| 摘要 |
A device for transcoding coded digital signals which are representative of a sequence of images, which device comprises a variable length decoding channel (12) followed by a variable length encoding and decoding channel (13), is described. According to the invention, a prediction sub-assembly (140) is connected in cascade between these two channels, and this sub-assembly comprises, in series, between two subtracters (114, 45), a picture memory (41) and a circuit (42) for motion compensation in view of displacement vectors which are representative of the motion of each image. Other implementations are possible, and particularly a scalable one in which said prediction sub-assembly comprises at least two and more generally a plurality of similar encoding and decoding channels arranged in cascade and corresponding to the same number of image quality levels.
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