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What is the approximate transition width of main lobe of a Hamming window?

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What is the approximate transition width of main lobe of a Hamming window?

(a) 4π/M

(b) 8π/M

(c) 12π/M

(d) 2π/M

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My question is from Design of Linear Phase FIR Filters Using Windows topic in section Digital Filters Design of Digital Signal Processing

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The correct choice is (b) 8π/M

Explanation: The transition width of the main lobe in the case of Hamming window is equal to 8π/M where M is the length of the window.

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