The delay processing part generates {HEAD ~ a speech signal “ai d}” obtained by delaying {TAIL ~ the output speech signal} “ai” by the delay amount “d” 
obtained by delaying
The delay processing part generates { HEAD ~ a speech signal “ ai d } ” obtained by delaying { TAIL ~ the output speech signal } “ ai ” by the delay amount “ d ”
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH