What’s the key difference between infinite impulse response (IIR) and finite impulse response (FIR) digital filters?
An infinite impulse response (IIR) filter incorporates feedback in its datapath, which means that any particular input sample can affect the output for an indefinite (infinite) time into the future. In contrast, a finite impulse response (FIR) filter uses only feedforward in its datapath, which means that any given input sample can only affect the output for a time corresponding to the number of storage (delay) stages in the filter.
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