Lignes Telegraphiques Et Telephoniques

Lignes Telegraphiques Et Telephoniques-l.t.t.

Claude Gourdon

Maurice Niquel

Jean Thivend

Jean Rouxel

A synchronization device for digital data frame transmission system comprising an n bit series register transferring its contents at the line frequency to a parallel register also of n bits. The m first bits of the series register are also directed to a logic circuit which tests their conformity with the beginning of the synchronization word. When there is conformity, the logic circuit controls a divider dividing by n which controls, in its turn, at the line frequency divided by n, the transfer of the contents of the parallel register to a PROM memory. The purpose of the PROM is to recognize the entire synchronization word. When there is no recognition, the operation of the divide by n divider is inhibited and the procedure begins again.

Synchronization device for digital frame transmission

A process and system are provided for transmitting additional information, called order track, superimposed on the information to be transmitted, by alteration of the coding law. The process involves:

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Conflans Ste Honorine, France

Claude Gourdon