Synchronization and automation in an ITV environment

Details Synchronization and automation in an ITV environment Synchronization and automation in an ITV environment

2011-08-30

2011-08-30

Trost, IV, William (Department: 2421)

Interactive video distribution systems

User-requested video program system

Video-on-demand

C725S135000, C348S460000, C348S461000, C348S464000

Reexamination Certificate

active

08010986

ABSTRACT:
A synchronization mechanism embeds synchronization triggers into a television signal or stream at regular intervals. The triggers include an accurate representation of the time in which the triggers were embedded. A receiving device decodes the triggers and synchronizes its internal timer based on the triggers. In this regard, the receiving device obtains a reference time from the internal timer and computes an offset between the reference time and the trigger time. The computed offset is then applied to the reference time. With the receipt of each new trigger, the application compares the trigger time to a new reference time with the most recently computed offset value applied. If there is any variance between these two values, the application creates a new smoothed offset.

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