EE 242 Signal Processing I Winter 2022 Quiz 2
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Department of Electrical and Computer Engineering
Winter 2022 - EE 242 Signal Processing I
Quiz 2
Problem 1 (10pts)
Suppose that a discrete-time linear system has output y[n] for the given input x[n] as shown in Figure 1andFigure 2.
Linear |
|
Find 4 [] given 4 [] shown below. Show your work (hint: superposition)
4 [] 1
Linear |
- 1
b) Determine whether the system is time-invariant. (Mathematical derivation for positive proof or counter example for a negative one)
Problem 2 (10pts)
For each part of the problem find the expression for and graph () if ℎ() = − ().
a) 1 () = ()
b) 2 () =
2
1 3
Problem 3 (10pts)
Discrete-time LTI systems. Consider a signal 1 [] = [] − [ − 4] and an LTI system T
with impulse response ℎ[] = []
Answer the following questions about the system T, as described by ℎ[] and justify your answer for each:
a) Memoryless?
b) Causal?
c) Stable?
Problem 4 (20pts)
Continuous-time Fourier Series and LTI systems
a) Consider an input signal () = 5 + 4 cos(3) cos(2) + sin(2) + 3
Find the Fourier Series representation (fundamental frequency and coefficients ) of () such that
() =
= −∞
b) Find () given and the FS coefficients that
= 6 = 4 = 1.7 = −2 = 3 5 = −3 Be sure to show () as sinusoid when possible
Bonus Problem (5pts)
Find the Fourier series coefficients for each of the following signals.
a) () = [1 + cos()] [sin(6 − )]
b) () = 5( − 3) (() is from part a)
2022-04-26