The second circuit stage determines a one fourth amplitude value by adding the first amplitude value to {TAIL ~ the one half amplitude value} and dividing the result by two, and determines a three fourths amplitude value by adding the second amplitude value to {HEAD ~ the one half amplitude value} and dividing the result by two 
The second circuit stage determines a one fourth amplitude value by adding the first amplitude value to { TAIL ~ the one half amplitude value } and dividing the result by two , and determines a three fourths amplitude value by adding the second amplitude value to { HEAD ~ the one half amplitude value } and dividing the result by two
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH