A transmitting apparatus for an interactive communication system using a broadcast wave, which includes a first storage unit, a second storage unit, and a transmitting unit. The first storage unit stores a plurality of frames of image data. The second storage unit stores control information which shows...http://www.google.de/patents/US5973681?utm_source=gb-gplus-sharePatent US5973681 - Interactive data communication system with unidirectionally transmitted broadcast wave
