发明名称 |
Code modulating method and code modulating apparatus, demodulating method and demodulating apparatus, and information recording medium |
摘要 |
In a code modulating method and a code modulating apparatus, a run length has an encoding rate of 2/3 which is equal to that of (1, 7) modulation, and indicates the number of "0" bits between adjacent ones of "1" bits in the channel bit train. A data bit train is converted into the channel bit train so that the run length has a minimum value 1 and a maximum value 10. Further, upon converting any data bit train, the channel bit train does not include a pattern "1010101010101" in which the run length 1 is continuously repeated six times or more. The channel bit train has a DSV (Digital Sum Value) control bit which selects the "0" bit or "1" bit in accordance with a DSV. The channel bit train obtained by using random data for the data bit train is NRZI converted into a signal. A frequency component of the signal is reduced from a maximum value of the frequency component by 20 dB or less as a power density at a frequency of {fraction (1/10,000 or less of a channel clock frequency.
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申请公布号 |
US2004207545(A1) |
申请公布日期 |
2004.10.21 |
申请号 |
US20030736785 |
申请日期 |
2003.12.17 |
申请人 |
NEC CORPORATION;KABUSHIKI KAISHA TOSHIBA |
发明人 |
KAYANUMA KINJI;IWANAGA TOSHIAKI;NODA CHOSAKU |
分类号 |
G11B20/14;G11B27/30;H03M7/14;(IPC1-7):H03M5/00 |
主分类号 |
G11B20/14 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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