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Why is it desirable to optimize frequency response in the transition band of the filter?

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Why is it desirable to optimize frequency response in the transition band of the filter?

(a) Increase side lobe

(b) Reduce side lobe

(c) Increase main lobe

(d) None of the mentioned

This question was posed to me by my school teacher while I was bunking the class.

My question is based upon Design of Linear Phase FIR Filters by Frequency Sampling Method in chapter Digital Filters Design of Digital Signal Processing

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The correct option is (b) Reduce side lobe

For explanation: To reduce side lobes, it is desirable to optimize the frequency specification in the transition band of the filter.

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