means for sampling the n outputs at {HEAD ~ a specified time} relative to {TAIL ~ the sample clock pulse} to produce the n samples 
relative to
means for sampling the n outputs at { HEAD ~ a specified time } relative to { TAIL ~ the sample clock pulse } to produce the n samples
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH