Apparatus and method for re-executing pre-pit detection if...

Details Apparatus and method for re-executing pre-pit detection if... Apparatus and method for re-executing pre-pit detection if...

2005-05-10

2005-05-10

Patel, Gautam R. (Department: 2655)

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Control of information signal processing channel

C369S047310, C369S053440

Reexamination Certificate

active

06891784

ABSTRACT:
An information recording/reproducing apparatus irradiates a light beam on an optical disc on which pre-pits are formed, and performs recording and/or reproduction of information with respect to the optical disc according to a recording clock produced based on a wobble signal and a pre-pit signal. When recording information onto the optical disc having the pre-pits, a light beam is radiated to thereby extract the wobble signal and pre-pit signal. Then, according to the wobble signal and the pre-pit signal, a recording clock signal is produced, and information is recorded based on the recording clock signal. When producing a pre-pit signal, a push-pull signal is produced from the reflected light from the optical disc, and this signal is compared with a reference level to thereby detect a pre-pit. Here, when a pre-pit is not detected, the reference level is changed and the detection processing of the pre-pits is executed again.

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patent: 6215742 (2001-04-01), Kuroda et al.
patent: 6687206 (2004-02-01), Masui
patent: RE38595 (2004-09-01), Kuroda et al.
patent: 800165 (1997-10-01), None
patent: 0 871 169 (1998-10-01), None

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