Two flat-topped PAM signals are time-division multiplexed together to produce a composite TDM PAM signal that is transmitted over a channel. The first PAM signal is obtained from an analog signal that has a rectangular spectrum, W1(f) = Π(f/2B). The second PAM signal is obtained from an analog signal that has a triangular spectrum W2(f) = (f/B), where B = 3 kHz
(a) Determine the minimum sampling frequency for each signal, and design a TDM commutator and decommutator to accommodate these signals.
(b) Calculate and sketch the magnitude spectrum for the composite TDM PAM signal.