| 摘要 |
<p>PURPOSE:To form a transmission data whose low frequency band is effectively suppressed by providing a 1st low frequency suppression means suppressing a low frequency band of main information, a 2nd low frequency suppression means suppressing a low frequency band of sub information, and an output means synthesizing and outputting outputs of the 1st and 2nd low frequency suppression means. CONSTITUTION:A mapping coding circuit 12 applies mapping coding to a main information data inputted from an input terminal 10 to suppress its low frequency component. An error correction coding circuit 14 divides an output of the mapping coding circuit 12 with a generation polynomial and outputs the residue as a check bit, that is, a sub information data. Then a 8-9 conversion circuit 16 the bit of the sub information data from 8-bit into 9-bit. An addition circuit 18 adds the check bit from the 8-9 conversion circuit 16 to the main information data from the mapping coding circuit 12 to output a code word in P-bit as a whole. Thus, the transmission data whose low frequency component is sufficiently suppressed is formed and data transmission with high density is attained.</p> |
