Dual CD/DVD player with automatic disc identification

Details Dual CD/DVD player with automatic disc identification Dual CD/DVD player with automatic disc identification

1997-11-13

1999-11-16

Huber, Paul W.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4429, 369 58, G11B 700, G11B 390

Patent

active

059869852

ABSTRACT:
An apparatus for playing back an optical recording medium automatically and quickly identifies the kind of optically recorded disc (CD or DVD) loaded in the apparatus. After a disc to be checked has been loaded in the apparatus, the disc is first driven in a DVD servo mode. If a peak value of a focus error signal detected in this mode is larger than a threshold value, the checked disc is recognized as a DVD. If the detected peak value of the focus error signal is smaller than the threshold value, the checked disc is thereafter driven in a CD servo mode. The checked disc is recognized as a CD if a peak value of a focus error signal detected in this mode is larger than a threshold value, which may be different from the above-mentioned threshold value.

REFERENCES:
patent: 5003521 (1991-03-01), Yoshida et al.
patent: 5235581 (1993-08-01), Miyagawa et al.
patent: 5448542 (1995-09-01), Ogino
patent: 5665957 (1997-09-01), Lee et al.
patent: 5831952 (1998-11-01), Yamada et al.
patent: 5917791 (1999-06-01), Tsuchiya et al.

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