a first low pass filter coupled to said third signal and having as {TAIL ~ an output} {HEAD ~ a first filtered signal}, 
as
a first low pass filter coupled to said third signal and having as { TAIL ~ an output } { HEAD ~ a first filtered signal } ,
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH