A range of commonly-used window functions may automatically be applied to data as it is read into the fft and ifft commands; these are listed together with their algebraic forms in TableĀ 5.1 and shown in FigureĀ 5.1. In each case, the window functions are given for sample number , which ranges between
and
. The window functions may be invoked using the following syntax:
fft [...] <out>() of <in>() window <window_name>
Where multi-dimensional FFTs are performed, window functions are applied to each dimension in turn. Other arbitrary window functions may be implemented by pre-multiplying data before entry to the fft and ifft commands.
Window Name |
Algebraic Definition |
Bartlett |
|
BartlettHann |
|
|
|
Cosine |
|
Gauss |
|
Hamming |
|
Hann |
|
Lanczos |
|
Rectangular |
|
Triangular |
|