Discussion
IIR filters are :
Answer: A
IIR filters are recursive, with the present output depending on present and past inputs and past output samples.
An infinite impulse response filter feeds past outputs back into the calculation: y(n) = Σ bk x(n − k) − Σ ak y(n − k). This feedback (recursion) is what makes its impulse response last for ever.
A filter whose output depends only on present and past inputs is non-recursive; that is the FIR filter (option B). Option C calls such a filter recursive, which is contradictory, and option D calls a filter with output feedback non-recursive.
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