| 摘要 |
PROBLEM TO BE SOLVED: To improve the security of communication in closed area communication, to raise the compressibility of binary data and to shorten communication time. SOLUTION: This equipment is provided with plural Huffman tables 15 and Hi, a Huffman table selection means for selecting an optional Huffman table among the plural Huffman tables 15 and Hi and a coding/decoding means for referring to the selected Huffman table 15 and Hi, compressing the binary data and restoring code data. In this case, when the Huffman table 15 and Hi is selected, the Huffman table 15 and Hi is referred to and the binary data are encoded in a transmitter, unless the selected Huffman table is provided in a receiver, a third person can not enter the closed area communication. Thus, the security of the communication in the closed area communication is improved and reliability is improved.
|
