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A Butterworth filter of what order has no ringing?

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A Butterworth filter of what order has no ringing?

(a) 1

(b) 2

(c) 3

(d) 4

The question was posed to me in quiz.

This question is from Smoothing Frequency-Domain Filters topic in division Intensity Transformations and Spatial Filtering of Digital Image Processing

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Correct answer is (a) 1

Explanation: A Butterworth filter of order 1 has no ringing and ringing exist for order 2 although is imperceptible. A Butterworth filter of higher order shows significant factor of ringing.

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