Method of detecting land pre-pit signal and optical disc player

Details Method of detecting land pre-pit signal and optical disc player Method of detecting land pre-pit signal and optical disc player

2007-09-11

2007-09-11

Hindi, Nabil (Department: 2627)

Dynamic information storage or retrieval

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Control of information signal processing channel

C369S044130

Reexamination Certificate

active

10918426

ABSTRACT:
The method of the present invention is capable of securely detecting LPP signals. The method comprises the steps of: reading a push-pull signal including a wobble component and LPP components; and slice-shaping the push-pull signal with a slice signal so as to binarize the LPP components and detect the LPP signals. The method is characterized by: detecting pulse widths of the LPP signals with changing voltage of the slice signal; calculating degree of dispersion of the pulse widths of the LPP signals; stopping the change of the voltage of the slice signal when the degree of dispersion exceeds a predetermined threshold value; and correcting the voltage of the slice signal on the basis of a predetermined correction value.

REFERENCES:
patent: 7197001 (2007-03-01), Hsu
patent: 2003-123260 (2003-04-01), None

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