Device and method for entropy encoding of information words...

H - Electricity – 03 – M

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H03M 7/40 (2006.01)

Patent

CA 2341864

A method and a device for entropy encoding and associated decoding make use of a code consisting on the one hand of a code table with reversible code words and comprising on the other hand an escape region for information words to be coded which are located outside the region defined by said code table. Said region can be selected in such a way that a major part of the information words is coded with symmetrical code words by the code table. On the one hand, it is thus possible to carry out, in addition to forward decoding, also backward decoding and on the other hand, use of reversible code words allows for rapid recognition of errors in a code word stream transmitted over a non-ideal channel.

L'invention concerne un dispositif et un procédé de codage entropique et de décodage correspondant. Selon l'invention, on utilise un code qui comprend d'une part un tableau de codage présentant des mots de code réversibles (12) et d'autre part une zone d'évitement pour les mots d'information à coder situés en dehors d'une plage (14) fixée par le tableau de codage. Cette plage peut être sélectionnée de sorte qu'une grande partie des mots d'information soit codée par l'intermédiaire du tableau de codage avec des mots de code symétriques. D'une part, il est ainsi possible d'effectuer non seulement un décodage sans voie de retour mais aussi un décodage avec voie de retour (24), et l'utilisation de mots de code réversibles permet, d'autre part, une reconnaissance rapide d'erreurs dans une suite de mots de code transmise dans un canal non idéal.

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