Data coding/decoding device and method

Details Data coding/decoding device and method Data coding/decoding device and method

1995-09-08

1997-07-22

Gaffin, Jeffrey A.

Coded data generation or conversion

Digital code to digital code converters

To or from code based on probability

341 51, 341 87, 341 59, H03M 720

Patent

active

056507836

ABSTRACT:
A device for coding a series of symbols based on a multi-level arithmetic coding scheme includes a coding unit for coding the symbols based on frequency of occurrence of the symbols and orders of the symbols according to the frequency of occurrence, a context holding unit for storing the frequency of occurrence and the orders, a context updating unit for updating the frequency of occurrence and the orders upon receiving a control signal, and a controlling unit for sending the control signal when one of the symbols is coded and a cumulative frequency is less than a predetermined value, wherein the cumulative frequency is a sum of the frequency of occurrence for all of the symbols.

REFERENCES:
patent: 4989000 (1991-01-01), Chevion et al.
patent: 5142283 (1992-08-01), Chevion et al.
patent: 5254990 (1993-10-01), Yoshida et al.
patent: 5357250 (1994-10-01), Healey et al.
patent: 5546080 (1996-08-01), Langdon, Jr. et al.
patent: 5550540 (1996-08-01), Furlan et al.

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