Return the Blackman window of size M, a taper formed with the first three terms of a summation of cosines.
w(n) = 0.42 - 0.5 * cos(2πn/(M-1)) + 0.08 * cos(4πn/(M-1)) for 0 <= n <= M-1.
w(n) = 0.42 - 0.5 * cos(2πn/(M-1)) + 0.08 * cos(4πn/(M-1))
0 <= n <= M-1
Return the Blackman window of size M, a taper formed with the first three terms of a summation of cosines.
w(n) = 0.42 - 0.5 * cos(2πn/(M-1)) + 0.08 * cos(4πn/(M-1))for0 <= n <= M-1.