Automatic gain control method and apparatus in optical disk syst

Details Automatic gain control method and apparatus in optical disk syst Automatic gain control method and apparatus in optical disk syst

1990-07-03

1992-06-23

Envall, Jr., Roy N.

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

369 4436, 369 54, 369 4435, 369 43, 369111, G11B 509

Patent

active

051249677

ABSTRACT:
An amplitude difference between a reproduction signal from a preformat portion of an optical disk and a reproduction signal from a recording portion of user's data is obtained. When the amplitude difference exceeds a predetermined value, a first gain value which was set for information from the preformat portion is used as a gain value of an AGC circuit for reproduction and a gain control of the reproduction signal is performed. On the other hand, when the amplitude difference is smaller than the predetermined value, a second gain value which was set for the user's data is used. Thus, a situation such that a noise and a remaining signal of the user's data which was not erased are erroneously recognized as an inherent reproduction signal can be prevented. A discrimination to see if the data has been recorded in the recording portion of the user's data or not can be also accurately performed.

REFERENCES:
patent: 4580255 (1986-04-01), Inoue et al.
patent: 4890273 (1989-12-01), Takeuchi et al.

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