions are solutions of the Bessel differential equations (see http://en.wikipedia.org/wiki/Bessel_function).

The formula is as follows:

Here I₀ is the zero order Bessel function. The NumPy kaiser() function returns the Kaiser window. The first parameter is the number of points in the output window. If this number is 0 or less than 0, the function returns an empty array. The second parameter is the beta.