Method of generating run length limited (RLL) code having improved DC suppression capability and modulation/demodulation method of the generated RLL code
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United States of America Patent
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Jul 31, 2001
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app pub date -
Mar 9, 2000
filing date -
Mar 9, 1999
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Abstract
A method of generating a run length limited (RLL) code having improved direct current (DC) suppression capability and modulation and demodulation methods of the generated RLL code. According to the method of generating the RLL codes, code words that satisfy a (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 consideration of a code word sum value (CSV) parameter, which represents the DC value in a code word, and an inverse characteristic 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 the DC suppression, the number of code word bits can be reduced and the recording density increases, while improving the DC suppression capability.
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