Video information transmission service system and head end device therefor

摘要

A video signal coordination system which enables selective transmission of video signals from a plurality of sources with simpler digital switching systems which require fewer cross points and thus reduce the cost of the overall system. For each of a plurality of video source groups, an associated digital switching system is provided, so that the overall number of switching systems is equal to the number of video source groups. Queuing problems are avoided by having some duplication of video sources across various ones of the video source groups.