In a filter, all the frequencies inside a circle of radius D0 are not – McqOptions

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1.	In a filter, all the frequencies inside a circle of radius D0 are not attenuated while all frequencies outside circle are completely attenuated. The D0 is the specified nonnegative distance from origin of the Fourier transform. Which of the following filter(s) characterizes the same?
A.	Ideal filter
B.	Butterworth filter
C.	Gaussian filter
D.	All of the mentioned
Answer» B. Butterworth filter

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