Patent ID: 7738336

Claim:
An apparatus for optical information recording and reproducing comprising: a light source and control circuitry configured to record one or more specific codes in a medium for optical information recording and reproducing; a photodetector and detection circuitry configured to reproduce the codes from the medium; a processing circuitry configured to measure, from a reproduced signal of the codes, multiple peak values of amplitude of the reproduced signal, each of the peak values being defined as an amplitude value at which the amplitude of the reproduced signal reaches a maximum or convex point, or each of the peak values being defined as an amplitude value at which the amplitude of the reproduced signal reaches a minimum or concave point, wherein multiple maximum or convex points or multiple minimum or concave points of the amplitude of the reproduced signal are measured; a statistic calculation circuit configured to calculate a statistic by using the multiple peak values at the same or different recording places; and a condition decision circuit configured to decide at least one of a recording laser power condition and a recording pulse condition by using the statistic.