| 摘要 |
PURPOSE: A method of recording multi-level data in an optical disc device is provided to prevent generation of error in reproduction of multi-level data, caused by instantaneous change in a laser power level or local ununiformity of an optical disc. CONSTITUTION: Data is recorded in a multi-level recording mode based on a predetermined multi-level recording reference signal. While data is being recorded, an element for varying the predetermined multi-level recording reference signal is searched. The predetermined multi-level recording reference signal is changed in response to the searched element. The varied multi-level recording reference signal is recorded on a recording medium. Information for recognizing the varied multi-level recording reference signal is added to the front or back of the varied multi-level recording reference signal. |
