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The width of each side lobes decreases with an decrease in M.

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The width of each side lobes decreases with an decrease in M.

(a) True

(b) False

This question was addressed to me in exam.

The above asked question is from Design of Linear Phase FIR Filters Using Windows topic in division Digital Filters Design of Digital Signal Processing

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Correct choice is (b) False

The best I can explain: Since the width of the main lobe is inversely proportional to the value of M, if the value of M increases then the main lobe becomes narrower. In fact, the width of each side lobes decreases with an increase in M.

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