Question

If the signal to be analyzed is an analog signal, we would pass it through an anti-aliasing filter with B as the bandwidth of the filtered signal and then the signal is sampled at a rate __________

(a) Fs ≤ 2B

(b) Fs ≤ B

(c) Fs ≥ 2B

(d) Fs = 2B

I have been asked this question in an online interview.

This interesting question is from Frequency Analysis of Signals Using DFT in division Discrete Fourier Transform – Properties and Applications of Digital Signal Processing

Answer 1

Right option is (c) Fs ≥ 2B

Explanation: The filtered signal is sampled at a rate of Fs≥ 2B, where B is the bandwidth of the filtered signal to prevent aliasing.