| 摘要 |
<P>PROBLEM TO BE SOLVED: To stably precod a signal of a high bit rate in a coding circuit in an optical communication system. <P>SOLUTION: A coding circuit 3 has a D latch circuit 8 which outputs a 3rd signal S13 which delays a period of S6 by a half-bit, an AND circuit 10 which carries out an AND operation of S5 and a first clock signal S8 and outputs a 4th signal S15, an AND circuit 11 which carries out the AND operation of the reversed signals of S13 and S8 and outputs a 5th signal S16, T flip-flops 12 and 13 which input S15 and output a 6th signal S17 and input the S16 and output a 7th signal S18, and an XOR circuit 22 which carries out EXCLUSIVE OR operation of S17 and S18, to be outputted as the 8th signal, among a first signal S5 and a second signal S6 which has data obtained by dividing a data for coding in parallel and alternately, respectively. <P>COPYRIGHT: (C)2007,JPO&INPIT |
