A continuous-time signal x(t) is sampled at a 10-Hz rate, with the resulting discretetime signals as given. Find the time constant τ for each signal, and the frequency ω of the sinusoidal signals.
(a) x[n] = (.7)n
(b) x[n] = (–.7)n
(c) x[n] = (.5)n cos(3n)
(d) x[n] = (.1)n sin(0.2n + 1)
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