| 摘要 |
PROBLEM TO BE SOLVED: To provide a code modulating method and a code modulating apparatus for obtaining a modulating code which has an encoding rate equal to that of (1, 7) modulation and preventing or prohibiting the existence of a pattern which is liable to bring about a detecting error of a reproduction signal in a channel bit train and is suitable for high-density recording with DC components reduced; and to provide a demodulating method and a demodulating apparatus for reproducing this, and an information recording medium which records data by using the code and prevents or prohibits the occurrence of the detection error. SOLUTION: 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. COPYRIGHT: (C)2007,JPO&INPIT
|
