(a) Determine the power spectra for the random processes generated by the following difference equations.
1. x(n) = —0.81x (n — 2) + w(n) — w(n — 1)
2. x(n) = w(n) — w(n — 2)
3. x(n) —0.81x (n — 2) + w(n)
where w(n) is a white noise process with variance. .
(b) Sketch the spectra for the processes given in part (a).
(c) Determine the autocorrelation for the processes in (2) and (3).
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