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Abstract

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 1/10,000 or less of a channel clock frequency.

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