Analog Communication - Electronic Engineering (MCQ) questions & answers for Q. 13850

Q.  A distorted signal of frequency fm is recovered from a sampled signal if the sampling frequency fs is
- Published on 16 Oct 15

a. fs > 2fm
b. fs < 2fm
c. fs = 2fm
d. fs ≥ 2fm

ANSWER: fs < 2fm
 
If the signal of frequency fm is sampled at the rate fs ≥ 2fm only then the spectrum of the sampled signal is obtained without overlapping. For fs < 2fm the sampled signal spectrum overlap each other, and therefore the signal cannot be recovered easily. For reconstruction of signal to be free from distortion, the important condition is
fs ≥ 2fm

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