Which of the following system is an analog modulation system?

Question

Question

Answer 1

CONCEPT:

Analog modulation is a process in which analog low-frequency baseband signals (like an audio or TV signal) are transmitted over a larger distance without getting faded away, by superimposing over a higher frequency carrier signal such as a radio frequency band.

EXPLANATION:

F1 P.Y Madhu 9.03.20 D6

The full form of PWM is pulse width modulation or pulse-duration modulation (PDM).
It is a useful analog modulation system.
It is a process in which output signals of low frequency are generated from the input pulse of high frequency.
In analog modulation, if the amplitude of a pulse or duration of a pulse is varied according to the instantaneous values of the baseband modulating signal, then such a technique is called Pulse Amplitude Modulation (PAM) or Pulse Duration/Width Modulation (PDM/PWM), or Pulse Position Modulation (PPM).

So, the correct answer is option 4.