Patent ID: 6861965
Filing Date: 2005-03-01
Classification: G11B

Abstract:
1. A code modulating method of converting a data bit train of 2n (where symbol n denotes an integer) bits into a channel bit train of 3n bits, said code modulating method comprising the steps of: converting the data bit train into the channel bit train so that a run length indicative of the number of “0” bits between adjacent ones of “1” bits in the channel bit train has a minimum value 1 and a maximum value 10; prohibiting, in the channel bit train, occurrence of a pattern “1010101010101” in which the run length 1 continuously repeated six times or more when any data bit train is modulated; and having, in the channel bit train, a DSV (Digital Sum Value) control bit which selectively takes either “0” bit or “1” bit in accordance with a DSV.