System for compressed storage of 8-bit ASCII bytes using coded s

Details System for compressed storage of 8-bit ASCII bytes using coded s System for compressed storage of 8-bit ASCII bytes using coded s

1981-12-31

1986-06-24

Thomas, James D.

Boots, shoes, and leggings

340347DD, G06F 3023, G06F 702, G06F 500, G06F 1300

Patent

active

045970572

ABSTRACT:
Standard ASCII coded text is divided into alpha, numeric, and punctuation tokens. Each token is converted to a string of four-bit nibbles. One nibble is coded to identify the type of token. Additional nibbles are coded to identify the location, if any, of a corresponding alpha or punctuation token in a global dictionary. If no corresponding alpha token is in the dictionary, an alpha token is divided into prefixed, suffixes, and a stem. The location of any prefixes in a table of prefixes, suffixes in a table of suffixes, and the number, and location of corresponding individual characters in a table, of the remaining stem are then coded and stored as part of the string of four-bit nibbles for the alpha tokens. Numeric tokens are stored as a string of four-bit nibbles in which the first nibble identifies the type of token, the next nibble the length, followed by a nibble for each of the digits.

REFERENCES:
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patent: 4241402 (1980-12-01), Mayper, Jr. et al.
patent: 4270182 (1981-05-01), Asija
patent: 4295124 (1981-10-01), Roybal
patent: 4327379 (1982-04-01), Kadakia et al.
patent: 4342085 (1982-07-01), Glickman et al.
patent: 4374625 (1983-02-01), Hanft et al.
patent: 4386416 (1983-05-01), Giltner et al.
patent: 4409621 (1983-10-01), Richards et al.
patent: 4417319 (1983-11-01), Morimoto et al.
"Text Compression Using a 4 Bit Coding Scheme", J. Pike, The Computer Journal, vol. 24, Nov. 4, 1981, copyright Heyden & Son, Ltd. 1981.

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