Patent ID: 6654325
Filing Date: 2003-11-25
Classification: G11B

Abstract:
A write parameter calibration method, comprising:a process of recording data patterns on an information medium while controlling a recording condition according to the recording data patterns; a process of reading the data patterns recorded on said information medium to acquire a reproduced signal; a process of generating a clock signal from said reproduced signal; a process of comparing a phase difference between said reproduced signal and said clock signal with a given value and generating pulses according to a result of the comparison; a process of classifying data patterns of said reproduced signal into respective pattern groups; a process of classifying said pulses into said classified pattern groups; a process of counting said classified pulses; and a process of determining a recording condition according to said recording data pattern on the basis of a result of said counting a process of detecting a phase difference between the reproduced signal and a reference signal and a clock signal generated from the reproduced signal; a process of discriminating the phase difference for classification according to said data pattern; and a process of determining the recording condition according to said discriminated phase difference.