Improving the time domain response of fractional order digital differentiators by windowing
Why (j?)? ( j ? ) ? is not the ideal frequency spectrum of digital differentiators is explained. Causes of time domain response degradation of digital differentiators are detailed. Two windows which reduce oscillation and approximation order are proposed. Approximation using FIR filter can be as good as that using IIR filter.
window fractional order differentiator non-bandlimited signals spectrum leakage