| 摘要 |
A system and method uses the closed captioning script to synchronize supplemental data with specified junctures in a video program. A parser parses the closed captioning script to identify a set of unique phrases, with each phrase having the same number of words. A program producer decides what points in the video program to introduce enhancing content. The producer associates supplemental data used to activate the enhancing content with specific key phrases of the closed captioning script that correspond to the desired points in the program. The parser creates a key phrase data file which contains a listing of the key phrases and their association to the supplemental data. The key phrase data file is delivered to viewer computing units at users' homes. When the program is played, the viewer computing unit monitors the closed captioning script to detect the key phrases listed in the key phrase data file. Upon detection of a particular key phrase, the viewer computing unit accesses the key phrase data file to retrieve the supplemental data associated with the particular key phrase. The viewer computing unit executes an enhancement action according to the supplemental data to synchronize the enhancement action with the video program. According to one implementation, the key phrase detector multicasts the enhancement action to a multicast address. A listener in the form of an ActiveX(TM) control listens to the multicast address to receive and handle any enhancement action supported by the supplemental data. The listener can be embedded in a container, such as an HTML page or other hypermedia document.
|
