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