Question

Which of the following statement is true about pulse position modulation system?

(a) pulses have constant width but varying amplitude

(b) pulses have constant amplitudes and constant widths

(c) pulses have constant amplitude but varying widths

(d) pulses have varying width and varying amplitude

I had been asked this question during an interview.

My enquiry is from Comparision of SSB Suppression Techniques topic in portion SSB Modulation of Analog Communications

Answer 1

Right option is (b) pulses have constant amplitudes and constant widths

The best explanation: Pulse Position Modulation (PPM) is a type of modulation process in which  position of the pulse of the carrier wave is varied with respect to the instantaneous position values of the message signal. In pulse modulation, pulses have constant amplitude and widths.