Tv set top box using gps

G - Physics – 01 – S

Patent

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Details

G01S 5/14 (2006.01) H04N 7/167 (2006.01) H04N 7/16 (2006.01)

Patent

CA 2220035

An integrated receiver decoder (IRD) (37), commonly called a set-top box, has a global positioning system (GPS) receiver (42). The GPS receiver checks to see if the IRD is at an authorized location and allows descrambling of video signals only if the location is authorized. A central access control system (Fig. 1), remote from the customers/viewers, has a high quality GPS receiver (16) and sends some GPS data in the transmission medium used to send video signals to the customers. This GPS data, referred to herein as indirect GPS data, is used by the IRD such that it requires less complexity than otherwise. The IRD introduces a pseudo-random time delay (56) in generating certain signals such that spoofing (i.e. providing phony signals to the IRD) is much more difficult. Various components of the IRD are in a common sealed container such as an integrated circuit or a smart card such that tampering with the components and spoofing are more difficult.

Décodeur (37) intégré à un récepteur de télévision (IRD) et comportant un récepteur (42) GPS qui vérifie si l'IRD est ou non dans un lieu autorisé et ne permet le débrouillage des signaux vidéo que si c'est le cas. Un système central de contrôle des accès (fig 1) distant du client/téléspectateur, muni d'un récepteur GPS (16) de haute qualité, émet certaines données GPS sur un moyen de transmission servant à l'émission des signaux vidéo à destination des clients. Les données GPS, qu'on dira ici indirectes, sont traitées par l'IRD plus simplement qu'auparavant. Lors de la production de certains signaux l'IRD introduit un délai pseudo-aléatoire (56) rendant beaucoup plus difficile la fraude par transmission de signaux trompeurs à l'IRD. Plusieurs des composants de l'IRD sont logés dans un boîtier commun fermé, circuit intégré ou une carte à puce, pour rendre plus difficile le bricolage des composants et les fraudes.

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