Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reexamination Certificate
2006-08-22
2006-08-22
Edun, Muhammad (Department: 2627)
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
C369S044290, C369S124010, C369S044340, C369S047460
Reexamination Certificate
active
07095681
ABSTRACT:
An apparatus and method for detecting a wobble signal read from an optical disc. The wobble signal detection apparatus comprises an analog/digital (A/D) converter for A/D-converting an analog wobble signal, read from the optical disc and then band pass filtered, a slope detector for detecting a slope of the A/D-converted wobble signal according to a variation thereof, and a wobble signal detector for detecting a peak point of the A/D-converted wobble signal using the detected wobble signal slope, and detecting/outputting a square-wave wobble signal with a high level or low level transition at the detected peak point. The slope detector calculates variations of data values of the A/D-converted wobble signal sampled within a predetermined period on the basis of predetermined different weights, accumulates the calculated values and detects the slope of the A/D-converted wobble signal on the basis of the accumulated value. The predetermined period is an interval where at least two wobble signal data samples are obtained. Therefore, a stable wobble signal can be detected even though a low-frequency fluctuation component and DC offset component are introduced into the analog wobble signal read from the optical disc or the analog wobble signal varies in amplitude.
REFERENCES:
patent: 5646932 (1997-07-01), Kuribayashi et al.
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patent: 6621779 (2003-09-01), Inokuchi et al.
patent: 6809997 (2004-10-01), Park et al.
Joo Won Bae
Park Jung-Bae
Suh Sang Woon
Edun Muhammad
LG Electronics Inc.
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