System for modifying the time-base of a video signal

Details System for modifying the time-base of a video signal System for modifying the time-base of a video signal

2011-03-01

2011-03-01

Pappas, Peter-Anthony (Department: 2481)

Motion video signal processing for recording or reproducing

Local trick play processing

With randomly accessible medium

C386S349000

Reexamination Certificate

active

07899302

ABSTRACT:
A storage device500includes an input405for receiving a digital video stream complying with a predetermined video encoding standard via a digital video communication system. The stream includes a sequence of digital video frames, a sequence of program clock reference stamps (PCR) and a sequence of video presentation time stamps (PTS). A time-base modifier510replaces the PTS's by respective modified video presentation time stamps (M-PTS) based on a constant predetermined frame time between successive presentation time stamps and replaces the PCR's by respective modified program clock reference stamps (M-PCR) by scaling the PCR's using a scaling factor that depends on a ratio of an expected time between a video presentation time stamp j and a preceding video presentation time stamp j−n and an actual time between the video presentation time stamp j and the preceding video presentation time stamp j−n, where j≧n>0. The expected time is n times the predetermined frame time.

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