Tracking balance correction apparatus in an optical disc system

Details Tracking balance correction apparatus in an optical disc system Tracking balance correction apparatus in an optical disc system

1997-11-28

2000-02-29

Hindi, Nabil

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4435, 369 54, G11B 700

Patent

active

06031799&

ABSTRACT:
A tracking balance correction apparatus includes a pickup unit which detects a beam reflected from an optical disc and outputs a high frequency reproduction signal and diagonal summing signals, a tracking balance correction unit which receives the diagonal summing signals output from the pickup unit, adjusts phases of the received diagonal summing signals to detect a differential phase, generates and outputs the detected differential phase as a tracking error signal, an envelope detection unit which detects an envelope of the RF signal output from the pickup unit to output an envelope signal, and a digital signal processor which receives the tracking error signal from the tracking balance correction unit, generates a tracking drive voltage to set the tracking error signal to zero, and controls tracking of the pickup unit, and at the same time generates a tracking balance correction voltage according to a maximum magnitude of the envelope signal input from the envelope detection unit, to then output the generated voltage to the tracking balance correction unit.

REFERENCES:
patent: 5502698 (1996-03-01), Mochizuki
patent: 5517475 (1996-05-01), Koyama et al.
patent: 5539710 (1996-07-01), Tokushuku et al.
patent: 5761171 (1998-06-01), Tobita
patent: 5793738 (1998-08-01), Fukushima et al.
patent: 5808983 (1998-09-01), Tsutsui et al.
patent: 5808989 (1998-09-01), Ueki et al.
patent: 5875157 (1999-02-01), Sasaki et al.

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