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