Teletext receiver with page up and page down functions

Details Teletext receiver with page up and page down functions Teletext receiver with page up and page down functions

1988-05-12

1989-06-06

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358147, H04N 708

Patent

active

048376205

ABSTRACT:
A teletext system with multiple page teletext memory includes a page up and a page down function. Upon direct access of a page of teletext data, appropriate flags are set in the sector memory and the preceding page of data and the four successive pages of data are also acquired and stored. Corresponding page numbers are placed in the page request register and in response to a page up or page down command, a display register is incremented or decremented, respectively, to display the next page of data. The high page and low page information is recalculated by the CCU and the teletext system acquires a new page of teletext data to replace a page that is being discarded. Should a page request be made via the up/down page commands for a page that has not been completely acquired, the system reverts to a direct access mode of operation and the cycle is repeated.

REFERENCES:
patent: 4679083 (1987-07-01), Schmitz et al.
patent: 4701794 (1987-10-01), Froling et al.

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