Television – Format – Including additional information
Patent
1997-06-24
1999-01-12
Kostak, Victor R.
Television
Format
Including additional information
348468, 348478, H04N 708
Patent
active
058596704
ABSTRACT:
Conventional teletext decoders only respond to teletext data lines in the vertical blanking interval of a television signal. The decoders erroneously respond to conventional full-channel teletext transmissions in which all lines of the television signal are used for teletext. The method in accordance with the invention transmits teletext pages in the vertical blanking interval of the television signal in a conventional manner. Additionally, pages are also transmitted in the active video interval. A supplemental page header in each active video interval is provided to prevent teletext rows in the vertical blanking interval from being interpreted as rows of a page which is transmitted in the active video interval.
REFERENCES:
patent: 4719510 (1988-01-01), Kinghorn
patent: 4953022 (1990-08-01), Bugg
patent: 5184220 (1993-02-01), Kinghorn
patent: 5355170 (1994-10-01), Eitz et al.
patent: 5585857 (1996-12-01), Van Gestel
patent: 5589886 (1996-12-01), Ezaki
EBU Interim Technical Document SPB 492 "Teletext Specification 625 Line Television Systems", Dec. 1992.
Kostak Victor R.
Rubin Steven S.
U. S. Philips Corporation
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