Code conversion apparatus

Details Code conversion apparatus Code conversion apparatus

1987-07-14

1989-05-23

Shoop, Jr., William M.

Coded data generation or conversion

Digital code to digital code converters

To or from run length limited codes

341 58, 341 95, A03M 746

Patent

active

048334707

ABSTRACT:
Each of data words has m bits. The m-bit data words are converted into corresponding n-bit code words. The n-bit code words are concatenated to form a bit sequence where the number of successive bits having a same binary value is limited to a range of a smaller value d to a larger value k. A code work W1 and also a following code word W2 are controlled to satisfy the limitation defined by the values d and k. The number of different code words forming an RLL code system is relatively large. For example, in respect of a first available RLL code word system, 8-bit data words are directly converted into 12-bit code words (Tw=0.667T) and the limitation defined by the values d and k equal to 2 and 10 respectively are satisfied. In respect of a second available RLL code word system, 6-bit data words are directly converted into 9-bit code words (Tw=0.667T) and the limitation defined by the values d and k equal to 2 and 23 respectively are satisfied.

REFERENCES:
patent: 3689899 (1972-09-01), Franaszek
patent: 3852687 (1974-12-01), Hodges
patent: 4486739 (1984-12-01), Franaszek
patent: 4598326 (1986-07-01), Leiner
patent: 4677421 (1987-06-01), Taniyama
patent: 4688016 (1987-08-01), Fok

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