Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1994-08-29
1996-09-24
Young, W. R.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 44360, 369 44250, G11B 7095
Patent
active
055597700
ABSTRACT:
In an automatic gain control device, an error signal generated based on output signals from a divided sensor is inputted to an operational amplifier. A sum signal of the output signals from the divided sensor is inputted to a multiplier. The error signal is divided by the sum signal by negatively feeding back an output signal from the operational amplifier to the operational amplifier via the multiplier. Two predetermined voltages are alternately applied to the multiplier in a state in which the sum signal is 0. The amplitudes of output signals from the automatic gain control device corresponding to the two voltages are detected. Input offsets of the operational amplifier and the multiplier are cancelled by calculating the input offsets of the operational amplifier and the multiplier on the basis of the detected amplitudes of the signals, the two predetermined voltages, and a gain of the multiplier.
REFERENCES:
patent: 4858214 (1989-08-01), Baba
patent: 4955011 (1990-09-01), Baba
patent: 4977551 (1990-12-01), Minami et al.
patent: 5109367 (1992-04-01), Yoshikawa
Baba Hisatoshi
Hiroki Tomoyuki
Canon Kabushiki Kaisha
Tran Thang V.
Young W. R.
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