Teaching TN TRB EC Mock Test Signals and Systems Discrete Fourier Transform (DFT) and Discrete Fourier Series (DFS)
Given two finite duration sequences x1(n) and x2(n) that are zero outside the interval [0,99]. These sequences are convolved to generate y(n) = x1(n) ⊕ x2(n). If x1(n) is defined for 10 ≤ n ≤ 39 and x2(n) is defined for 20 ≤ n ≤ 40, the values of ‘n’ for which y(n) = x1(n) ⊕ x2(n) is defined is:
1
30 ≤ n ≤ 79
2
10 ≤ n ≤ 39
3
10 ≤ n 100
4
39 ≤ n ≤ 99