To recover the amplitude information, the receiver section includes {HEAD ~ an amplitude detector} such as {TAIL ~ an envelope detector}, a low pass filter, etc 
To recover the amplitude information , the receiver section includes { HEAD ~ an amplitude detector } such as { TAIL ~ an envelope detector } , a low pass filter , etc
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH