Questions 1. TDM is possible for sampled signals. What kind of multiplexing can be used in continuous modulation systems? 2. What is the minimum rate at which a speech signal can be sampled for the purpose of PAM? 3. What is cross talk in the context of time division multiplexing? 4. Which is better, natural sampling or flat topped sampling and why? 5. Why a de offset has been added to the modulating signal in this board? Was it essential for the working of the modulator? Explain? 6. If the emitter follower in the modulator section saturates for some level of input signal, then what effect it will have on the output? 7. Derive the mathematical expression for frequency spectrum of PAM signal. 8. Explain the modulation circuit operation? 9. Explain the demodulation circuit operation? 10. Is PAM & Demodulation is sensitive to Noise?