engineering recuitment HAL Management & Design Trainee Mock Test 2023 Signals and Systems Discrete Time Fourier Transform (DTFT)
H(ejω) is the frequency response of a discrete time LTI system and H1(ejω) is the frequency response of its inverse function. Then
1
H(ejω)H1(ejω) = 1
2
H(ejω)H1(ejω) = δ(ω)
3
H(ejω) * H1(ejω) = 1
4
H(ejω) * H1 (ejω) = δ(ω)