Waveform controlling device for a tracking error signal

Details Waveform controlling device for a tracking error signal Waveform controlling device for a tracking error signal

1996-12-20

1999-07-20

Trammell, James P.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4411, 369 4423, 369 4426, 369 4428, 369 4429, 369 4432, 369 4435, 702 66, G11B 7085

Patent

active

059264454

ABSTRACT:
An unbalanced waveform of a tracking error signal is automatically corrected within a short period of time. A peak value and a bottom value of a tracking error signal are obtained by a peak-hold circuit and a bottom-hold circuit, respectively. Based on the peak value and the bottom value, an amount of offset measured from a reference level and an amplitude of the tracking error signal are computed. An adjustment value is computed for correcting the unbalance between the peak value and the bottom value based on the amount of offset and the amplitude of the tracking error signal. The adjustment value is fed back to a tracking balance circuit so that the waveform of the unbalanced waveform of the tracking error signal is corrected.

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