The receipt time is used for estimating program clock reference adjustments, but {HEAD ~ final program clock reference adjustment} is performed in {TAIL ~ hardware} in relation to the precise output timing of each transport packets 
is performed in
The receipt time is used for estimating program clock reference adjustments , but { HEAD ~ final program clock reference adjustment } is performed in { TAIL ~ hardware } in relation to the precise output timing of each transport packets
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH