利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

13 条记录 (耗时 0.017 秒)

    System and method for high precision clock recovery over packet networks
    9.
    发明授权
    System and method for high precision clock recovery over packet networks 失效
    通过分组网络高精度时钟恢复的系统和方法

    公开(公告)号：US08416814B2

    公开(公告)日：2013-04-09

    申请号：US12705660

    申请日：2010-02-15

    申请人： Alon Shtern ,  Alex Tal ,  Guy Kronenthal ,  Raz Korn ,  Ziv Barak ,  Osnat Shasha

    发明人： Alon Shtern ,  Alex Tal ,  Guy Kronenthal ,  Raz Korn ,  Ziv Barak ,  Osnat Shasha

    IPC分类号： H04J3/06

    CPC分类号： H04L12/66 ,  H04J3/0664 ,  H04L65/80 ,  H04L69/28

    摘要： An improved system and method for achieving high precision clock recovery, i.e. reconstruction of the clock signal having the same frequency, over a packet switched network. The proposed method utilizes a minimum network delay approach, which overcomes the problems caused by delay variation of the network and filters out network jitter, such as noise jitter and other “singular” anomalies causing latency deviations. Minimum network delay is defined herein as the time delay in which a packet remains in the network under assumption that all transmission queues through which the packet passes are empty. The proposed system and method perform clock recovery by including an improvement in the form of dynamically varying thresholds. Reconstruction of the clock signal is performed in accordance with the minimum network delay estimation based on an adjustable threshold, i.e., the latency change threshold, which increases when the noise threshold increases and decreases when the noise threshold decreases. This allows detection of latency changes in accordance with the dynamically varying network conditions and avoids false latency change detections.

    摘要翻译： 一种用于实现高精度时钟恢复的改进的系统和方法，即通过分组交换网络重建具有相同频率的时钟信号。 所提出的方法采用最小网络延迟方法，克服了由网络延迟变化引起的问题，并滤除了网络抖动，如噪声抖动和引起延迟偏差的其他奇异异常。 在这里将最小网络延迟定义为假设分组通过的所有传输队列为空的分组保留在网络中的时间延迟。 所提出的系统和方法通过包括动态变化阈值形式的改进来执行时钟恢复。 根据基于可调阈值的最小网络延迟估计来执行时钟信号的重建，即，当噪声阈值降低时，当噪声阈值增加时减小的等待时间变化阈值增加。 这允许根据动态变化的网络条件检测等待时间变化并避免错误的等待时间变化检测。