SYSTEM FOR DYNAMIC REAL-TIME TELEVISION CHANNEL EXPANSION

摘要

A system wherein a single active video signal (Vi) along with a plurality of audio (A1--An) and still frame graphics (G1--Gn) signals representing non-active video are transmitted to a receiving site (170) where they are combined as virtual channels to represent a number of different screens of a TV set (175, 175'). The system uses only the bandwidth of a single television channel to provide a viewer with a plurality of screens. At least one of the screens displays the active video signal. Other screens can display non-active video such as text/graphics and/or data. Audio can accompany any screen display. This multiple-screen capability is provided by transmitting a mapping function as a separate signal independent of the video signal to create an effective plurality of virtual channels that can be dynamically switched to time share the active video signal.