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What is the weighting function used in the design of FIR differentiators based on the chebyshev approximation criterion?

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What is the weighting function used in the design of FIR differentiators based on the chebyshev approximation criterion?

(a) 1/ω

(b) ω

(c) 1+ω

(d) 1-ω

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I would like to ask this question from Design of FIR Differentiators in chapter Digital Filters Design of Digital Signal Processing

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Correct choice is (a) 1/ω

To elaborate: In the design of FIR differentiators based on the chebyshev approximation criterion, the weighting function W(ω) is specified in the program as

W(ω)=1/ω

in order that the relative ripple in the pass band be a constant.

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