Disk discrimination apparatus for an optical disk reproducing ap

Details Disk discrimination apparatus for an optical disk reproducing ap Disk discrimination apparatus for an optical disk reproducing ap

1997-05-27

1999-06-01

Tran, Thang V.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 54, 369 4428, G11B 700

Patent

active

059094192

ABSTRACT:
A disk discrimination apparatus for use in an optical disk reproducing apparatus detects a tracking error signal, discriminates between disks, and prevents reproduction of a disk which does not correspond to the reproducing apparatus. In the disk discrimination apparatus, when a second type disk, having a track pitch which is smaller than that of a first type disk, is played by the optical disk reproducing apparatus, a discriminator detects that the disk is not a first type disk based on an output signal of a tracking error signal generating circuit. The discriminator performs a discrimination operation by comparing the signal level of a tracking error signal with a predetermined reference value. In another embodiment, the discriminator includes a counter for counting the number of zero-crossings of the tracking error signal, and performs the disk discrimination using a count value produced by the counter.

REFERENCES:
patent: 4773052 (1988-09-01), Sugiura et al.
patent: 4890273 (1989-12-01), Takeuchi et al.
patent: 5130967 (1992-07-01), Tanaka et al.
patent: 5381392 (1995-01-01), Hira
patent: 5721718 (1998-02-01), Hwang

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