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