A system for composing multimedia signals from various source signals, such as still-frame video signals, full motion video signals and audio signals includes a plurality of composing units, each of which is capable of composing a multimedia signal from selected source signals. One of such composing...http://www.google.de/patents/US5570126?utm_source=gb-gplus-sharePatent US5570126 - System for composing multimedia signals for interactive television services
