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Data preliminary compressed device and data preliminary compressed system and data compression ratio improvement manner
Data preliminary compressed device and data preliminary compressed system and data compression ratio improvement manner
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机译：数据初步压缩装置及数据初步压缩系统及数据压缩率的提高方式
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摘要
A data compression/decompression system employs two stages of data compression. Information and/or character data is first formatted into M-bit width digital data characters for input to the first stage of the data compression system which comprises an expanding run length encoder (63) having N-bit width output character where NM and the number of M-bit width characters is greater than the number of N-bit width characters. The output of the expanding run length encoder (63) is applied directly to a compatible adaptive string matching second stage data compression encoder (65) of the type which is not degraded or affected by the input. When the input data stream to the two stage system is not of a known format or provided with leader or header bit character width information, a bit analyzer (54) and a chopper (59, 61) are provided in the data stream to prepare the data stream in a bit character width format which matches the input of the expanding run length encoder (63).
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