Data modulating method and apparatus and data demodulating method and apparatus
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United States of America Patent
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Oct 11, 1994
Grant Date -
N/A
app pub date -
Feb 9, 1993
filing date -
Feb 14, 1992
priority date (Note) -
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Abstract
A modulating method and apparatus and a demodulating method and apparatus wherein high density recording can be achieved and a dc component can be controlled with a variable length channel code are disclosed. Recording data are divided into a predetermined plurality of blocks, and those of the recording data at a portion other than a boundary portion of each of the blocks are coded referring to a table of a first ROM so that data of m bits may be converted into a code of n bits. The remaining data at the boundary portion of each block are converted into a code referring to another table of second ROM so that data of m bits may be converted into a code of n bits. Further, a code of n bits for minimizing a dc component is produced referring to a third table of a further ROM and is added to the code generated by the first and second ROMs.
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