| 摘要 |
PURPOSE: A method for multiple-extracting universal variable length codeword and a method for constructing a look-up table therefor are provided to speed up an extracting process by extracting a plurality of codewords at the same time. CONSTITUTION: The size of unit data to be processed in a bit stream at a time is set. An index is granted to the current unit data selected among the bit stream. All codewords are extracted from the current unit data, and the length from a first bit to a final bit in the rest of the bits is defined as a suffix-length. A binary value of the bit corresponding to the suffix-length is defined as a suffix-value. The length from a most significant bit to an extension bit of the codeword belonging to the previous unit data is defined as a prefix-length. A binary value of the bit corresponding to the prefix-length is defined as a prefix-value. The number of extractable codewords is defined as a number-of-codewords. The length and a binary value of each codeword are defined as codeword-lengths and codeword-values. The defined suffix-length, suffix-value, prefix-length, prefix-value, number-of-codewords, codeword-lengths and codeword-values are recorded at corresponding fields(21,22,23,24,25,26) of the index. |
