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