Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1999-12-29
2000-08-29
Huber, Paul W.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
36912411, G11B 700
Patent
active
061118435
ABSTRACT:
A track zero cross signal generation apparatus for use in an optical disk system receives a tracking error signal acquired when traversing tracks on a recording medium and generates a track zero cross signal. The track zero cross signal generation apparatus includes a booster which receives the tracking error signal, low-pass-filters the received tracking error signal, and amplifies the low-pass-filtered tracking error signal having a predetermined high frequency band in a pass band for low-pass-filtering. The booster outputs the low-pass-filtered tracking error signal whose signal level in a predetermined high frequency band is amplified, to a comparator. The comparator receives the output of the booster, compares the received signal with predetermined reference voltage levels, and generates a track zero cross signal having different pulse levels when the voltage level of the received signal is larger than a predetermined first reference voltage level or when the voltage level of the received signal is smaller than a predetermined second reference voltage level. Also, the apparatus further includes a center level corrector which corrects the center level of the signal output from the booster into a zero level involved with the predetermined reference voltage levels and outputs the corrected result. The track zero cross signal generation apparatus prevents missing of the track zero cross signal in a predetermined high frequency band when an optical pickup traverses tracks on the recording medium, to thereby enable an optical pickup to accurately and quickly gain access to a target track.
REFERENCES:
patent: 5351222 (1994-09-01), Ikeda et al.
patent: 5537374 (1996-07-01), Wachi
patent: 5623464 (1997-04-01), Tani
Huber Paul W.
Samsung Electronics Co,. Ltd.
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