The anti-aliasing filter has a higher cut-off frequency fm. Its output is sampled periodically every Ts seconds. For proper recovery of the signal at the receiver, Ts must be
A. $${T_s} \geqslant \frac{1}{{2{f_m}}}$$
B. $${T_s} \leqslant \frac{1}{{2{f_m}}}$$
C. $${T_s} \geqslant \frac{2}{{{f_m}}}$$
D. $${T_s} \leqslant \frac{2}{{{f_m}}}$$
Answer: Option B
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