This has to do with FIR Filters. I got the question pictured below wrong on a quiz and I'm not exactly sure why. It seemed simple because in my professor's lecture notes (also pictured below), the summation in the unit impulse response went from 0 to M. I assumed the answer to this question would be the same. Is the answer M+1 because of the causality of the system?
2026-04-06 01:41:44.1775439704
Can somebody tell me why the finite duration of the unit impulse response of this system is M+1?
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