Design an FIR low-pass filter with a cuttoff of /3 and lengths N = 21 and N

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Design an FIR low-pass filter with a cuttoff of π/3 and lengths N = 21 and N = 81,

(a) Using a rectangular window

(b) Using Hamming and Kaiser (β = 4.5) windows, and compare the magnitude of the resulting filters.

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