Return the Hann window of size M, a taper with a weighted cosine bell.
w(n) = 0.5 - 0.5 * cos(2πn/(M-1)) for 0 <= n <= M-1.
w(n) = 0.5 - 0.5 * cos(2πn/(M-1))
0 <= n <= M-1
Return the Hann window of size M, a taper with a weighted cosine bell.
w(n) = 0.5 - 0.5 * cos(2πn/(M-1))for0 <= n <= M-1.