Simultaneously transporting multiple mpeg-2 transport streams

Details Simultaneously transporting multiple mpeg-2 transport streams Simultaneously transporting multiple mpeg-2 transport streams

H - Electricity

04

N

H04N 7/50 (2006.01) H04N 7/173 (2006.01) H04N 7/52 (2006.01)

Patent

CA 2528608

Methods and apparatus are provided for sending multiple MPEG transport streams over an interface, between, e.g., a host set top box (STB) and an endpoint device such as an access control device (ACD). The addition of a multi-byte field consisting of Transport ID (TSID), Packet ID (PKTID), Cyclic Redundancy Check (CRC) bits, Local Time Stamp etc. to an MPEG-2 transport stream makes possible simultaneous transfer of multiple transport streams through high speed isochronous transfers using only one transmit and one receive pipe. Use of only one transmit and one receive pipe causes less CPU loading and offers better bandwidth utilization by causing much less overhead on the bus compared to using multiple transmit and receive pipes.

L'invention concerne des procédés et un appareil d'envoi de flux multiples de transport MPEG sur une interface, entre, par exemple, un boîtier de décodeur hôte (STB) et un dispositif à un point terminal tel qu'un dispositif de commande d'accès (ACD). L'ajout d'un champ multi-octet constitué d'un ID de transport (TSID), d'un ID de paquet (PKTID), de bits de contrôle par redondance cyclique (CRC), d'un horodateur local, etc. à un flux de transport MPEG-2 rend possible le transfert simultané de flux de transport multiples par des transferts isochrones à grande vitesse à l'aide d'un seul canal de transmission et d'un seul canal de réception. L'utilisation d'un seul canal de transmission et d'un seul canal de réception réduit la charge de l'UC et offre une meilleure utilisation de la largeur de bande du fait d'une bien moindre surcharge sur le bus comparée à l'utilisation de canaux de transmission et de réception multiples.

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