Interactive television multicasting

H - Electricity – 04 – N

Patent

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H04N 7/173 (2006.01) H04N 5/00 (2006.01)

Patent

CA 2106828

Different components of television programs, such as the video and audio components or different time segments of the program, are assigned to different channels transmitted in the form of packetized digital information in at least one of the channels of a multi-channel cable television distribution system. A particular subscriber's converter is configured to receive a particular subset of program components by enabling the converter to receive the virtual channels carrying the components in such subset. An embodiment is disclosed in which different combinations of program segments are enabled for different subscribers. Another embodiment is disclosed in which the viewing of a program by multiple subscribers who begin viewing at different times is synchronized by using "filler" program segments having different lengths.

Système d'attribution de composantes d'émissions de télévision, les composantes vidéo et audio par exemple ou les différentes tranches horaires des émissions, à divers canaux constitués d'informations numériques transmises par paquets pour au moins l'une d'entre elles, ces canaux faisant partie d'un système de télédistribution multi-chaîne. Le cablosélecteur d'un abonné particulier est conçu dans ce système pour recevoir un sous-ensemble donné de composantes d'émission grâce à sa capacité de recevoir les canaux virtuels associés aux composantes en question. On présente une configuration de ce système permettant à divers abonnés d'obtenir diverses combinaisons de segments d'émission. On présente également une configuration permettant, à l'aide de segments d'émission de remplissage de diverses longueurs, de synchroniser la transmission d'une même émission à plusieurs abonnés commençant à la regarder à différentes heures.

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