Coded data generation or conversion – Digital code to digital code converters – To or from run length limited codes
Patent
1995-10-10
1997-02-18
Gaffin, Jeffrey A.
Coded data generation or conversion
Digital code to digital code converters
To or from run length limited codes
341 58, 341 50, 341 51, H03M 742
Patent
active
056044976
ABSTRACT:
The present invention is an apparatus and method for increasing the density of run-length-limited (RLL) block codes without increasing error propagation. By inserting a number of uncoded bytes (M) between each coded byte, the coding density is thereby increased. Starting with an RLL code with a block length (I) which is, for example, a multiple of 8, a number (M) of uncoded bytes may be inserted between each coded byte. The resulting density is: (I+8M)/(J+8M), wherein the resulting k constraint, of the (d,k,l) constraints is increased by 8M, and the resulting l constraint is increased by 4M. For example, starting with an RLL code having a coding density of 8/9 (I=8, J=9) and constraint set of (0,4,4), inserting one uncoded byte between each coded byte (M=1) results in a coding density of 16/17 which is 5.88% greater than the original 8/9 coding density. The constraint set is also increased to (0,12,8), where k is increased by 8 and l is increased by 4. The coding density is significantly increased without increasing the error propagation, since the size of the coded block is not increased.
REFERENCES:
patent: 4707681 (1987-11-01), Eggenberger et al.
patent: 5099237 (1992-03-01), Fitingof
patent: 5150379 (1992-09-01), Baugh et al.
Gaffin Jeffrey A.
Lucent Technologies - Inc.
Vick Jason H.
LandOfFree
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