Modulating method

Details Modulating method Modulating method

1993-05-19

1995-07-11

Ramirez, Ellis B.

Excavating

341 51, 341 59, 341 67, 371 28, H03M 746, H03M 1300

Patent

active

054327997

ABSTRACT:
A method of modulating digital data to a variable-length code having parameters d, k, m, n, and 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 includes 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.

REFERENCES:
patent: 5099237 (1992-03-01), Fitingof
patent: 5271016 (1993-12-01), Hilden et al.

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