According to {HEAD ~ at least one preferred embodiment}, the filtering unit is constructed as {TAIL ~ a finite impulse response filter} 
According to { HEAD ~ at least one preferred embodiment } , the filtering unit is constructed as { TAIL ~ a finite impulse response filter }
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL