railway DFCCIL Junior Executive 2023 (CBT 1 & CBT 2) Mock Test Communication Systems Sampling Sampling Theorem
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
1
\({T_S} \ge \frac{1}{{\left( {2{f_m}} \right)}}\)
2
\({T_S} \le \frac{1}{{\left( {2{f_m}} \right)}}\)
3
\({T_S} \ge \frac{2}{{{f_m}}}\)
4
\({T_S} \le \frac{2}{{{f_m}}}\)