Matra Communication

Jean Mary

Jean-Michel Masson

The method is for generating a digital multiplex signal for broadcasting. The multiplex is made up of packets of determined length coming from a plurality of sources, by applying a treatment selected from those belonging to a catalog of stored treatments. It is applicable to D2-MAC/packet and digital TV. An encoder implementing the method has sources in which the identity of the treatment to be performed is inserted in a field provided for this purpose in each packet precursor. Downstream from the sources, the encoder comprises a treatment unit for decoding the field and for causing the treatment defined by the field to be applied.

Method of making up a digital multiplex, and apparatus implementing said

A X-MAC encoder enables a plurality of components to be encoded, each having a sequence of packets, with the packets being distributed in successive bursts each occupying a predetermined fraction of a television frame line. It comprises a plurality of blocks each having at least one packet encoder provided with a buffer memory for storing digital data coming from a source, and an encoder for distributing the packets in bursts of adjustable duration not greater than the duration of one television line. A base encoder assembly contains a programmable device for allocating a determined window of the television frame to each block. It calls a burst of length corresponding to the width within the window that is allocated by the programmable device, on the basis of the respective block burst encoder, at the beginning of each window in a line.

Modular encoder for generating a digital multiplex signal and decoder

The multiplexing device is for insertion of digital packets, supplied by several different sources, in a same transmission channel having an average data rate at least equal to the sum of the average data rates supplied by the sources. It comprising a packet call input unit connected to the transmission channel. The sources are cascaded and the downstream source constitutes an interface towards the input unit. Each source comprises a generator of an insertion priority order for each packet as a function of the type of packet, of the number of stored packets, and of insertion rules associated with the type of packets to be transmitted. Each cascaded source, with the exception of the most upstream source, has a routing circuit supplying at its output the highest priority among the two priorities applied to its input, and of which one corresponds to the source itself and the second to the upstream unit.

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Orsay, France

Jean Mary