each frequency band is determined to affected by the noise when {HEAD ~ the absolute value} of the corrected real value is below {TAIL ~ a predetermined threshold value} 
is below
each frequency band is determined to affected by the noise when { HEAD ~ the absolute value } of the corrected real value is below { TAIL ~ a predetermined threshold value }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL