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Which of the following filters have a frequency response as shown below?

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Which of the following filters have a frequency response as shown below?

(a) Band pass filter

(b) Band stop filter

(c) All pass filter

(d) Notch filter

This question was addressed to me during an internship interview.

This interesting question is from LTI System as Frequency Selective Filters in portion Frequency Analysis of Signals and Systems of Digital Signal Processing

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Correct choice is (d) Notch filter

The explanation is: The given figure represents the frequency response characteristic of a notch filter with nulls at frequencies at ω0 and ω1.

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