PCR_PID [MPEG-2 Semantics]
The PCR_PID is the packet id where the program clock reference for a program service can be found. The program clock reference is used to reconstruct the 27 Mhz system time clock (STC) in the receiver, which is used to synchronize audio, video and data demodulation.
The PCR_PID field in an ATSC Service location descriptor that gives the packet id of the Program Clock reference for the referenced program service
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