Question 2
Marks : +2 | -2
Pass Ratio : 100%
An LTI system is said to be causal if and only if?
Explanation: Let us consider a LTI system having an output at time n=n0 given by the convolution formula
Question 7
Marks : +2 | -2
Pass Ratio : 100%
Determine the impulse response for the cascade of two LTI systems having impulse responses h1(n)=\\((\\frac{1}{2})^2\\) u(n) and h2(n)=\\((\\frac{1}{4})^2\\) u(n).
Explanation: Let h2(n) be shifted and folded.
Question 9
Marks : +2 | -2
Pass Ratio : 100%
Determine the output y(n) of a LTI system with impulse response h(n)=anu(n), |a|<1with the input sequence x(n)=u(n).
Explanation: Now fold the signal x(n) and shift it by one unit at a time and sum as follows