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