Method and apparatus for adaptive data compression
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United States of America Patent
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Nov 4, 1997
Grant Date -
N/A
app pub date -
Dec 6, 1994
filing date -
Dec 6, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention relates to data compression systems and methods wherein text can be compressed by encoding repetitions of blocks of characters, or through a straight encoding scheme that converts eight-bit character values to four-bit character values by eliminating values for characters that are not valid word-starting characters or valid next-letter characters for a given preceding letter. Block compression is accomplished through the use of data structures that track the successive occurrence of valid block-repetition starting characters, and their lengths. Repeat-relative block compression is accomplished by detecting character sequences that can be expressed as the value of a previously-occurring character sequence plus or minus an offset.
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