Q1. A causal discrete-time system is characterized by the difference equation: Уn] %3D у[п - 2] + x[n] — х[п — 4]. a. Find the transfer function, H(z), of this system. (Hint: (x* – 1) = (x – 1)(x + 1)(x – j)(x + j)) b. Plot the pole-zero diagram and clearly mention the ROC for H(z). c. Show that the system is unstable by specifying a bounded input, x[n], for which this system results in unbounded output.

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Q1. A causal discrete-time system is characterized by the difference equation:
У'п] %3D у[п — 2] + x[п] — х[п — 4].
a. Find the transfer function, H(z), of this system. (Hint: (x* – 1) = (x – 1)(x +
1)(x – j)(x + j))
b. Plot the pole-zero diagram and clearly mention the ROC for H(z).
c. Show that the system is unstable by specifying a bounded input, x[n], for which
this system results in unbounded output.
d. Sketch the magnitude of the frequency response, |H(w)| from –n <w< T.
e. Find a closed form expression for the output when the input is given as x[n] =
2 cos (n) + 3cos(Tn)
f. Find the impulse response, h[n], of the discrete-time system.
Transcribed Image Text:Q1. A causal discrete-time system is characterized by the difference equation: У'п] %3D у[п — 2] + x[п] — х[п — 4]. a. Find the transfer function, H(z), of this system. (Hint: (x* – 1) = (x – 1)(x + 1)(x – j)(x + j)) b. Plot the pole-zero diagram and clearly mention the ROC for H(z). c. Show that the system is unstable by specifying a bounded input, x[n], for which this system results in unbounded output. d. Sketch the magnitude of the frequency response, |H(w)| from –n <w< T. e. Find a closed form expression for the output when the input is given as x[n] = 2 cos (n) + 3cos(Tn) f. Find the impulse response, h[n], of the discrete-time system.
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