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When the frequency band is selected we can specify the sampling rate and the characteristics of the pre filter, which is also called as __________ filter.

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When the frequency band is selected we can specify the sampling rate and the characteristics of the pre filter, which is also called as __________ filter.

(a) Analog filter

(b) Anti aliasing filter

(c) Analog & Anti aliasing filter

(d) None of the mentioned

The question was posed to me in homework.

This key question is from Discrete-Time Processing of Continuous Time Signals in portion Discrete Time Systems Implementation of Digital Signal Processing

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The correct choice is (b) Anti aliasing filter

Explanation: Once the desired frequency band is selected we can specify the sampling rate and the characteristics of the pre filter, which is also called an anti aliasing filter. The anti aliasing filter is an analog filter which has a twofold purpose.

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