Transcoding device with information signal transmission

H - Electricity – 03 – M

Patent

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Details

H03M 7/00 (2006.01) H04N 7/12 (2006.01) H04N 7/26 (2006.01) H04N 7/30 (2006.01) H04N 7/36 (2006.01) H04N 7/50 (2006.01)

Patent

CA 2128793

Known transcoders for compressed video signals comprise a decoder and a coder coupled thereto, between which a data signal is transmitted. Because compressed video signals comprise so-called difference pictures and normal pictures, both the decoder and the coder should have a feedback loop which is utilized in decoding and coding a difference picture and is not utilized in decoding and coding a normal picture. For example, for the purpose of prediction means (motion compensation and motion estimation) present in the feedback loop of the coder, much computation has to be carried out in the coder. The computation required is considerably reduced by con-comitantly transmitting one or more information signals in addition to the data signal in a transcoder according to the invention, and complete decoding and complete coding no longer takes place.

Les transcodeurs de signaux vidéo comprimés courants sont constitués d'un codeur et d'un décodeur couplés l'un à l'autre entre lesquels un signal de données est transmis. Étant donné que ces signaux correspondent à des images de différence et des images normales, ce codeur et ce décodeur doivent être dotés d'une boucle de rétroaction utilisée pour le décodage et le codage des images de différence, mais non utilisée pour le décodage et le codage des images normales. Par exemple, pour les dispositifs de prédiction (correction des effets dus aux mouvements et détermination des mouvements) présents dans la boucle de rétroaction du codeur, une grande quantité de calculs doit être effectuée dans le codeur. Dans le transcodeur de l'invention, on peut réduire considérablement la quantité des calculs requis en transmettant de façon concomitante un ou plusieurs signaux d'information en plus du signal de données, éliminant ainsi le décodage et le codage complets.

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