Journal ArticleDOI
An optimization of modulation codes in digital recording
T. Horiguchi,K. Morita +1 more
TLDR
A few new modulation codes in digital magnetic recording is presented and one of the new codes shows the highest linear density limit among the existing codes and is improved over, for example, MFM and 4/5-rate-NRZI codes by about 20% to 30% in the density limit for the channel.Abstract:
A few new modulation codes(or run-length-limited codes) in digital magnetic recording is presented. Linear density limits of the new codes and the existing codes are evaluated for a typical recording channel. One of the new codes shows the highest linear density limit among the existing codes and is improved over, for example, MFM and 4/5-rate-NRZI codes by about 20% to 30% in the density limit for the channel. A method for constructing the new codes is presented.read more
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References
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Journal ArticleDOI
Sequence-state methods for run-length-limited coding
TL;DR: Methods are presented for the encoding of information into binary sequences in which the number of ZEROS occurring between each pair of successive ONES has both an upper and a lower bound.
Journal ArticleDOI
A Survey of Coding Schemes for Transmission or Recording of Digital Data
TL;DR: In this survey, coding techniques and results which pertain to such problems as reduction of dc wandering, suppression of intersymbol interference, and inclusion of selfclocking capability are reviewed.
Journal ArticleDOI
Adaptive Coding for Self-Clocking Recording
TL;DR: This paper describes a coding method which improves code efficiency while maintaining the constraint on the length of zero strings and shows that adaptive coding, which is an extension of the block code concept known from information theory, offers a significant improvement.
Journal ArticleDOI
A coding method in digital magnetic recording
TL;DR: The last coding method is called "modified nonreturn to zero inverted" (MNRZI), and the recording density limit was obtained for each method from measurement of the peak shift and signal to noise ratio for a given recording channel.