| 摘要 |
Entropy encoders and decoders employ an entropy-pump operation. The entropy-pump operation includes classifying blocks of the input sequence's symbols in accordance with the probabilities of occurrence of those blocks' values. Entropy coding an output component that represents the sequence of classes to which the blocks belong tends to be profitable, because that component has an entropy density less than that of the input sequence, hi contrast, little opportunity for compression tends to be lost by not entropy encoding an output component that represents the values of the blocks that belong to single class, because those values' probabilities of occurrence are similar.
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