Television schedule information transmission and utilization systems
transmit TV schedule data and associated network control messages
provided by computer as packets via the Video Blanking Interval (VBI)
lines in the TV signal from various television program providers. This
data is acquired by regional data processing systems and forwarded by the
regional data processing systems to subscriber units and used to
construct an internal database. This internal database can be accessed by
the subscriber unit to display a TV schedule for the channels that are
received by the user's TV.