Television – Nonpictorial data packet in television format – Data format
Patent
1994-12-12
1996-10-15
Metjahic, Safet
Television
Nonpictorial data packet in television format
Data format
348468, H04N 7087
Patent
active
055659276
ABSTRACT:
Teletext page signals are transmitted in a format providing only basic characters and colors, along with extension signals enlarging the character set, colors, and other presentation information which is used by decoders and display systems having more extensive capabilities. Decoders ignore extension signals intended for a higher level display than the associated apparatus. A code is added identifying the level of display for which extension signals are intended, so that extension signals can be transmitted for use only by a display of a given capability, without undesired use by a higher level display.
REFERENCES:
patent: 4337485 (1982-06-01), Chambers
patent: 4698677 (1987-10-01), Kinghorn et al.
patent: 4908707 (1990-03-01), Kinghorn
patent: 4910595 (1990-03-01), Bugg et al.
patent: 4933764 (1990-06-01), Kinghorn
patent: 4953022 (1990-08-01), Bugg
patent: 5355170 (1994-10-01), Eitz et al.
J. P. Chambers, "Potential of extended teletext", Journal of the Royal Television Society, Sep./Oct. 1980, pp. 43-45.
"Teletext Specification (625 line television systems)", Interim Technical Document SPB 492, European Broadcasting Union, Dec. 1992, Geneva, pp. 1-140.
Metjahic Safet
Treacy David R.
U.S. Philips Corporation
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