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Which of the following is not a characteristic of FIR filter?

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Which of the following is not a characteristic of FIR filter?

(a) Many zeroes

(b) Poles only at z=0

(c) Transfer function is a polynomial of z-1

(d) Many poles

The question was posed to me during an interview.

My doubt stems from Equalization Techniques topic in chapter Equalization, Diversity and Channel Coding of Wireless/Mobile

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Right option is (d) Many poles

Explanation: Finite impulse response filter (FIR) has many zeroes but poles only at z=0. The transfer function of the filter is a polynomial of z-1. It is also referred to as transversal filter.

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