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