Digital video programme multiplexing device

H - Electricity – 04 – N

Patent

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Details

H04N 7/58 (2006.01) H04N 7/50 (2006.01)

Patent

CA 2208432

A device for transmitting a number of video programmes over a transmission channel having a predetermined throughput capacity, including, for each programme channel supplying a multiplexer, a video encoder having a frame-by-frame programmable encoding throughput. The device comprises, on each programme channel, a frame store (20) with a capacity of at least one frame positioned upstream from the programmable encoder (16), and an auxiliary encoder (22) receiving a series of input frames one frame ahead of the the first encoder. Means (26) for comparing the qualities of the frames encoded by the auxiliary encoders with one another or with a reference value control the encoding throughput to balance the output qualities of the various encoders.

Le dispositif d'émission de plusieurs programmes vidéo sur un canal de transmission ayant une capacité de débit déterminée, comprend, pour chaque voie de programme alimentant un multiplexeur, un codeur vidéo ayant un débit de codage programmable trame par trame. Il comporte sur chaque voie de programme, une mémoire d'image (20) ayant une capacité d'au moins une trame, placée en amont du codeur programmable (16), et un codeur auxilaire (22) recevant les trames d'entrée successives, avec une trame d'avance sur le premier codeur. Des moyens (26) de comparaison de la qualité des trames codées par les codeurs auxilaires, entre elles ou avec une référence, commandent le débit de codage pour équilibrer les qualités des sorties des différents codeurs.

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