| 摘要 |
Video content is transmitted from a head end, over a switched digital video content-based network, to a client. The head end obtains a first group of program streams and sends to the client only a subset of the program streams selected by subscribers in a neighborhood of the client. The video content is contained in a given one of the subset of the program streams and the client is tuned to a channel corresponding to the given one of the subset of the streams. The supplemental information is transmitted from the head end, over the switched digital video content-based network, to the client, based upon the channel to which the client is tuned. The video content and the supplemental information can both be sent on an identical carrier frequency corresponding to the channel; they may employ an identical quadrature amplitude modulation scheme, and the video content can be broken into packets identified via a first packet identifier, with the supplemental information broken into packets identified via a second packet identifier.
|
