| 摘要 |
A signal modulation method used for a digital channel of digital recording media and digital communication. The method includes the steps of (a) receiving data in a first data unit of a first bit length and RLL encoding the received data into a (d,k) code word; and (b) receiving data in a second data unit of a second bit length and RLL encoding the received data if a number of consecutive zeroes is less than d when two codes words encoded in said step (a) are concatenated. Therefore, a higher resolution than that of other modulation codes is achieved, for a minimum time interval, 4T (diffraction limit). The DC component of a modulated code can be suppressed by controlling merging bits.
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