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