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