Method of transmitting teltext pages including an index table with a code for selecting particular and common extension pages to enhance basic pages
AssigneeU.S. Philips Corporation
InventorHenricus A. W. Van Gestel
Life of this patent
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Abstract
Teletext page signals are transmitted in a format providing basic pages and extension pages, and a table which includes a code for indexing extension pages to the basic pages with which they are to be used. The code includes a multibit value for selecting an extension page from a list, and a single bit for selecting or not selecting a predetermined common extension page. Each extension page includes signals for enhancing the basic page or pages to a higher level display.
Claims15
A method of transmitting teletext pages including a plurality of basic pages and an extension page for enhancing said basic pages, characterized in that the method comprises the step of transmitting a list of extension pages and a table of codes, wherein each code links one of said basic pages to at least one selected extension page, and each code comprises a bit for linking said basic page to a predetermined one of said list of extension pages, and a multibit value identifying a further one of said list of extension pages.
A method of transmitting teletext pages including a plurality of basic pages and an extension page for enhancing said basic pages, comprising the step of transmitting a table of codes for linking one of said basic pages to said extension page,
- characterized in that said method further comprises transmitting a plurality of said extension pages, said plurality including a predetermined extension page, and
- in said step of transmitting a table of codes each code comprises a single bit in a given position for selectively linking said one of said basic page to said predetermined extension page, and a multibit value for identifying a further extension page.
A transmission station for transmitting teletext pages including a plurality of basic pages and an extension page for enhancing said basic pages, comprising means for transmitting a table of codes for linking one of said basic pages to said extension page,
- characterized in that said station further comprises means for transmitting a plurality of said extension pages, said plurality including a predetermined extension page, and
- said means for transmitting a table of codes transmits in each code a single bit in a given position for selectively linking said one of said basic page to said predetermined extension page, and a multibit value for identifying a further extension page.
A teletext receiver for teletext pages including a plurality of basic pages and an extension page for enhancing said basic pages, comprising means for receiving and decoding a table of codes for linking, for each of said plurality of basic pages, one of said extension pages to the respective basic page,
- acquisition means for acquiring at least one of said basic pages and extension pages linked thereto, and
- display means for displaying said one basic page in conformity with signals which are accommodated in the basic page and the extension page linked thereto,
- characterized in that said receiver further comprises means, responsive to a single bit in a given position of the respective code, for selectively linking said one basic page to said predetermined extension page, and responsive to a multibit value in the respective code for identifying a further extension page.
Dependencies are inferred from the claim text.