Cursor controlled page selection in a video display

Details Cursor controlled page selection in a video display Cursor controlled page selection in a video display

1983-04-07

1986-05-06

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

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

340709, 340710, G09G 116

Patent

active

045875200

ABSTRACT:
A teletext system in which viewer function selection is accomplished by superposing a cursor on one of the displayed function words. The teletext/videotext receiver includes a ROM for storing page selection control symbols and a RAM for storing symbols and related addresses corresponding to all displayed page selection symbols. The RAM contents are compared with a cursor address signal to identify displayed page selection symbols that are at or near the cursor location. A page selection symbol, thus identified, is transferred from the RAM to the teletext/videotext system decoder as an information selection command in response to depression of a selection key whereby a minimum number of keys provide selection of a virtually unlimited number of system commands and a user may continuously monitor the displayed text while making selections thus reducing selection entry errors. Provision is made for altering the cursor position, shape and/or brightness upon a predetermined condition of proximity of the cursor with respect to a displayed system command symbol to verify the validity of the command to the user and to avoid positional ambiguities of the cursor relative to the displayed symbol.

REFERENCES:
patent: 3482241 (1969-12-01), Johnson
patent: 4028695 (1977-06-01), Saich
patent: 4167729 (1979-09-01), Christenson et al.
patent: 4213189 (1980-07-01), Mueller et al.
patent: 4232311 (1980-11-01), Agneta
patent: 4354184 (1982-10-01), Worborschil
patent: 4479197 (1984-10-01), Haag et al.
patent: 4495491 (1985-01-01), Postl

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