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