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Which of the following filter has a phase spectrum as shown in figure?

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Which of the following filter has a phase spectrum as shown in figure?

(a) Chebyshev filter

(b) Butterworth filter

(c) Bessel filter

(d) Elliptical filter

I had been asked this question during an interview for a job.

The origin of the question is Frequency Transformations in the Analog Domain in chapter Digital Filters Design of Digital Signal Processing

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Correct answer is (a) Chebyshev filter

Best explanation: The phase response given in the figure belongs to the frequency characteristic of a 13-order type-1 Chebyshev filter.

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