AGC circuit with a digital divider for an optical disc drive uni

Details AGC circuit with a digital divider for an optical disc drive uni AGC circuit with a digital divider for an optical disc drive uni

1993-04-14

2000-01-18

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 54, 369 4434, G11B 7095

Patent

active

060162945

ABSTRACT:
By an output signal from a four-section detector, arithmetic is done to generate a tracking error signal TE, a focus error signal FE, and on a total light amount signal Y. The signals are submitted to time division multiplexing, and are entered as a reference voltage of a D/A converter. As a digital input of the D/A converter, data DB from a reciprocal table is supplied. The DB is a reciprocal of the data DA which is a digitalized total light amount signal Y. In the D/A converter, the error signal and data DB are multiplied together so as to generate an error signals of which amplitude is constant against variation in laser power. By the error signal, a servo drive signal is generated in a signal processing circuit.

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