Teletext interface for digital storage medium having synthetic v

Details Teletext interface for digital storage medium having synthetic v Teletext interface for digital storage medium having synthetic v

1981-06-04

1983-07-12

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340728, 340745, 340700, 178 30, 358 1, G09G 116

Patent

active

043933769

ABSTRACT:
A teletext interface is coupled between a television receiver and a medium storing a plurality of digitally encoded signals each representing a selected text/graphics character intended for transmission as a corresponding synthetic video signal during the active scanning intervals of a television signal. The teletext interface includes a ROM for converting each of the digitally encoded signals to a teletext encoded signal representing a corresponding text/graphics character and apparatus for inserting the teletext encoded signals as a plurality of teletext formated data rows in successive teletext lines of the television signal. A television receiver including a built-in teletext decoder is responsive to the teletext formated data rows for displaying the selected text/graphics characters in a high quality form while a standard receiver is responsive to the synthetic video signal for displaying the characters in a poorer quality form.

REFERENCES:
patent: 3222452 (1965-12-01), Banning, Jr.
patent: 3553676 (1971-01-01), Raciti
patent: 3624632 (1971-11-01), Ophir
patent: 3891792 (1975-06-01), Kimura
patent: 3961324 (1976-06-01), Cousin et al.

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