US 4,290,062 AGranted

System for digital transmission and text display

AssigneeEtablissement Public de Diffusion dit "Telediffusion de France"

InventorsBernard Marti, Alain Poignet, Jean-Yves Savary, Roger Brusq

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Abstract

A system for transmission and display of texts on a television screen enables a display of a magazine made up of several pages. The packets of data relative to one page are transmitted without being multiplexed with the packets from another page of the same magazine. The data of one page begins with a page flag which is followed by data indicating the number of the page and ends with the flag of the following page. The data from each page is grouped in rows, preceded by a row flag. Each page contains an order row of the data which is operation data and is not used for display. Certain pages contain only the data which is relative to the shape of characters of the alphabet and the pages are not for display. They include in their order rows a specific operation octet which is recognized in the receiver. Responsive to this page, the system switches the subsequent data from the alphabet page towards the writing circuit of one of many shape memories, in order to record there the character shape data.

Claims13

Dependent claims

A system for transmission and display of text material on a television screen, wherein the transmitting television station broadcasts data for such displays in the form of data packets sent out over several channels, the packets from the different channels being adapted to be time multiplexed, a series of packets from any one channel constituting a magazine made up of several pages, the packets relative to any one page being transmitted without being multiplexed with the packets from another page one page including an order row of data which is purely operational data that is not used for display, and character shape format control means for use in said system, said character shape format means comprising:

a plurality of shape memory means for recording the character shapes transmitted by the system, said one of said pages of transmitted data containing exclusively data relating to the shapes of alphabet characters on the alphabet page which is not for display means for switching the subsequent data of that alphabet page toward a writing circuit, means associated with one of the shape memory means in order to record there the character shape data, and character generator means responsive to said recorded character shape data for generating alphabetical character of a shape selected from said page which is not for display.

Dependencies are inferred from the claim text.