| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical recording medium, in which additional information other than primary information, such as voice information or image information and the like, is recorded without assigning special areas in the optical recording medium. <P>SOLUTION: On a platter-shaped optical recording medium D, primary information is recorded along a track TR, additional information Ainf is recorded by the modulation of TRP, which is an interval of the track TR. <P>COPYRIGHT: (C)2003,JPO |
