Electronic offset compensation of the continuous composite track

Details Electronic offset compensation of the continuous composite track Electronic offset compensation of the continuous composite track

1991-03-05

1993-03-23

Young, Wayne R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4434, 369 4435, 369 50, 369 54, G11B 7085

Patent

active

051970589

ABSTRACT:
When doing multitrack seek or a single track jump, the midpoint between the maximum and the minimum of a tracking error signal is determined. A peak detector detects the positive peak and the negative peak. These maximum and minimum values are stored in a sample and hold circuit. A summing circuit determines the midpoint between the maximum and the minimum of the tracking error signal. An operational amplifier provides a true error signal to the servo control system that provides the appropriate servo operating point. The invention is based on the fact that even though there is no absolute reference signal indicating the appropriate on-track position, the tracking servo system obtains the track error over the whole range of positions relative to track center when doing a multitrack seek or a single track jump. The appropriate servo operating point is the midpoint between the maximum and the minimum of the track error signal. This provides compensation for level shifts due to factors such as beam displacement, or detector mispositioning, changes in read/write beam profile, and disk tilt. The present invention solves the key disadvantage of the continuous groove tracking method by eliminating tracking offsets without adding additional information to the disk. It also avoids imposing overhead on the data channel. It compensates for effects of disk tilt, detector misalignment, detector and amplifier offsets, and beam decentration due to fine tracking.

REFERENCES:
patent: 4823330 (1989-04-01), Arter et al.
patent: 4849953 (1989-07-01), Nomura et al.
patent: 5101391 (1992-03-01), Ishii et al.
patent: 5109367 (1992-04-01), Yoshikawa

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