Apparatus and method of determining a power parameter for writing/erasing information on an optical medium

摘要

The invention relates to an apparatus and method of determining a value of a write/erase power parameter (Ptarget) for writing/erasing information on an optical recording medium by means of a radiation beam. The method is based on the curve-fitting of a function by a set of parameters a-b-c, said function establishing a relation between a product of the power level (P) of the radiation beam with a modulation factor (M) of the recorded signals, and the power level (P). The set of parameters are thus used for solving an equation establishing a relation between a gamma curve and the power level (P), the solution of said equation being considered as the optimum value of the write/erase power parameter (Ptarget). An optimum power level (Popt) can thus be derived from the write/erase power parameter (Ptarget). Use: writing/erasing of an optical recording medium.