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To what value should the bandwidth of x(n) has to be reduced in order to avoid aliasing?

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in Digital Signal Processing by (829k points)
To what value should the bandwidth of x(n) has to be reduced in order to avoid aliasing?

(a) F/D

(b) F/2D

(c) F/4D

(d) None of the mentioned

This question was addressed to me in semester exam.

The question is from Decimation by a Factor D in division Multirate Digital Signal Procesing of Digital Signal Processing

1 Answer

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Correct choice is (b) F/2D

For explanation I would say: To avoid aliasing, we must reduce the bandwidth of x(n) to Fmax=F/2D. Then we may down-sample by D and thus avoid sampling.

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