| 摘要 |
PURPOSE:To maintain the error correcting capacity of a Hamming code and, at the same time, to make error correction possible, by constituting an error correcting code which is controlled so as to produce the mark rate balancing property in the block of an error inspecting bit and mark balance adding bit. CONSTITUTION:After an information sequence is distributed to four sequences by means of a serial-parallel conversion section 1, error inspecting bits c1-c4 are implemented to each sequence by operation. Eight-sequence signals are combined at a parallel/serial conversion section 2 and converted into optical signals by an electrooptic converter 3, and then, the optical signals are sent to an optical fiber cable. Received optical signals are converted into electric signals by a photoelectric converter 4. The electric signals are first distributed to 8-sequence signals by a serial/ parallel conversion section 5 and block synchronism is secured to the sequences. Collation of an inspection pattern with a received inspection pattern is performed by an inspection pattern collating section 7 and a syndrome is found by means of a syndrome generating section 8. Wrong bits in the information sequence are corrected at an error correcting section 9 and the original information sequence is restored by a parallel/serial conversion section 10.
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