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In which of the following way the real valued desired frequency response is defined?

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In which of the following way the real valued desired frequency response is defined?

(a) Unity in stop band and zero in pass band

(b) Unity in both pass and stop bands

(c) Unity in pass band and zero in stop band

(d) Zero in both stop and pass band

This question was posed to me in an interview.

My question is from Design of Optimum Equi Ripple Linear Phase FIR Filters topic in portion Digital Filters Design of Digital Signal Processing

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Right option is (c) Unity in pass band and zero in stop band

Explanation: The real valued desired frequency response Hdr(ω) is simply defined to be unity in the pass band and zero in the stop band.

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