According to another embodiment, {TAIL ~ the filtering unit} is constructed as {HEAD ~ an infinite impulse response filter} 
According to another embodiment , { TAIL ~ the filtering unit } is constructed as { HEAD ~ an infinite impulse response filter }
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD