Sampling interval drift in digital filters
Thomas A. Brubaker, WILLIAM B. RISLEY · International Journal of Electronics · 1973
The effect of sampling interval drift on the digital filter magnitude function is considered for impulse invariant and bilinear transform design methods. For both types of filter designs a change in the sampling interval will cause critical filter frequencies to shift. The expression for this shift is shown to be the same for the two design methods. Finally, a time-domain analysis shows that the problem can be considered in terms of a perturbed input signal and an unperturbed filter