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I think that would be sort of like comparing apples and pairs. But not sure.
The slope response is different when viewed on the Spectrum Analyzer. FIR filters exhibit a phase linear response during their transition from one frequency to another.(Bessel).
FIR filters exhibit much steeper cutoff slopes while IIR filters produce pass bands identical to their analog counterparts (ie - Butterworth, Chebyshev,
Nth Order).
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