Patent ID: 6816443
Filing Date: 2004-11-09
Classification: G11B

Abstract:
An optical disc discrimination apparatus for use in an optical disc reproducer which reproduces data from a plurality of different types of discs with a single optical pickup, the optical disc discrimination apparatus comprising:an RF envelope generator generating an envelope signal from an RF signal read from one of the discs which is loaded in the optical disc reproducer; and a controller detecting an amplitude of the envelope signal at an off-track state of the loaded disc, and discriminates the type of the loaded disc using the detected amplitude, wherein said controller comprises: an envelope amplitude detector detecting the amplitude of the envelope signal and sampling the envelope signal between a maximum value and a minimum value into n sample signals at a zero cross interval, and obtaining an average value of the obtained n peak-to-peak values as the detected amplitude, and a disc discriminator comparing a level of the detected amplitude with at least one predetermined reference level and discriminating whether the loaded disc is a CD, a DVD-ROM, or a DVD-RAM, based on the comparison.