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    • 9. 发明申请
    • CLOCK RECOVERY METHODS AND APPARATUS
    • 时钟恢复方法和装置
    • WO2005071871A1
    • 2005-08-04
    • PCT/US2005/000867
    • 2005-01-12
    • INTEL CORPORATIONSTEPHENS, Adrian, P.LOUKIANOV, Dmitrii
    • STEPHENS, Adrian, P.LOUKIANOV, Dmitrii
    • H04J3/06
    • H04B7/269
    • A source application executed within a source device may packetize and send source data over a link to a destination application executed within a destination device. In various embodiments, clock recovery processes are performed in conjunction with the destination application in order to synchronize the rates of source data production and consumption (e.g., playback). To facilitate the clock recovery process, a transport delay is calculated based on the difference between a source MAC-layer timestamp and a destination MAC-layer timestamp that envelop portions of the link that include variable delay elements. The transport delay is used by the clock recovery process to adjust a source application-layer timestamp, in one embodiment. In another embodiment, the transport delay is used by the destination device to impart a fixed cumulative transport delay on the source data before it is delivered to the destination application.
    • 在源设备中执行的源应用可以通过链路将源数据分组化并发送到目的地设备内执行的目的地应用。 在各种实施例中,时钟恢复过程与目的地应用一起执行,以便同步源数据生成和消耗(例如,回放)的速率。 为了便于时钟恢复过程,基于包含可变延迟元素的链路的部分的源MAC层时间戳和目的MAC层时间戳之间的差异来计算传输延迟。 在一个实施例中,时钟恢复过程使用传输延迟来调整源应用层时间戳。 在另一个实施例中,目的地设备使用传输延迟来在源数据被传递到目的地应用之前对源数据赋予固定的累积传输延迟。