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1. 发明授权

US6167048A Clock recovery for video communication over ATM network 失效
标题翻译：通过ATM网络进行视频通信的时钟恢复
公开(公告)号：US6167048A
公开(公告)日：2000-12-26
申请号：US921553
申请日：1997-09-02
申请人： Randy A. Law , Neil B. Cox , Edwin L. Froese
发明人： Randy A. Law , Neil B. Cox , Edwin L. Froese
IPC分类号： H04J3/06 , H04L7/06 , H04L12/70 , H04N19/61 , H04J3/14 , H04L7/00
CPC分类号： H04L12/5601 , H04J3/0664 , H04L2012/5674
摘要： A method of clock recovery from a fast packet switched asynchronous network wherein a time stamp is transmitted over a network that has variable delay, involves maintaining an input counter at a sending device. The counter has a value dependent on an input clock. The value of the input counter is periodically transmitted over the network to a receiving device. A local counter at a receiving device has a value dependent on a local clock. The received value sample x.sub.i is compared with the local sample y.sub.i to derive the difference e.sub.i. The local clock frequency f.sub.j is adjusted such that the average of Emin.sub.j, where Emin.sub.j is the minimum of a block of error samples e.sub.i, remains close to a predetermined value, preferably zero. The clock recovery method is particularly suitable for MPEG2 video transmitted over ATM.
摘要翻译：一种从快速分组交换异步网络进行时钟恢复的方法，其中时间戳通过具有可变延迟的网络发送，包括在发送设备处维护输入计数器。计数器的值取决于输入时钟。输入计数器的值通过网络周期性地发送到接收设备。接收设备的本地计数器具有取决于本地时钟的值。将接收到的值样本xi与局部样本yi进行比较以得出差异ei。调整本地时钟频率fj，使得Eminj的平均值，其中Eminj是误差样本ei的块的最小值，保持接近预定值，优选为零。时钟恢复方法特别适用于通过ATM传输的MPEG2视频。

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