Information Technologies and Computer Engineering

The lossless methods of data compression, based on the truncation of the same characters sequences in low, high, internal and low and high order positions are proposed. A characteristic feature of these methods is a partitioning of input data sequence into blocks and further processing at bit level that leads to decreasing their dependence on the type of data being processed. A software tool for the experimental investigation of the proposed methods is developed. The research results of the effectiveness of data compression with use of the file types *.doc, *.txt, *.bmp, *.gif, *.jpg, *.au, *.mp3, *.exe, *.mdb are presented

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