Method of modulating and/or demodulating RLL code having enhanced direct current suppression capability
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United States of America Patent
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Aug 27, 2002
Grant Date -
May 23, 2002
app pub date -
Sep 6, 2001
filing date -
Sep 6, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of modulating and a method of demodulating for a run length limited (RLL) code having an improved direct current (DC) suppression capability. Received data is modulated using a DC suppression control code group which is separate from a data modulation conversion code group. The DC suppression control code group maximizes use of the characteristics of codewords in conversion code groups, such as, the sign of parameter CSV representing the DC value within a codeword and the characteristics of parameter INV predicting the DSV transition direction of the next codeword, while relaxing the redundant codeword generation condition or the condition of usable codewords compared with the data modulation conversion code group. Therefore, the number of codewords increases, so that the probability of DC suppression control further increases.
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