| 摘要 |
<p>A settop box can be connected to a DVD Streamer via an IEEE1394 interface which contains means to timestamp data and to strip off these timestamps again, using them for timing regeneration. The DVD Streamer also must regenerate the timing of data packets as it was upon recording, when these packets are played back. The settop box itself adds timestamps to the data packets before sending them through the IEEE1394 interface. These timestamps pass the IEEE1394 interface unnoticed, i.e. as part of the payload. These timestamps are used when the DVD streamer plays back a stream. The advantage is that there is only one timing/regeneration process involved and that no jitter is accumulated. As an alternative, the stream recorder uses the IEEE1394 timestamps and evaluates them when replaying in order to assign to the data packets the correct temporal position.</p> |
