Method and device for securely transmitting teletext pages to sp

Details Method and device for securely transmitting teletext pages to sp Method and device for securely transmitting teletext pages to sp

1996-05-29

1998-10-13

Flynn, Nathan J.

Television

Two-way video and voice communication

User positioning

348468, 348552, 348563, H04N 714

Patent

active

058219820

ABSTRACT:
In interactive teletext, an individual user establishes a connection (6) with a central computer (14). Requested information is applied to a television transmitter (12) via a teltext inserter (11) and transmitted to the user as personal teletext pages for display on the user's receiver (3). However, other users (4) may be "co-viewers". In accordance with the invention, each personal page is transmitted with a teletext page number P and a sub-code S. Subsequently, a pseudo-page having the same page number P but a different sub-code S' is transmitted. Consequently, the personal page appears on the display screen of the co-viewer's receiver (4) only for a short time.

REFERENCES:
patent: 4538174 (1985-08-01), Gargini et al.
patent: 5337155 (1994-08-01), Cornelis

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