| 摘要 |
PROBLEM TO BE SOLVED: To improve bit error rate and to secure a skew margin by correcting channel bit data, when there are data not satisfying conditions, with respect to a minimum consecutive length and a maximum consecutive length of the same symbol in the channel bit data obtained thruough binarizing the signals read from a recording medium. SOLUTION: The level of an RF signal 7a is tentatively stored in an RF signal level storage section 20 at the time of the binary level determination of channel bits. A (d'-2) detection section 26 and a (k'+2) detection section 27 detect data that do not satisfy the conditions, with respect to a minimum consecutive length and a maximum consecutive length of the same symbol in channel bit data strings. The data decoder comprises correction bit location detecting sections 18, 19 which output a correction bit location designating signal, based the level of the RF signal at the time of the binary level determination that is stored in the RF signal level storage section 20 and a bit data inversion correction section 15 which inverts a logic level of a bit location designated, based on the correction bit location designating signals. COPYRIGHT: (C)2006,JPO&NCIPI
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