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What is the peak side lobe (in dB) for a Hanning window?

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What is the peak side lobe (in dB) for a Hanning window?

(a) -13

(b) -27

(c) -32

(d) -58

I got this question in homework.

This is a very interesting question from Design of Linear Phase FIR Filters Using Windows topic in section Digital Filters Design of Digital Signal Processing

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Correct option is (c) -32

Easiest explanation: The peak side lobe in the case of Hanning window has a value of -32dB.

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