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