Coded data generation or conversion – Digital code to digital code converters
Patent
1995-12-22
1997-11-25
Gaffin, Jeffrey A.
Coded data generation or conversion
Digital code to digital code converters
341 51, 341 82, 341106, H03M 700
Patent
active
056917171
ABSTRACT:
A database record compression system compresses data with frequency priority. The system has a formal dictionary for storing compressed strings and entry numbers corresponding to the compressed strings. A temporary dictionary compresses and stores strings of the plurality of strings input from an input file which are not stored in the formal dictionary. The system initializes all entries of the temporary dictionary when a number of registrations in the temporary dictionary reaches a predetermined number of initializations. In the system, an occurred string is registered in the formal dictionary when a frequency of occurrence of the string at the temporary dictionary reaches a predetermined number of times.
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patent: 5455576 (1995-10-01), Clark, II et al.
Chang, D.K., Exact Data Compression Using Hierarchical Dictionaries, 1991 Data Compression Conference p. 431, Apr. 1991.
J. Ziv et al.; "Compression of Individual Sequences via Variable-Rate Coding"; IEEE Transactions on Information Theory, Vo. 1T-24 (1978); pp. 530-536.
Gaffin Jeffrey A.
NEC Corporation
Vick Jason H.
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