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