The salient feature of sampled data systems is ______.

The salient feature of sampled data systems is ______.

a. They affect signals at frequencies greater than twice the sampling frequency
b. They affect signals at frequencies greater than one-half the sampling frequency
c. They affect signals at frequencies lesser than twice the sampling frequency
d. They affect signals at frequencies greater than one-fourth the sampling frequency

Correct Answer : b. They affect signals at frequencies greater than one-half the sampling frequency

Explanation :

If a signal at frequencies greater than one-half the sampling frequency is applied to an input of sampled data systems, then it will get reflected to a frequency less than one-half the sampling frequency. This effect ultimately give rise to a phenomenon known as 'Aliasing Effect'. It is feasible to minimize or eliminate this effect by limiting the input signal spectrum to less than one half the sampling frequency.