Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1997-02-25
1998-04-28
Hindi, Nabil
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369 4429, G11B 700
Patent
active
057454698
ABSTRACT:
A preamplifier for an optical disc system. The preamplifier is based on an automatic gain control (AGC) system for obtaining a constant response and a stable output signal for input signals of a certain amplitude. The preamplifier includes a radio frequency amplifier for amplifying an output signal from the pick-up unit, an AGC unit for amplifying an output signal from the radio frequency amplifier to a desired level, an AGC detector unit coupled at its input terminal to an output terminal of the AGC unit and at its output terminal to an input terminal of the AGC unit. The AGC detector unit serves to rectify an output signal from the AGC unit, compare the rectified signal with a reference signal having a predetermined level, and send the resultant signal obtained by the comparison to the AGC unit. A mode selecting unit is coupled to the AGC detector unit and adapted to select one of several modes of operation, respectively corresponding to different equalization characteristics.
REFERENCES:
patent: 5436771 (1995-07-01), Yun
Kim Chun-sup
Kim Yong-Serk
Hindi Nabil
Samsung Electronics Co,. Ltd.
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