G - Physics – 11 – B
Patent
G - Physics
11
B
352/32.1
G11B 20/14 (2006.01) G06T 9/00 (2006.01) H03M 5/14 (2006.01)
Patent
CA 1291561
ASYMMETRIC RLL CODING ABSTRACT OF THE DISCLOSURE Method and apparatus 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-encoding 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 adjusting the values of d and k, so as to alternate between a value d1 and d2 and a value k1 and 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 d,k coding constraint and means for adjusting d and k as used by said means for generating output data bits to alternate between a value d1 and d2 and a value k1 and k2 respectively, where d1 ? d2. Fractional numerical values for d1 and d2 can be employed in the method or apparatus.
535983
International Business Machines Corporation
Saunders Raymond H.
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