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