An analog signal xa (t) = sin(480πt) + 3sin(720πt) is sampled 600 times per second.
(a) Determine the Nyquist sampling rate for xa{t).
(b) Determine the folding frequency.
(c) What are the frequencies, in radians, in the resulting discrete time signal x(n)?
(d) If is passed through an ideal D/A converter, what is the reconstructed signal xa(t)?