Data modulating method and apparatus and data demodulating metho

Details Data modulating method and apparatus and data demodulating metho Data modulating method and apparatus and data demodulating metho

1993-02-09

1994-10-11

Young, Brian K.

Coded data generation or conversion

Digital code to digital code converters

To or from minimum d.c. level codes

341 50, H03M 518

Patent

active

053551338

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.

REFERENCES:
patent: 5122875 (1992-06-01), Raychaudhuri

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