Text compression and expansion method and apparatus

Details Text compression and expansion method and apparatus Text compression and expansion method and apparatus

1986-12-04

1989-06-27

Shoop, Jr., William M.

Coded data generation or conversion

Digital code to digital code converters

Coding by table look-up techniques

341 90, 364200, 364900, H03M 742

Patent

active

048433896

ABSTRACT:
A text compression method and apparatus are disclosed that enable overall compression ratios of more than six or eight to one for normal language text. Plural multiple-word dictionaries that are specialized for the particular field of use are employed together with a header transmission format that identifies which dictionaries are to be used. In addition, entries in these dictionaries are categorized by a weighted frequency of use ranking in which the product of the word length in characters and the frequency of occurrence of that word in the text is taken as the weighted figure of merit for ranking words to be placed in the individual dictionaries.

REFERENCES:
patent: 3348205 (1967-10-01), Lee
patent: 4295124 (1981-10-01), Roybal
patent: 4386416 (1983-05-01), Giltner et al.
patent: 4545032 (1985-10-01), Mak
patent: 4597057 (1986-06-01), Snow
patent: 4646061 (1987-02-01), Bledsoe
Rubin, Experiments in Text File Compression, Communications of the ACM, 11/1976, vol. 19, No. 11, pp. 617-623.
Weiss et al, Journal of Library Automation, vol. 11, No. 2, 6/1978, pp. 97-105.
Datran, Inc. Publication, Modem Accelerator Multifunction Board, 1985, 2 pages.

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