Automatic disk discriminating method and apparatus in optical di

Details Automatic disk discriminating method and apparatus in optical di Automatic disk discriminating method and apparatus in optical di

1997-01-08

1999-09-28

Neyzari, Ali

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 54, G11B 2736

Patent

active

059599553

ABSTRACT:
An automatic disk discriminating method and apparatus in an optical disk system. A specific period value (that is, a specific frequency) of the information signal reproduced from a disk is compared with a predetermined reference value. If a higher frequency than the predetermined reference value is detected, the disk is determined to be a DVD. If a lower frequency than the predetermined reference value is detected, the disk is determined to be a CD. The disk discriminating method and apparatus are less affected by noise, thereby improving the accuracy in determining the disk type.

REFERENCES:
patent: 5003521 (1991-03-01), Yoshida et al.
patent: 5042020 (1991-08-01), Endo
patent: 5237549 (1993-08-01), Shimazawa
patent: 5289451 (1994-02-01), Ashinuma et al.
patent: 5684771 (1997-11-01), Furakawa
patent: 5745460 (1998-04-01), Tateishi

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