Automatic detecting device for land pre-pits signals

Details Automatic detecting device for land pre-pits signals Automatic detecting device for land pre-pits signals

2007-09-04

2007-09-04

Korzuch, William (Department: 2627)

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

C369S059170

Reexamination Certificate

active

10743429

ABSTRACT:
An automatic detecting device of land pre-pits signal is disclosed. The device adjusts gain of push-pull signals to raise the signal to noise ratio of the land pre-pits signal to the wobble signal. Digital logic computation is also utilized to recognize the practical position of the land pre-pits. The level automatic detection of the RC circuit and the fixed slice level compose an automatic slice level, which is the basis for detecting the land pre-pits. The disclosed device eliminates the drawback of not easy to obtain correct land pre-pits signal from written disks by the conventional of fixed land pre-pits slice level technology.

REFERENCES:
patent: 6487149 (2002-11-01), Yokoi et al.
patent: 6744721 (2004-06-01), Kamioka et al.
patent: 6912190 (2005-06-01), Inokuchi et al.
patent: 7079475 (2006-07-01), Hagiwara

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