Abstract: A system for the transmission of digital data elements corresponding to at least one application each comprising at least one stream of data elements, the data elements being constituted by digital elements distributed in the time-frequency space and transmitted in the form of symbols constituted by a multiplex of orthogonal carrier frequencies modulated by a set of the digital elements and broadcast simultaneously, the symbols being organized in successive frames, each frame being organized in at least one data conveying channel, each channel being constituted by a succession of at least one consecutive symbol. The data elements may advantageously be transmitted, in each channel, either in transparent mode or in packet mode.

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.