In the three previous chapters it has been assumed that the probability distribution is fixed, and that both encoder and decoder share knowledge of either the actual symbol frequencies within the message, or of some underlying distribution that may be assumed to be representative of the message. While there was some discussion of alternative ways of representing the prelude in a semistatic system such as those of Algorithm 4.6 on page 83 and Algorithm 5.3 on page 102, we acted as if the only problem worth considering was that of assigning a set of codewords.
KeywordsCode Algorithm Arithmetic Code Adaptive Code Symbol Number Canonical Code
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