Compression of an electronic programming guide

H - Electricity – 03 – M

Patent

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Details

H03M 7/42 (2006.01) H04N 7/025 (2006.01) H04N 7/08 (2006.01) H04N 7/26 (2006.01) H04N 5/445 (2006.01) H04N 7/16 (2006.01)

Patent

CA 2222293

Television programming information comprising an electronic programming guide is compressed by more than fifty percent, and decompressed in environments with only moderate processing power and storage space. The coding scheme of the present invention is based on Huffman coding of characters comprising the electronic programming guide and replacement character strings occuring in the data that have high savings values. A look-up table and binary tree are constructed from the Huffman codes for use in compressing and decompressing the electronic programming guide, and a set-top box for use in the decompression operation is provided.

Des informations de programmation de télévision comprenant un guide de programmation électronique sont comprimées à plus de 50 %, puis décomprimées dans des milieux, dont la puissance de traitement et l'espace de mémorisation ne sont que modérés. Le système de codage décrit par l'invention est basé sur le codage de caractères de Huffman comprenant le guide de programmation électronique, ainsi que des chaînes de caractères de remplacement apparaissant dans les données possédant des valeurs élevées de sauvegarde. Une table et un arbre binaire sont construits à partir des codes de Huffman, afin d'être utilisés dans la compression et la décompression du guide de programmation électronique et un boîtier situé sur le sommet du téléviseur est utilisé dans l'opération de décompression.

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