The system shown in Figure is used to time-division multiplex a number of PAM signals. The...

The system shown in Figure is used to time-division multiplex a number of PAM signals. The pulses are obtained by sampling audio signals containing maximum frequencies of 3,400 Hz, with a sampling rate of 8 kHz.

(a) If the pulses are 10 π s in duration, how many PAM signals can be multiplexed?

---

(b) If the pulses are 10 π s in duration, what is the first-null bandwidth of the TDM signal?