CLOCK RECOVERY USING REMOTE ARRIVAL TIMESTAMPS

摘要

Methods and systems may provide for a sink module that receives packets from a source module, wherein each of the packets has a source timestamp corresponding to a source module packet arrival time. A reference timestamp may be associated with the source timestamp of the most recent packet having a program clock reference. A sink counter may be synchronized to a broadcaster transmit counter based on a current source timestamp and the reference timestamp. The sink counter and the source counter may be driven by asynchronous clocks, wherein the current source timestamp may be inferred based on a current value of the source counter. The packets may include video data and/or audio data. The sink counter may be synchronized by adjusting the frequency of a source clock and/or adjusting the sink counter.

主权项

1. A system comprising:
a broadcast head-end; a source module including:
a source input to receive a plurality of packets from the broadcast head-end;a source counter incremented by a source clock; anda timestamper to add a source timestamp to each of a plurality of packets based on the source counter; and a sink module including:
a sink input to receive the plurality of packets from the source module;a reference timestamp module to associate as a reference timestamp, the source timestamp of the most recent packet in the plurality of packets having a program clock reference;a sink counter incremented by a sink clock; anda synchronization module to synchronize the sink counter to a broadcaster transmit counter using a current source timestamp and the reference timestamp.