CODE SELECTION METHOD, DECODING METHOD, ENCODING DEVICE, DECODING DEVICE, PROGRAM, AND RECORDING MEDIUM

摘要

PROBLEM TO BE SOLVED: To reduce a processing amount for selecting a code table for encoding time-series data from a plurality of types of code tables.

SOLUTION: Frequencies h (x) of data values x of time-series data in predetermined discrete time zones are determined; by using a plurality of types of code tables T (j) in each of which at least the respective data values x and respective codes c (x, j) respectively corresponding to the respective data values x are related to each other, and the respective determined frequencies h (x), the sums of products SP (j)=Σxh (x)×b (x, j) of the frequencies h (x) of at least part of the data values x and the number of bits b (x, j) of codes c (x, j) corresponding to the data values x are respectively calculated for the respective code tables T (j); and the code table for encoding the time-series data in the discrete time zones is selected from the plurality of types of code tables T (j) by using the calculated sums of products SP (j).

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