Device and method for concealing an error

H - Electricity – 03 – M

Patent

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Details

H03M 13/03 (2006.01) H03M 13/41 (2006.01) H04L 1/22 (2006.01) H04N 7/68 (2006.01)

Patent

CA 2482866

A device for concealing an error in an erroneous or potentially erroneous informa-tion unit generates output values of a forward decoder (14) and a backward decoder (16) which differ and thus indicate an error-concealment area (18). The different values for one and the same information unit are examined with regard to a predetermined criterion so as to select that value (22) which meets the predetermined criterion, i.e. which is plausible. Thus, an elimination or reduction of the continuation errors introduced in the decoding of blocks of reversible code words of variable lengths is achieved without impacting the compression rate.

L'invention concerne un dispositif de masquage d'une erreur dans une unité d'information défectueuse ou potentiellement défectueuse. Ledit dispositif produit des valeurs de sortie d'un décodeur aval (14) et d'un décodeur amont (16) différentes les unes des autres, et indiquant ainsi une zone de masquage d'erreur (18). Les différentes valeurs d'une même unité d'information sont examinées au sujet d'un critère prédéfini afin de choisir la valeur (22) remplissant le critère prédéfini, c.-à-d. la valeur qui est plausible. Ainsi, il est possible d'éliminer ou de réduire les erreurs de poursuite créées lors du décodage de blocs constitués de mots code réversibles de longueur variable, sans avoir d'effet sur un taux de compression.

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