Digital signal broadcasting

H - Electricity – 04 – L

Patent

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Details

H04L 12/56 (2006.01) H04N 7/50 (2006.01)

Patent

CA 2182455

A distribution network groups television program signals into service tiers. To provide these from unsynchronized MPEG streams without resynchronization, each stream, representing a single program signal is encapsulated into ATM cells with a virtual path(VP) identification of each ATM cell corresponding to the service tier and a virtual channel (VC) identification corresponding to the respective program signal. Payloads in cells having the same VP are scrambled using a scrambling key allocated to that VP and hence to the corresponding service tier, and are unscrambled by entitled subscribers using the scrambling key which is supplied to them individually using public/private encryption techniques.

Dans un réseau de distribution de programmes de télévision, les signaux sont groupés en groupes de service. Pour transmettre ces signaux sans resynchronisation au moyen de chaînes MPEG non synchronisées, chaque chaîne représentant un signal de programme particulier est encapsulée dans les cellules MTA avec un identificateur de trajet virtuel pour chaque cellule MTA correspondant au groupe de service et un identificateur de canal virtuel correspondant au signal de programme particulier. Les charges des cellules ayant le même trajet virtuel sont brouillées au moyen d'une clé de brouillage attribuée au trajet virtuel en question et, par voie de conséquence, au groupe de service correspondant, et sont débrouillées par les abonnés autorisés au moyen de la clé de brouillage qui leur est fournie individuellement par les méthodes de chiffrement publiques/privées.

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