Efficient transcoding device and method

H - Electricity – 03 – M

Patent

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H03M 7/00 (2006.01) H04B 14/06 (2006.01) H04N 7/26 (2006.01)

Patent

CA 2154885

The present invention provides a transcoder (400) for transcoding of digitally encoded bit streams produced by predictive encoders. The transcoder of this invention is less complex than previously known transcoders in terms of both computational and storage requirements. This efficiency is achieved by combining decoding and re-encoding steps into one step. This one-step transcoding is accomplished by modifying the originally quantized vectors and then requantizing and noiseless encoding these vectors into a bit stream in accordance with a predetermined objective (1200).

La présente invention concerne un transcodeur (400) pour transcoder des trains de binaires codés numériquement, produits par des codeurs à prédiction. Le transcodeur selon la présente invention est moins complexe que les transcodeurs connus dans l'art antérieur en termes d'exigences de calcul et de mémorisation. Cette efficacité est assurée par la combinaison des étapes de décodage et de re-codage en une seule étape. Ce transcodage en une seule étape est réalisé en modifiant les vecteurs initialement quantifiés, puis en les requantifiant et en codant sans bruit ces vecteurs en un train de binaires en fonction d'un objectif prédéterminé (1200).

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