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US 2002/0154640 A1Published application
Method of clock mismatch and drift compensation for packet networks
AssigneeOptibase Ltd.
InventorLi Wei
Life of this patent
Estimating the term…
Abstract
Using the method of the present invention, clock mismatch or drift between a packet network transmitter and receiver can be compensated for via receiver clock rate change or bit rate change. The method includes estimating the average receiver FIFO buffer memory level over time, changing the packet network receiver bit rate or clock rate according to the average receiver FIFO buffer memory level change while still satisfying the MPEG-2 system specification.
Claims3
A method for correcting the clock in an digital video data stream transmitted in packets over a network, said method comprising the steps of:
- a. placing said video packets in an output FIFO memory;
- b. outputting data from said output FIFO according to a clock rate or bit rate that is adjustable;
- c. filtering the level of data in said output FIFO to produce a current average level and a previous average level;
- and
- d. changing said adjustable clock rate or bit rate according to said current average level and said previous average level;
- whereby said output FIFO level is driven towards a predetermined target level.
3 more elements
Dependencies are inferred from the claim text.