If the starting (or ending period) of the Corbae-Ouliaris FD filter can be specified in terms of a fraction of pi, why
six (6) periods translates to 2/6=0.3333 radians instead of "pi/6" ? From where comes that number two (2)?
Thanks in advance and I'm sorry if my question is silly, I couldn't found the original paper of Corbae-Ouliaris (2006).
