| 摘要 |
PURPOSE:To attain the decoding with simple processing without using a complicated processing circuit by deciding it as a decode word that a difference of each time rate of a high level and a low level with respect to a regenerative one-bit is used as a reliability index and the total sum of the indexes is minimized thereby using no complicated processing circuit. CONSTITUTION:The difference of each time rate of a high level and a low level of an output of a voltage comparator 12 with respect to a regenerative bit is used as the reliability index of decoding in the unit of bits and a code word minimizing the total sum of the reliability indexes in a different bit of each code word from a received word is decided to be a decode word. For example, the output of the voltage comparator for a received waveform corresponding to each bit is divided into some points on a time axis, +1 is related to each divided output with a mark (high level) and -1 is related in case of a space (low level) and the value being the sum is used as information representing the reliability of decoding in the unit of bits. Thus, the error correction capability of an error correction code is kept and the decoding is applied with a simple processing without requiring complicated processing.
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