wherein {HEAD ~ an output speech signal} of {TAIL ~ the delay processing part} is inputted to the estimated wraparound speech signal generating part as an input signal 
of
wherein { HEAD ~ an output speech signal } of { TAIL ~ the delay processing part } is inputted to the estimated wraparound speech signal generating part as an input signal
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH