On the design of FIR digital differentiators which are maximally linear at the frequency pi /p, p in (positive integers)
B. V. K. Vijaya Kumar, S. C. Dutta Roy, Himanshu Bhupendrabhai Shah · IEEE Transactions on Signal Processing · 1992
Digital differentiators (DDs) which are maximally linear at the spot frequency omega = pi /p, p in (positive integers) are proposed for operation over a narrow band of frequencies. The suggested DDs, besides giving zero phase error over the entire band of frequencies (- pi>