Clock-slaving in a programmable video recorder

Details Clock-slaving in a programmable video recorder Clock-slaving in a programmable video recorder

2007-08-07

2007-08-07

Tran, Thai Q. (Department: 2621)

Motion video signal processing for recording or reproducing

Local trick play processing

With randomly accessible medium

C386S349000, C386S349000, C348S423100

Reexamination Certificate

active

10206158

ABSTRACT:
According to one embodiment, a Programmable Video Recorder (PVR) receives streaming multimedia data from a data source and stores the multimedia data in a backing store. Prior to being stored, the multimedia data is assigned Presentation TimeStamps (PTS)s according to a capture graph clock that is associated with the PVR. Thereafter, system clock times that correspond with the times in which each data packet is read from the backing store are compared with the corresponding PTSs of each data packet to generate a clock scaling value that is used to slave the system clock with the capture graph clock. The clock scaling value may include the average of a plurality of scaling values that are calculated during a predetermined duration of time corresponding with the most recently read data packets.

REFERENCES:
patent: 6363207 (2002-03-01), Duruoz et al.
patent: 6587635 (2003-07-01), Subramanian et al.
patent: 6611624 (2003-08-01), Zhang et al.
patent: 6766407 (2004-07-01), Lisitsa et al.
patent: 6801709 (2004-10-01), Park
patent: 7030812 (2006-04-01), Bekritsky et al.

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