Fast extraction of program specific information from...

H - Electricity – 04 – N

Patent

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Details

H04N 7/08 (2006.01) H04N 7/50 (2006.01) H04N 5/44 (2006.01) H04N 5/00 (2006.01)

Patent

CA 2247450

A digital TV receiver suffers from latency when a channel change is made to a program in an other than the currently accessed transport stream (TS). That is because the transport decoder (202) must first acquire and decode the Program Specific Information (PSI) from the transport stream, such as the Program Association Table and Program Map Table. In accordance with the invention, a pre-decoder (203) is successively coupled to the other transport streams through a cross bar switch (204) to extract the PSI from said other streams and create a map of channels.

Un téléviseur numérique souffre de temps de latence lorsque l'on change de chaîne pour passer à une autre une émission dans un flux de transport autre que celui en cours d'utilisation (TS), du fait que le décodeur de transport (202) doit d'abord acquérir et décoder les informations spécifiques à l'émission (PSI) provenant du flux de transport, telles que la table d'association d'émissions et la table de mappage d'émissions. Selon l'invention, un pré-décodeur (203) est couplé successivement à d'autres flux de transport par l'intermédiaire d'un commutateur crossbar (204) de sorte que le PSI soit extrait desdits autres flux et qu'une mappe de canaux soit créée.

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