Signal Processing - Study Mode
[#111] The impulse response of a linear time invariant system is a rectangular pulse of duration T. It is excited by an input of a pulse of duration T. What is the filter output waveform?
Correct Answer
(D) Triangular pulse of duration 2T
[#112] Consider a cascade system with unit step u(t) as input and h 1 (t) = e -2t u(t) and h 2 (t) = e -t u(t) respectively as impulse responses of two systems, find out the overall output.
Correct Answer
(B) y(t) = [e -t - e -2t ]u(t)
[#113] A system has impulse response h[n] = cos(n)u[n]. The system is:
Correct Answer
(D) Causal and not stable
[#114] Consider the following system h(n) is a filter with frequency response, then
Correct Answer
(A) [Hleft( {{e^{jomega }}}
ight) = left{ x08egin{array}{l}
1,,,,,left| omega
ight| le pi /D\
0,,,,,{
m{otherwise}}
end{array}
ight.]
[#115] A discrete-time signal x[n] = δ[n - 3] + 2δ[n - 5] has z-transform X(z). If Y(z) = X(-z) is the z-transform of another signal y[n], then
Correct Answer
(C) y[n] = -x[n]