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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 mentionedThis 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

Answer»

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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