Noun
Hann function
(signal processing) A discrete window function,
w
(
n
)
=
1
2
(
1
−
cos
(
2
π
n
N
−
1
)
)
{\displaystyle w(n)={\frac {1}{2}}\;\left(1-\cos \left({\frac {2\pi n}{N-1}}\right)\right)}
, typically used to select a subset of a series of samples in order to perform a Fourier transform or other calculation.