| 摘要 |
PROBLEM TO BE SOLVED: To improve processing efficiency without the need of a data operation in a bit unit by executing a conversion processing on data with a first length and data with a second length to which non-used data is added, based on a conversion table. SOLUTION: When compiling (compressing) data where six subsequent bits are effective in one byte, three types of compilation tables are available. 3-8 bits in eight left bits and 3-4 bits in eight right bits, that is, eight bits in total, on a first byte and a second byte (objective areaα1 ) from its head are extracted by using a compilation table A111, and they are stored in an output area 1. In the compilation table A111, integer values constituted of effective bits are stored in respective array elements being one-dimensional arrays, which correspond to the integer values of two bytes and have the sizes of 2<16> . When a value stored in the address of the integer value represented by the objective areaα1 is taken in, it is equivalent to the extraction of the effective bit. |
