In an adaptive filter, {HEAD ~ an estimated wraparound speech signal ai d′} is generate from {TAIL ~ the speech signal} “ai d” subject to delay processing 
is generate from
In an adaptive filter , { HEAD ~ an estimated wraparound speech signal ai d′ } is generate from { TAIL ~ the speech signal } “ ai d ” subject to delay processing
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH