a wraparound delay amount detecting part for comparing {HEAD ~ an output speech signal} supplied to {TAIL ~ the loudspeaker} with a wraparound speech signal contained in 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 
supplied to
a wraparound delay amount detecting part for comparing { HEAD ~ an output speech signal } supplied to { TAIL ~ the loudspeaker } with a wraparound speech signal contained in 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 HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH