Which of the following components is required to detect (demodulate) Pulse Position Modulation (PPM)?
a) Pulse Generator
b) RS Flip-Flop
c) PWM Demodulator

Explanation:

Pulse Position Modulation (PPM) Demodulation

Pulse Position Modulation (PPM) is a type of signal modulation where the position of a pulse, relative to the position of a reference pulse, is varied according to the sampled value of the modulating signal. In simpler terms, the timing of the pulse is varied to encode the information.

In PPM, the position of each pulse is shifted in time to represent the data being transmitted. The time displacement of each pulse is proportional to the amplitude of the analog signal at the corresponding sampling time. To demodulate this signal, the receiver needs to be able to detect these time shifts accurately.

Components Required for PPM Demodulation:

To demodulate a PPM signal, the following components are typically required:

• Pulse Generator: Used to create reference pulses that help in determining the position of the incoming pulses.
• RS Flip-Flop: Helps in maintaining the state information needed for the timing and synchronization of the demodulated signal.
• PWM Demodulator: While not directly used for PPM demodulation, understanding Pulse Width Modulation (PWM) demodulation can be beneficial as PPM can be derived from PWM signals.

Correct Option Analysis:

The correct option is:

Option 4: Only c

This option correctly identifies that a PWM Demodulator (Option c) is required for the demodulation of PPM. The reasoning is that a PPM signal can be derived from a PWM signal. Therefore, understanding and utilizing a PWM demodulator is crucial for effectively demodulating a PPM signal