H - Electricity – 03 – M
Patent
H - Electricity
03
M
H03M 13/21 (2006.01) G11B 20/14 (2006.01)
Patent
CA 2680404
Problem: how to record and play back data at a high line density. Means for solving the problem: a DSV control bit determining/inserting unit (11) inserts DSV control bits for execution of DSV control into an input data string and outputs the data string including the DSV control bits to a modulation unit (12). The modulation unit (12) converts the data string with a basic data length of 2 bits into variable length code with a basic code length of 3 bits in accordance with a conversion table and outputs the code resulting from the conversion to a NRZI encoding unit (13). The conversion table used by the modulation unit (12) includes substitution codes for limiting the number of consecutive appearances of a minimum run to a predetermined value and substitution codes for keeping a run length limit. In addition, the conversion table enforces a conversion rule, according to which the remainder of division of the '1' count of an element in a data string by 2 having a value of 0 or 1 shall always be equal to the remainder of division of the '1' count of an element in the code resulting from conversion of the data string by 2.
Kahlman Joseph A. H. M.
Nakagawa Toshiyuki
Nakamura Kosuke
Narahara Tatsuya
Schouhamer Immink Kornelis A.
Fetherstonhaugh & Co.
Koninklijke Philips Electronics N.v.
Sony Corporation
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