Abstract
The design of a coding system is described and evaluated in
the context of a computer-to-terminal modem connection. Unlike other compression
problems, it is hard to characterise the kinds of information that may
require processing. For this reason the system uses an adaptive Markov
model, in conjuction with arithmetic coding. The compression performance
improves with available memory. Two techniques for storing the Markov
model are described. Experimental results are reported for a variety
of sample texts. It is shown that effective line speeds can be at least
doubled, and in some cases tripled, using less than 64 Kbytes of memory.
Notes
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