US Patent No: 4,587,520

Number of patents in Portfolio can not be more than 2000

Cursor controlled page selection in a video display

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Abstract

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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.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
RCA CORPORATIONNEW YORK, NY16

International Classification(s)

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  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Astle, Brian Cranbury, NJ 40 2215

Cited Art Landscape

Patent Info (Count) # Cites Year
 
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* Cited By Examiner

Patent Citation Ranking

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