Data compressing apparatus, data restoring apparatus and recordi

Details Data compressing apparatus, data restoring apparatus and recordi Data compressing apparatus, data restoring apparatus and recordi

1996-11-12

1998-09-22

Hoff, Marc S.

Coded data generation or conversion

Digital code to digital code converters

Coding by table look-up techniques

341 50, H03M 730

Patent

active

058120769

ABSTRACT:
A data compressing apparatus is capable of executing a data compression at a high speed and a high compression rate. A data restoring apparatus is used in combination with the data compressing apparatus. The data compressing apparatus incorporates code tables used for respective contexts and a device for determining whether the code table contains a character an occurrence probability of which exceeds 50%. If the character (MPS) with its occurrence probability of over 50% exists in a first code table when coding a certain character, the data compressing apparatus creates an extension code table in which respective codes are made corresponding to a character string of two characters starting with the MPS and to the respective characters excluding the MPS within the first code table based on the first code table and one other code table.

REFERENCES:
patent: 5045852 (1991-09-01), Mitchell et al.
patent: 5357250 (1994-10-01), Healey et al.
patent: 5381145 (1995-01-01), Allen et al.
patent: 5574449 (1996-11-01), Golin
patent: 5650783 (1997-07-01), Murashita et al.
patent: 5710562 (1998-01-01), Gormish et al.
patent: 5717394 (1998-02-01), Schartz et al.

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