Coded data generation or conversion – Digital code to digital code converters – To or from variable length codes
Patent
1994-03-17
1996-04-23
Hoff, Marc S.
Coded data generation or conversion
Digital code to digital code converters
To or from variable length codes
341106, 341 65, H03M 740
Patent
active
055107850
ABSTRACT:
Generating a plurality of tables based on a condition series, such as non-zero coefficient size groupings, by repeatedly executing an operation in which the quantization step of a quantizer is controlled by supplying the total code word length generated by a variable length coder to the quantizer. Coefficient data is coded by selecting a table based on a preceding condition series and the current condition series is coded based on the selected table. Thus, the total code word length is decreased. The coding apparatus includes a Huffman table generating apparatus, a transform circuit, a quantizer, and a variable length coder having a memory for storing the Huffman tables for every condition series.
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Kitamura Takuya
Murakami Yoshihiro
Segawa Kazuko
Segawa Yoshihisa
Frommer William S.
Hoff Marc S.
Sinderbrand Alvin
Sony Corporation
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