An addressable cable television control-system controls television program and data signal transmission from a central station to a plurality of user stations. The data signals include both control and text signals in video line format which are inserted on the vertical interval of the television signals,...http://www.google.com/patents/US4862268?utm_source=gb-gplus-sharePatent US4862268 - Addressable cable television control system with video format data transmission
Addressable cable television control system with video format data transmission
