Method and device for transcoding a sequence of coded digital si

Details Method and device for transcoding a sequence of coded digital si Method and device for transcoding a sequence of coded digital si

1995-06-29

1998-03-17

Au, Amelia

Television

Bandwidth reduction system

Data rate reduction

348409, H04N 736

Patent

active

057292930

ABSTRACT:
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.

REFERENCES:
patent: 5270812 (1993-12-01), Richards
patent: 5287420 (1994-02-01), Barrett
patent: 5291283 (1994-03-01), Kondo et al.
patent: 5294974 (1994-03-01), Naimpally et al.
patent: 5510787 (1996-04-01), Koster

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