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