Clock recovery for video communication over ATM network

Details Clock recovery for video communication over ATM network Clock recovery for video communication over ATM network

1997-09-02

2000-12-26

Pham, Chi H.

Multiplex communications

Pathfinding or routing

Switching a message which includes an address header

375362, 348501, 370508, H04J 314, H04L 700

Patent

active

061670480

ABSTRACT:
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.

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