Satellite direct radio broadcast system

H - Electricity – 04 – J

Patent

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Details

H04J 4/00 (2006.01) H04B 1/06 (2006.01) H04B 7/185 (2006.01) H04B 7/204 (2006.01) H04K 1/04 (2006.01) H04L 5/02 (2006.01) H04L 5/26 (2006.01) H04L 25/14 (2006.01) H04H 1/00 (2006.01)

Patent

CA 2238641

A satellite direct audio broadcast system includes a plurality of fixed-rate, uniform, frequency division multiple access ("FDMA") uplinks (21) and a time division multiplexed ("TDM") downlink (27). Source audio channels may be divided among and transmitted through a selectable number of fixed-rate uplinks so as to have selectable audio quality at the receiver. fixed-rate FDMA uplinks include information designating related channels as containing related source information. On-board the satellite baseband processing selects uplink information channels for inclusion into none, one or multiple TDM downlinks. Transmitted audio information may be scrambled, and authorization downloaded to receivers to permit descrambling for paid subscription service.

Système de radiodiffusion audio directe par satellite. Comprend un certain nombre de liaisons ascendantes (21) AMRF (accès multiple par répartition en fréquence) uniformes à débit fixe et une liaison descendante (27) MRT (multiplexage par répartition dans le temps). Les canaux audio sources peuvent être divisés entre un nombre sélectionnable de liaisons ascendantes à débit fixe de manière à permettre la sélection de la qualité audio au niveau du récepteur. Les liaisons ascendantes AMRF à débit fixe comprennent de l'information désignant les canaux connexes qui contiennent de l'information de source connexe. € bord du satellite, un traitement en bande de base sélectionne les canaux d'information de liaison ascendante à inclure dans une ou de multiples liaisons descendantes MRT, ou à n'inclure dans aucune de ces liaisons. Il est possible d'embrouiller l'information audio transmise et de transmettre aux récepteurs l'autorisation de désembrouillage pour le service payable par abonnement.

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