A wraparound delay amount detecting part calculates a cross correlation r from an output speech signal “ai” supplied to a loudspeaker and an input speech sigal “bi” inputted through a microphone array to obtain {HEAD ~ a delay amount “d}” of {TAIL ~ a wraparound speech signal} 
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A wraparound delay amount detecting part calculates a cross correlation r from an output speech signal “ ai ” supplied to a loudspeaker and an input speech sigal “ bi ” inputted through a microphone array to obtain { HEAD ~ a delay amount “ d } ” of { TAIL ~ a wraparound speech signal }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL