Method and apparatus for asymmetrical RLL coding
March 30, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3394352 3685033 3689899 3840854 Apparatus and method for generating a data code with a spectral null Sequential encoding and decoding of variable word length, fixed rate data codes Data encoding method and system employing two-thirds code rate with full word look-ahead Videodisc player with constant turntable velocity Method and apparatus for generating a noiseless sliding block code for a (1,7) channel with rate 2/3 Run length limited data encoder InventorsApplicationNo. 175171 filed on 03/30/1988US Classes:360/40, In specific code or form341/59To or from run length limited codesExaminersPrimary: Canney, Vincent P.Attorney, Agent or FirmForeign Patent References
International ClassesG11B 005/09H03K 013/24 AbstractThis disclosure concerns for generating asymmetrically constrained run-length-limited encoded data from a serialized binary string of 1's and 0's. The method comprises the steps of encoding the input data bits using a run-length-limited constraint in the form of M/N (d,k), where M is the number of input data bits, N is the number of output bits associated therewith, d is the minimum number of 0 data bits between adjacent data bit 1's, and k is the maximum number of 0 data bits between adjacent 1's; and alternating the values of d and k between a set (d1, k1) and a set (d2, k2), respectively, where d1 ≠d2. The apparatus comprises means for generating N output data bits in response to M input data bits and for generating data bit 0's between data bit 1's based upon a run-length-limited coding constraints (d1, k1) and (d2, k2), where constraints (d1, k1) and (d2, k2) apply alternately to runs of zeroes between output data ones. Fractional numerical values of d1 and d2 can be employed in the method or apparatus.Other References
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