Extra exam question E7F12

WhyFIR filters can delay all frequency components of a signal by the same amount. FIR (Finite Impulse Response) filters can be designed with a linear phase response, meaning they delay every frequency component of a signal by the same fixed amount, preserving the signal's waveform shape through the filter, a property that IIR filters generally can't match, answer A. FIR filters aren't necessarily easier to implement for a given rolloff requirement (they often need more taps than an equivalent IIR filter), and they don't inherently respond faster to impulses, so "all these choices" overstates their general characteristics.