Data conversion method and recording and reproduction apparatus

Details Data conversion method and recording and reproduction apparatus Data conversion method and recording and reproduction apparatus

1994-07-05

1996-04-16

Young, Brian K.

Coded data generation or conversion

Digital code to digital code converters

To or from minimum d.c. level codes

H03M 500

Patent

active

055087019

ABSTRACT:
Codewords with CDS=0 are mapped in corresponding relationship to datawords, and codewords with CDS>0 and codewords with CDS<0 are paired together and mapped in corresponding relationship to the remaining datawords, and further, codewords with CDS.noteq.0, left unmapped, are mapped in corresponding relationship to the datawords to which the codewords with CDS=0 have been mapped, thus reducing the probability of occurrence of codewords with large DSV in absolute value terms and thereby achieving a further suppression of low-frequency components. Based on the least significant bit of the codeword corresponding to the last dataword and on the current and next datawords, a codeword corresponding to the current dataword is selected, thus realizing high-density recording with good overwrite characteristics.

REFERENCES:
patent: 4499454 (1985-02-01), Shimada

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