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Data Compression
  • The process of reducing (a) bandwidth, (b) cost, and (c) time for the generation, transmission, and storage of data by employing techniques designed to remove data redundancy.
  • The use of techniques such as null suppression, bit mapping, and pattern substitution for purposes of reducing the amount of space required for storage of textual files and data records. (FP) (ISO) Note: Some data compaction methods employ fixed tolerance bands, variable tolerance bands, slope-keypoints, sample changes, curve patterns, curve fitting, floating-point coding, variable precision coding, frequency analysis, and probability analysis. (Simply squeezing noncompacted data into a smaller space, e. g. , by transferring data on punched cards onto magnetic tape, is not considered data compression. ) Synonym data compaction. See also concentrator, data, data transmission, redundancy.