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