Data transmission

H - Electricity – 04 – L

Patent

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Details

H04L 12/16 (2006.01) H04N 7/26 (2006.01) H04W 4/00 (2009.01) H04N 7/24 (2006.01) H04N 5/00 (2006.01)

Patent

CA 2372228

A data transmission system (10) is provided for transmitting a data signal between a server (12, 14, 16, 18) and a communications terminal (20, 22) over a transmission link having a variable bandwidth. The data signal is a scalable compressed multimedia clip comprising a sequence of images. Each image has a base layer and a number of enhancement layers. To cope with variability in the bandwidth, the sequence is re-ordered so that the base layers have greater safety times than the enhancement layers. This allows all of the base layers to arrive in time to be played at the expense of the enhancement layers.

L'invention concerne un système de transmission de données (10) qui assure la transmission d'un signal de données entre un serveur (12, 14, 16, 18) et un terminal de communication (20, 22) sur une liaison à largeur de bande variable. Le signal de données est un signal écrêté multimédia comprimé variable comprenant une séquence d'images. Chaque image comporte une couche de base et un certain nombre de couches d'accentuation. Pour tenir compte de la variabilité de la largeur de bande, on réordonne la séquence pour que la couche de base dispose de temps de sécurité accrus par rapport aux couches d'accentuation. Cela permet aux couches de base de se présenter à temps pour être sollicitées aux dépens des couches d'accentuation.

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