Optische Platte, Wiedergabegerät und Aufzeichnungsgerät

摘要

The present invention provides an optical disc in which main information was recorded by arranging a plurality of marks or pits in accordance with a modulation signal such that said marks or pits are arranged at predetermined positions at an interval which is n times a predetermined period T wherein n is a positive integer, said predetermined positions being shifted in a circumferential direction in accordance with sub information when said marks and pits are formed.