{HEAD ~ The squared signal} is integrated over {TAIL ~ a period} related to the frequency fm to provide a dc signal 
is integrated over
{ HEAD ~ The squared signal } is integrated over { TAIL ~ a period } related to the frequency fm to provide a dc signal
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH