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Low freq. power spectra, varying m, d = 1, k = 3, log scale

Low freq. power spectra, varying m, d = 1, k = 3, log scale

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Conference Paper
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An RDS-minimizing, multi-mode modulation coding scheme, using maximum run-length violating markers and based on the Knuth balancing approach, is applied to run-length limited sequences. Simulations are used to measure spectra and DC suppression performance. A comparison to EFM is included.

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Citations

... Of course, the marker should be carefully chosen, such that it does not violate the lower runlength constraint and enables unique retrieval of the balancing index. In [3], the principle of a runlength violating marker was applied to keep the running digital sum of a sequence small rather than balancing it. This is an alternative to techniques for improving spectral performance as proposed in [2]. ...
Conference Paper
Full-text available
A well-known method for balancing binary sequences, in the sense of forcing them to have as many zeroes as ones, was proposed by Knuth. It is based on the inversion of all bits beyond a certain balancing index, and communicating this index via a prefix. This principle has also been applied to balance runlength-limited (RLL) sequences. Another Knuth-based approach exploits the insertion of a marker in the RLL sequence causing a deliberate runlength violation at the position of the balancing index. This marker method has an advantage over the prefix method, since its redundancy does not grow with the length of the source blocks. In this paper, the markers are optimized with respect to their length and the severeness of the runlength violation, for possible application in future (optical) recording systems.