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To reduce side lobes, in which region of the filter the frequency specifications have to be optimized?

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To reduce side lobes, in which region of the filter the frequency specifications have to be optimized?

(a) Stop band

(b) Pass band

(c) Transition band

(d) None of the mentioned

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

The origin of the question is Design of Linear Phase FIR Filters by Frequency Sampling Method topic in division Digital Filters Design of Digital Signal Processing

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Best answer
The correct option is (c) Transition band

Best explanation: To reduce the side lobes, it is desirable to optimize the frequency specification in the transition band of the filter. This optimization can be accomplished numerically on a digital computer by means of linear programming techniques.

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