Code modulating method and code modulating apparatus,...

Details Code modulating method and code modulating apparatus,... Code modulating method and code modulating apparatus,...

2005-03-01

2005-03-01

Williams, Howard L. (Department: 2819)

Coded data generation or conversion

Digital code to digital code converters

To or from run length limited codes

C341S068000, C360S041000

Reexamination Certificate

active

06861965

ABSTRACT:
In a code modulating method and a code modulating apparatus, a run length has an encoding rate of ⅔ 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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