TW200518061A - Code modulating method and code modulating apparatus, demodulating method and demodulating apparatus, and information recording medium
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Code modulating method and code modulating apparatus, demodulating method and demodulating apparatus, and information recording medium
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Priority claimed from JP2003399434Aexternal-prioritypatent/JP3957679B2/en
Application filed by Nec Corp, Toshiba CorpfiledCriticalNec Corp
Publication of TW200518061ApublicationCriticalpatent/TW200518061A/en
Signal Processing For Digital Recording And Reproducing
(AREA)
Dc Digital Transmission
(AREA)
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.
TW092137294A2003-11-282003-12-29Code modulating method and code modulating apparatus, demodulating method and demodulating apparatus, and information recording medium
TW200518061A
(en)
Method of converting a number of m-bit information words into modulated signal, method of making a record carrier medium, encoding device, decoding device, recording device, reading out device, signal as well as record carrier medium
Method and apparatus for coding information, method and apparatus for decoding coded information, method of fabricating a recording medium, the recording medium and modulated signal