H - Electricity – 04 – L
Patent
H - Electricity
04
L
354/67
H04L 25/10 (2006.01) G11B 20/14 (2006.01) H03M 7/00 (2006.01) H04L 25/49 (2006.01)
Patent
CA 1211570
27 ABSTRACT: The invention relates to the serial transmission of binary data via an information channel and relates in particular to a method of coding and decoding predetermined binary block codes. The invention particularly relates to cases in which the information channel is in the form of an optical disc. In a block coding method, blocks of, for example, m data bits are converted to blocks of n channel bits (n > m). The blocks of information bits thus obtained must satisfy, for example, the requirement of being (d, k)- constrained. In (d, k)-constrained sequences the run length of "zeroes" is limited form a minimum d to a maxi- mum k of zeroes between each pair of consecutive "ones". This coding has the disadvantage that it has a low-fre- quency spectrum which is too great to be ignored. Accord- ing to the invention, a block of separation bits is included between each of the blocks of n-information bits. In those cases where the format is not prescribed by the (d, k)- constraint the separation bits are chosen such that the low-frequency spectrum and particularly the direct current unbalance is as low as possible.
381362
Immink Kornelis A.
Nijboer Jakob G.
Odaka Kentaro
Ogawa Hiroshi
Koninklijke Philips Electronics N.v.
Van Steinburg C.e.
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