Variable length encoding/decoding apparatus using re-association

Details Variable length encoding/decoding apparatus using re-association Variable length encoding/decoding apparatus using re-association

1995-11-27

1999-12-07

Tokar, Michael

Coded data generation or conversion

Digital code to digital code converters

To or from variable length codes

341 51, H03M 740

Patent

active

059991119

ABSTRACT:
A variable length encoding/decoding apparatus using symbol-codeword re-association of a variable length code table includes a re-associator for storing symbol-address assignment information, address-codeword assignment information and address-counter-value assignment information, altering the symbol-address assignment information and the address-counter value assignment information according to the varied counter value due to the symbol identifying and outputting a variable length code table in which a symbol-codeword is re-associated to the encoder/decoder apparatus, and a controller for producing the initialized counter values based on probabilities of symbol occurrences belonging to the pre-defined variable length code table and the information stored in the re-associator based on the pre-defined updating unit, and storing the symbol-codeword re-associated variable length code table every predetermined updating unit in the encoder/decoder. A data compression efficiency can be improved even though global statistics corresponding to the pre-defined variable length code table and local statistics of the symbols/codewords which are actually variable-length-encoded/decoded do not match each other. Since it is not necessary to transmit the symbol-codeword re-association information at the encoding end to a decoding end, threre is no additional data to be transmitted by employing the present invention.

REFERENCES:
patent: 4486784 (1984-12-01), Abraham et al.
patent: 4700175 (1987-10-01), Bledsoe
patent: 5086439 (1992-02-01), Asai et al.
patent: 5235623 (1993-08-01), Sugiyama et al.
patent: 5392038 (1995-02-01), Bhandari et al.

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