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Method-of-transmitting-teltext-pages-including-an-index-table-with-a-code-for-selecting-particular-and-common-extension-pages-to-enhance-basic-pages

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Method of transmitting teltext pages including an index table with a code for selecting particular and common extension pages to enhance basic pages

Details

Inventors: Van Gestel, Henricus A. W.;
Assignee: U.S. Philips Corporation (New York, NY)
Primary Examiner: Peng; John K.
Assistant Examiner: Miller; John W.
Attorney, Agent or Firm: Treacy; David R.

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.

DETAILED DESCRIPTION I claim: 1.
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.
2.
A method as claimed in claim 1, characterized in that said bit is in the most significant bit position of each said code.
3.
A method as claimed in claim 2, characterized in that said multibit value occupies the three next-most-significant bit positions of each said code.
4.
A method as claimed in claim 3, characterized in that transmission of said predetermined one extension page comprises transmitting extension signals which are common for a plurality of basic pages.
5.
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.
6.
A method as claimed in claim 5, characterized in that said given position is the most significant bit position of each said code.
7.
A method as claimed in claim 6, characterized in that said multibit value occupies the three next-most-significant bit positions of each said code.
8.
A method as claimed in claim 7, characterized in that transmission of said predetermined extension page comprises transmitting extension signals which are common for a plurality of basic pages

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