Coding system

Details Coding system Coding system

1994-01-13

1995-04-04

Logan, Sharon D.

Coded data generation or conversion

Digital code to digital code converters

To or from code based on probability

341 51, H03M 734

Patent

active

054041406

ABSTRACT:
A coding system comprises the comparing circuit which compares a magnitude of the range on the number line which is allocated to the most probability symbol with a magnitude of the fixed range on the number line which is allocated to the Less Probability Symbol. If the range allocated to the MPS is smaller than that to the LPS, and when the symbol is the MPS, the range allocated to the LPS is generated. If the range allocated to the MPS is smaller than that to the LPS, and when the symbol is the LPS, the range allocated to the MPS is generated. By the system, a coding efficiency is improved especially when a probability of occurrence of LPS (Less Probability Symbol) is approximate to 1/2.

REFERENCES:
patent: 4191974 (1980-03-01), Ono et al.
patent: 5057917 (1991-10-01), Shalkauser
patent: 5059976 (1991-10-01), Ono et al.
W. B. Pennebaker, J. L. Mitchell, G. G. Langdon, Jr. R. B. Arps, "An Overview of the Basic Principles of the Q-Coder Adaptive Binary Arithmetic Coder," pp. 717-726, IBM J. Res. Develop. vol. 32, No. 6, Nov. 1988.

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