Disk discriminating method and apparatus

Details Disk discriminating method and apparatus Disk discriminating method and apparatus

1996-03-22

1998-04-28

Tran, Thang V.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 50, G11B 1912

Patent

active

057454604

ABSTRACT:
A disk discriminating method and disk discriminating apparatus accurately discriminate plural types of disks with different recording densities. While a disk is rotated by a constant number of rotations, a recorded signal is read from the disk to acquire a read signal, one of the maximum period, minimum period, maximum inversion interval, minimum inversion interval and average frequency of the read signal is detected, and the type of the disk is determined in accordance with the detected value. This structure needs only a simple circuit, and no special mechanism, to be added to a disk player.

REFERENCES:
patent: 5003521 (1991-03-01), Yoshida et al.
patent: 5202874 (1993-04-01), Zucker et al.
patent: 5289451 (1994-02-01), Ahsinuma et al.
Japan 362134862 A "Magnetic Disk Device" Jun. 17, 1987 (Abstract Only).
Japan 361170929A "Optical Information Reproducing Device" (Abstract Only), Aug. 1986.
Japan 404067463A "Rotating Driving Device for Disk" (Abstract Only), Mar. 1992.

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