a wraparound delay amount detecting part for comparing an output speech signal supplied to the loudspeaker with {HEAD ~ a wraparound speech signal} contained in {TAIL ~ an input speech signal} inputted through the microphone array, and detecting a delay amount of the wraparound speech signal contained in the input speech signal delayed from the output speech signal; and 
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a wraparound delay amount detecting part for comparing an output speech signal supplied to the loudspeaker with { HEAD ~ a wraparound speech signal } contained in { TAIL ~ an input speech signal } inputted through the microphone array , and detecting a delay amount of the wraparound speech signal contained in the input speech signal delayed from the output speech signal ; and
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 REL REL 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH