Data coding apparatus and data decoding apparatus and methods th

Details Data coding apparatus and data decoding apparatus and methods th Data coding apparatus and data decoding apparatus and methods th

1996-12-02

1998-10-20

Young, Brian K.

Coded data generation or conversion

Digital code to digital code converters

Coding by table look-up techniques

H03M 700

Patent

active

058253157

ABSTRACT:
Data coding apparatus and decoding apparatuses to encode and decode data at a high speed. A data coding apparatus provided with a code table in which ranks and codes are made corresponding so that a code length becomes larger as the rank becomes lower. A rank holding unit is stored with a corresponding relationship between the character and the rank relative to each context. When the character to be encoded is input, the rank holding unit outputs a rank of that character relative to the context at that time, and the code corresponding to the rank within the code table is output by the rank coding unit. The data coding apparatus is constructed to change the rank of the character used for outputting within the rank holding unit up to a higher rank.

REFERENCES:
patent: 4612532 (1986-09-01), Bacon et al.
patent: 5537551 (1996-07-01), Denenberg et al.

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