| 摘要 |
<p>A method of generating run length limited (RLL) code having improved DC suppression capability and modulation and demodulation methods of the generated RLL code are provided. According to the method, code words that satisfy (d, k) run length constraint are generated. By allocating main code groups, in which a code word can be duplicated depending on the characteristics of the generated codeword and code words of each main code group are allocated in considering of a code word sum value (CSV) parameter, which represents the direct current (DC) value in a code word, and the inverse characteristics of an INV parameter, which predicts the transition direction of digital sum value (DSV) of the next code word, and allocating decision groups for differentiating the duplicated code words, by using some of the code words, which are already used in main code group, as code words for DSV groups for DC suppression, the number of code word bits can be reduced and the recording density increases, while improving DC suppression capability.</p> |
