PROCEDE PERMETTANT LA MISE EN CASCADE DE MODULES D'ACCES CONDITIONNEL DETACHABLES, CIRCUIT D'INSERTION D'UNE SEQUENCE PREDEFINIE ET CIRCUIT DE DETECTION DE LADITE SEQUENCE POUR LA MISE EN OEUVRE DU PROCEDE

摘要

The method involves use of a number of modules, with each module is traversed by a data stream of fixed length packets. The sequence is an increasing or decreasing set of binary data with a defined value which is identical at the beginning of all the packets. An insertion circuit receives the original stream and the predefined sequence from a generator. A detector determines the beginning and end of the packet and allows selection at the output of the multiplexer of one or other inputs. The generator has a counter and a memory containing the sequence in successive addresses, with the address incremented each clock octet and returned to the beginning at the end of each packet.