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