Video transmission of multiple program signals with encoded...

H - Electricity – 04 – N

Patent

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H04N 7/58 (2006.01)

Patent

CA 2392546

The invention concerns the control of Asynchronous Transfer Mode (ATM), or other systems, using available bit rate (ABR) transmission. A source of data is permitted to transmit at a data rate which is set by the network according to the available capacity. Where television pictures are being transmitted, the actual data rate can be controlled by varying the degree of compression applied by video coder (or transcoder). Existing procedures for dividing up the available capacity between competing video sources are found to be unsatisfactory in terms of achieving equal picture quality for each source. In the invention, each source calculates a measure of picture complexity, and the network (for example, an ATM switch) uses the means to calculate how the capacity should be shared.

Cette invention a trait à la commande d'un système à mode de transfert asynchrone (MTA) ou d'autres systèmes utilisant une transmission à débit binaire disponible. Une source de données est mise en mesure de transmettre à un certain débit binaire établi par le réseau en fonction de la capacité disponible. Lors de la transmission d'images télévisuelles, il est possible de commander le débit binaire réel par modification du degré de compression appliqué par le codeur vidéo (ou le transcodeur). Les modes opératoires existants permettant de diviser la capacité disponible entre des sources vidéo concurrentes se sont révélés insatisfaisants s'agissant d'atteindre une qualité égale d'image pour chaque source. Dans le cadre de cette invention, chaque source calcule une mesure de complexité d'image et le réseau (par exemple, un réseau de connexion MTA) utilise un dispositif lui permettant de calculer comment partager la capacité disponible.

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