a processing device that processes said digital input signal and determines a digital output signal, including converting {HEAD ~ the digital input signal} from {TAIL ~ a time domain} into a frequency domain; and 
from
a processing device that processes said digital input signal and determines a digital output signal , including converting { HEAD ~ the digital input signal } from { TAIL ~ a time domain } into a frequency domain ; and
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH