19. As practical signals are time limited, they have infinite frequenc

1.	19. As practical signals are time limited, they have infinite frequency bandwidths. Sampling ofsuch signals leads to aliasing. To avoid aliasing, an anti-aliasing filter is used(a) before the signal is reconstructed (b) after the signal is reconstructed(c) before the signal is sampled(d) after the signal is sampled
Answer» ANSWER: C Explanation:

19. As practical signals are time limited, they have infinite frequency bandwidths. Sampling ofsuch signals leads to aliasing. To avoid aliasing, an anti-aliasing filter is used(a) before the signal is reconstructed (b) after the signal is reconstructed(c) before the signal is sampled(d) after the signal is sampled

Answer»

Explanation: