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