Optical disc apparatus and optical disc recording and reproduction method

Abstract

To form recording waveforms optimal to all optical discs including unknown discs and inferior quality discs. In an optical disc apparatus according to the present invention, a CPU changes a previously set pulse width at a predetermined code length by a predetermined value and controls an optical pickup, an RF amplifier, an evaluation index measurement circuit, and the like. With use of the changed pulse width, an asymmetry of a reproduction signal at the time of recording and reproducing test data on the optical disc is measured. On the basis of the measured asymmetry of the reproduction signal, a correction value for correcting the previously set pulse width at the predetermined code length is calculated. On the basis of the calculated correction value, the pulse width at the predetermined code length is corrected.

Dependencies are inferred from the claim text.