Modified huffman encode/decode system with simplified decoding f

Details Modified huffman encode/decode system with simplified decoding f Modified huffman encode/decode system with simplified decoding f

1991-09-30

1993-07-13

Logan, Sharon D.

Coded data generation or conversion

Digital code to digital code converters

To or from number of pulses

341106, H03M 740, H03M 742

Patent

active

052277895

ABSTRACT:
The K most frequently occurring symbols in an image represented by an alphabet of N symbols are mapped to a set of K codewords. The length of each codeword is an inverse function of the frequency of occurrence of the corresponding symbol in the image and the longest codeword is of length d bits. The remaining N-K symbols are mapped in order of their magnitude to a set of supplementary codewords of a uniform maximum length D bits. The d most significant bits of each supplementary codeword form a prefix which is uniform within each set and specifies whether the corresponding symbol is positive or negative. The remaining or least significant D-d bits of each supplementary codeword comprise a suffix and are mapped in order of bit position to progressively more narrow ranges of symbol values of the remaining N-K symbols.

REFERENCES:
patent: 3883847 (1975-05-01), Frank
patent: 4044347 (1977-08-01), Van Voorhis
patent: 4488143 (1984-12-01), Martin
patent: 4580129 (1986-04-01), Bahgat
patent: 4969204 (1990-11-01), Melnychuck et al.
Michael Hankamer, "A Modified Huffman Procedure with Reduced Memory Requirement", IEEE Transactions on Communications, Jun. 1979, vol. Com-27, No. 6, pp. 930-932.

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