Thomas|Kayden
Method for identifying optical disk type
The invention provides a method for identifying a disk type of an optical disk in an optical disk drive. First, a pickup head of the optical disk drive is moved towards the optical disk. A reflected signal is then observed as said pickup head of the optical drive is moving on the optical disk. A motion behavior is then detected from said reflected signal. A first period between motion initiation of the pickup head and a first peak occurrence of the power of the reflected signal is then determined, the first peak occurrence take places while the pickup head detects said motion behavior of said reflected signal is in accordance with a motion reflected by an polycarbonate layer of the optical disk. A second period between the first peak occurrence and a second peak occurrence of the power of the reflected signal is then determined, the second peak occurrence takes place while the pickup head detects said motion behavior of said reflected signal is in accordance with a motion reflected by an reflection layer of the optical disk. An identification threshold value is then determined according to the first period. The second period is then compared with the identification threshold value to obtain a comparison result. Finally, the disk type of the optical disk is identified according to the comparison result.
Mediatek Inc.
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Cheng-Hsien Ya-Hsin
Chang Ching