Signal Processing - Study Mode
[#136] Consider an LTI system subjected to a wide sense stationary input {x(n)}, which is a white noise sequence. The cross correlation Φ xy [m] between input x(n) and output y(n) is: Where Φ xx [m] = $$sigma _{ ext{x}}^2delta left[ { ext{m}}
ight]$$ xa0and h[.] is impulse response
Correct Answer
(A) $$sigma _{ ext{x}}^2{ ext{h}}left[ { ext{m}}
ight]$$
[#137] If |H(ω)| = H(ω)H(-ω) then
Correct Answer
(B) h(n) has real value
[#138] Let x(n) be a real-valued sequence that is a sample sequence of a wide-sense stationary discrete-time random process. The power density of this signal is
Correct Answer
(B) real, even and non-negative
[#139] Consider an impulse response h[n] = {-3, -1, 2, 1, 3}, system is . . . . . . . . phase and . . . . . . . . pass filter.
Correct Answer
(D) Non linear, all band
[#140] If the input x(t) = u(t) + u(t - 1) is applied to a LTI system whose impulse response is given by h(t) = δ(t), then the response of the system y(t) is
Correct Answer
(B) u(t) + u(t - 1)