Modulating method

Details Modulating method Modulating method

H - Electricity

03

K

H03K 7/00 (2006.01) G11B 20/14 (2006.01) H03M 13/00 (2006.01)

Patent

CA 2096792

ABSTRACT OF THE DISCLOSURE A method of modulating digital data to a variable-length code (d, k; m, n; r) for recording information on and reproducing the same from an optical disc. The optimal range of a minimum run length d corresponding to the minimum number of successive same symbols is determined by a procedure which comprises a first step to determine the minimum S/N required for obtaining a desired error rate from the relationship between a bit error rate and the S/N when d = 0; a second step to obtain the relationship between a change of the numerical value d and that of the S/N by calculating, on the basis of the required minimum S/N obtained at the first step, the S/N loss caused due to the change of the numerical value d; and a third step to determine, from the relationship between the numerical value d and the S/N, the range of the value d corresponding to the S/N of the transmission characteristic dependent on an optical system and an optical disc.

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