DATA COMPRESSION APPARATUS, DATA COMPRESSION PROGRAM, DATA COMPRESSION SYSTEM, DATA COMPRESSION METHOD, DATA EXPANSION APPARATUS, DATA COMPRESSION/EXPANSION SYSTEM, AND DATA STRUCTURE OF COMPRESSED DATA

摘要

PROBLEM TO BE SOLVED: To provide a data compression apparatus, a data compression program, a data compression system and a data compression method that improve the efficiency of data compression.SOLUTION: A data compression/expansion apparatus samples, for example, an audio signal at a predetermined period to acquire sampling data, and converts it to frequency domain data. The data compression/expansion apparatus divides the sequence of converted frequency domain data into a plurality of blocks each containing a variable number of pieces of data, and compresses each block.