10 January 2002 New RLL(1,k,4,6) modulations for optical recording
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Proceedings Volume 4342, Optical Data Storage 2001; (2002); doi: 10.1117/12.453371
Event: Optical Data Storage, 2001, Santa Fe, NM, United States
Abstract
RLL modulations that have d equals 1 constraint, such as RLL(1,7) 1) ,2), are widely used in the optical disk systems to enlarge a window margin. While 2 to 3 variable length modulations, which is representative coding rate for those modulations, were difficult to control digital sum variation (DSV), a common solution is inserting marginal bits2). However a drawback of this method is a loss on the recording capacity. This paper introduces new RLL(1,k,4,6) modulations which can generate various k constraint, k equals 7 or above, codes with a cording table. All of those have 4 to 6 fixed coding rates and can control the DSV without marginal bits. It can be emphasized that all the modulations use the same coding table and the same decoder. The table is constructed by 4 states sliding block encoder. Since code words by the (1,k,4,6) modulation is decoded only by a symbol look-ahead decoder, error propagation is within 8 data bits. The high coding rate and sufficient DSV control ability can bring an extra capacity or system margin.
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Atsushi A.H. Hayami, Toshio Kuroiwa, Ken Miyazaki, "New RLL(1,k,4,6) modulations for optical recording", Proc. SPIE 4342, Optical Data Storage 2001, (10 January 2002); doi: 10.1117/12.453371; https://doi.org/10.1117/12.453371
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KEYWORDS
Modulation

Dynamic signature verification

Computer programming

Optical recording

Multiplexing

Optical discs

Sensors

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