A second set of narrowband signals may then be recovered from {HEAD ~ the second set} of {TAIL ~ sampled signals} 
A second set of narrowband signals may then be recovered from { HEAD ~ the second set } of { TAIL ~ sampled signals }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL