| 摘要 |
A method and apparatus, for arithmetically encoding input data, initialize a codeword table with K codewords, K being an integer greater than 1 and a probability value being assigned to each codeword. First to Mth symbols are extracted from the input data and M codewords are generated based thereon, with M being an integer representing a maximum length of codewords to be registered. First L symbols of the extracted M symbols are allocated with a probability of a longest registered codeword, wherein the longest registered codeword is the same as the first L symbols and L is an integer greater than 1. Then, the generated codewords except for the registered codewords are registered at the codeword table and probability values are reassigned to the registered codewords. After registering a predetermined number of codewords, the remaining symbols are sequentially allocated with the probability values of the corresponding registered codewords. A decoding method and apparatus perform the above steps reversely in order to decode the encoded data.
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