| 摘要 |
A method and apparatus for optical disc discrimination, which can discriminate immediately and correctly the types of a plurality of optical discs having different record densities of recorded information from each other. An optical disc discrimination method for discriminating between at least two types of optical discs having record densities of recorded information different from each other; an optical disc to be discriminated is driven to rotate, a read-out light beam is irradiated on the optical disc to be discriminated by performing at least a focus servo operation as a servo operation, an RF signal is obtained by receiving a reflected light beam from the optical disc to be discriminated, the RF signal is converted into binary digits as a pulse train signal, the number of pulses in the pulse train signal is counted for a predetermined time, a count value during the predetermined time is compared with a threshold value, and the optical disc to be discriminated is determined to be one having the least amount of recording density of the at least two types of optical discs when the count value within the predetermined time is equal to or less than the threshold value.
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