France Telecom

Other

Telediffusion De France

Etablissement Public De Diffusion Dit 'telediffusion De France'

Catherine Roux

Jean-Claude Rahuel

Dominique Curet

Stephanie Relier

Bernard Lorig

Antoine Maisonneuve

A method and apparatus are provided for the dynamic multiplexing of digital streams which are transmitted in the form of stream units in one channel, each of said stream units bearing a stream identifier which can be used to associate same with the corresponding digital stream. The allocation of an identifier to a digital stream is defined by an allocation table and can vary over time, in such a way as to enable dynamic multiplexing. The aforementioned allocation table bears a version number and, in order to indicate that a change in the version of the allocation table applies to a given digital stream, a burst is transmitted with at least one version change stream unit comprising the current identifier of said digital stream, an indicator which can be used to determine if the stream unit is a version change stream unit and the version number becoming applicable to said digital stream.

System for the dynamic multiplexing of digital streams

The process concerns the plotting of overextending curves inside a limited display window, with cutting-off of the parts of the curve which extend beyond the imposed display window. The goal is to provide a process for the plotting of overextending curves inside a display window, which optimizes calculation time and plotting time. This goal is achieved by means of a process characterized in that it manages a first process for plotting, applicable to the portions of curves (55) inscribed inside the window, and a second distinct process for processing of the overextending parts (54) of the curve, in that the processing of the overextending parts consists in optimizing travel (51, 52, 53) along the projection of the overextending parts on the window border (X.sub.max, Y.sub.max), and in that the said processing process is entirely executed within the plotting process, and in the course of the plotting of the curve.

Process and circuitry for implementing plotting of overextending curves

The present invention relates to a device for the digital transmission and display of graphics and/or of characters on a screen, the device comprising a terminal connected to a transmission network, to a graphic acquisition device and to a unit for display on a screen. Each terminal comprises a storage unit which, according to the invention, comprises a plurality of storage assemblies validatable in parallel, each storage assembly comprising a circuit effecting a logic combination between an input word and the word already written at the address indicated. The invention is more particularly applicable to the production of telewriting systems or of combined systems of telewriting and videotext (viewdata).

Device for the digital transmission and display of graphics and/or of

Growing community of inventors

Rennes, France

Catherine Roux