1. (6 pts) Consider a causal LTI system described by the following difference equation:
y(n) = —0.8y(n — 1) + x(n)
a) Is this system a FIR or IIR filter? Explain.
b) Find the frequency response H(Q) of the system. Plot |H(Q)|. Prove that |H(Q)|
is symmetric.
c) Is this system a low-pass or high-pass filter? Explain.
d) Consider the following signal:
x(n) = 5 + 10sin(an/6) + 10cos(an/2), -oo<n<too
Is this signal periodic? What is its period? Plot |X(0)|, where X(Q) is the DTFT
of x(n).
e) Determine the response y(n) of the system to the input signal x(n) in question d).
f) Plot |¥(Q)|, where Y(Q) is the DTFT of y(n). Comment.
g) Consider x(n) = x(n), n=0,1,..,11. Find the 12-point DFT Xo(k) of x(n).Plot
IXo(K)I-
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