Pulse amplitude modulation

In pulse amplitude modulation,

Options:

a) Amplitude of the pulse train is varied
b) Width of the pulse train is varied
c) Frequency of the pulse train is varied
d) None of the above

Correct Answer: Amplitude of the pulse train is varied

Explanation:

Pulse amplitude modulation is a type of analog pulse modulation system. In pulse modulation systems, the carrier is a train of pulses rather than a continuous signal. In PAM, the amplitude of the rectangular pulse train is varied according to the instantaneous value of the modulating signal. The pulses in PAM signal may be flat top type or natural type samples.