METHOD FOR DISCRIMINATING OF OPTICAL INFORMATION STORING MEDIA AND APPARATUS THEREOF

摘要

A method for discriminating an optical information storage medium and an apparatus thereof are provided to process RFDC(Radio Frequency Direct Current) signal generated when moving up and down an objective lens, using a BPF(Band Pass Filter), so as to discriminate the number of data layers accurately. A data layer discriminating part(250) comprises first and second slice processors(252,256), a BPF(Band Pass Filter,254), a detection logic part(258), and a data layer counter(259). When RFDC(Radio Frequency Direct Current) signal is inputted to the first slice processor, the first slice processor compares the RFDC signal with a first slice level. When BPF output signal is inputted in the second slice processor, the second slice processor compares the BPF output signal with a second slice level.