Discussion
Why does a pulse position demodulator often convert back to width modulation first?
Answer: A
Because the average value of a width-modulated train is proportional to the message, a low-pass filter finishes the job, whereas position pulses are all identical and their average carries nothing. The bandwidths are comparable, synchronisation is still needed to define the slots, and position pulses amplify perfectly well. Converting into the form whose demodulator is trivial, rather than building a harder demodulator, is a recurring move in pulse circuit design.
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