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