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

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

(a) 4π/M

(b) 8π/M

(c) 12π/M

(d) 2π/M

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The correct answer is (c) 12π/M

Best explanation: The transition width of the main lobe in the case of Blackman window is equal to 12π/M where M is the length of the window.

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